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THE
CONFERENCE 2021
INFORMATION
AND
ABSTRACTS
Contents
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Welcome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Schedule of the conference . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Who are the organizers? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Note to online participants . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Zoom coordinates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mini courses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Goulnara Arzhantseva . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Jesse Peterson . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Christopher Schafhauser . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Panel Discusssions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Contributed talks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3 Minute talks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Information for in person participants . . . . . . . . . . . . . . . . . . . . 29
Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Covid restrictions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Public transportation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Reception . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Conference dinner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Excursions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Places to eat in Münster . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Practical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2
General information
Welcome
We are glad to welcome you to the Young Mathematicians in C∗ -Algebras con-
ference 2021, hosted in WWU Münster! Due to the pandemic, this year’s event
will take on a hybrid format. This booklet contains information for both online
and in person participants of the conference.
Schedule of the conference
YMC*A 2021 takes place over the span of two weeks: August 2-6 (afternoons)
and August 9-13 (mornings). As we expect to have participants joining from
many different time zones, we have tried to make the conference accessible to
as many as possible.
YMC*A 2021 features the following events:
• Mini courses given by Goulnara Arzhantseva, Jesse Peterson and Christo-
pher Schafhauser.
• Panel discussions on advice for early career researchers in operator al-
gebras.
• Contributed talks given by participating speakers.
• Sessions of 3-minute poster talks given by participants.
The following tables include the detailed schedule of this year’s event. The
red colored cells indicate minicourse sessions, while the green ones indicate
contributed talks.
3
Week 1
Week 1: August 2 - August 6
Time in CEST Monday Tuesday Wednesday Thursday Friday
Jesse Christopher Christopher Jesse
14:00-14:30
Peterson Schafhauser Schafhauser Peterson
Jesse Christopher Christopher Jesse
14:30-15:00 Lucas Hall
Peterson Schafhauser Schafhauser Peterson
Jonathan Kevin Alistair
15:00-15:30 Apurva Seth Ali Raad
Turk Aguyar Brix Miller
Andrea
15:30-16:00 break break break break
Vaccaro
Srivatsav Kunna- Jesse Jesse
16:00-16:30 break Xin Ma
walkam Elayavalli Peterson Peterson
Jesse Jesse
16:30-17:00 Daniel Drimbe panel Dan Ursu
Peterson Peterson
17:00-17:30 posters Sayan Das panel Konrad Wróbel
17:30-18:00 posters Krishnendu Khan panel Ishan
Week 2
Week 2: August 9 - August 13
Time in CEST Monday Tuesday Wednesday Thursday Friday
Goulnara Goulnara Goulnara Goulnara
09:00-09:30 Emily Korfanty
Arzhantseva Arzhantseva Arzhantseva Arzhantseva
Goulnara Goulnara Andrew Goulnara Goulnara
09:30-10:00
Arzhantseva Arzhantseva Mcdowell Stocker Arzhantseva Arzhantseva
Samantha
10:00-10:30 Marzieh Forough Paul Herstedt Bram Verjans Alonso Delfín
Pilgrim
10:30-11:00 break break break break break
Christopher Christopher Roberto Hernan-
11:00-11:30 Mario Klisse panel
Schafhauser Schafhauser dez Palomares
Christopher Christopher Priyanga
11:30-12:00 Lise Wouters panel
Schafhauser Schafhauser Ganesan
Matthew J Devarshi
12:00-12:30 Anshu panel
Ferrier Mukherjee
Sergio Gi-
12:30-13:00 posters Jan Gundelach
ron Pacheco
4Who are the organizers?
This year’s event is organized by the postdocs and PhD students of the Opera-
tor Algebras team in WWU Münster, namely
• Becky Armstrong
• Kristin Courtney
• Antje Dabeler
• Samuel Evington
• Eusebio Gardella
• Shirly Geffen
• Rafaela Gesing
• Grigoris Kopsacheilis
• Julian Kranz
• Omar Mohsen
• Petr Naryshkin
• Shintaro Nishikawa
• Federico Vigolo
• Jeroen Winkel
If you have any question or need any help, do not hesitate to contact any of the
organizers. We can all be reached at
ymcstara@gmail.com
or individually; our contact information is included in YMC*A’s website. Either
in person or virtually, many of us will be around at all times.
5Note to online participants
It is unfortunate that we cannot all be together in person in this year’s confer-
ence. Besides learning and presenting one’s work, YMC*A is also about social-
izing and meeting the people that are joining or already working in the field of
operator algebras.
If you are participating online, please try to take this opportunity and em-
brace the social aspect of YMC*A. It would be particularly nice for people to
keep their webcams on during the event, join the break-out rooms and engage
in conversations with their fellow participants.
Zoom coordinates
The platform that is going to be used for virtual participation is Zoom. We
ask our remote participants to connect to the conference using the names that
they registered with, so that we can prevent any malicious parties from joining.
The Zoom coordinates will be announced via email on July 30. If you wish to
receive the coordinates after July 30, please email ymcstara@gmail.com.
6Mini courses
The conference features three mini courses, each of which consists of 4 lec-
tures. These will be given by Goulnara Arzhantseva (University of Vienna),
Christopher Schafhauser (University of Nebraska) and Jesse Peterson (Vander-
bilt University). You can find their abstracts in the following pages.
Goulnara Arzhantseva
Constructions of non C∗ -exact groups
A countable discrete group G is C∗ -exact or simply, exact, if its reduced C∗ -
algebra C r∗ (G) is an exact C∗ -algebra (i.e. if taking the minimal tensor product
with C r∗ (G) preserves short exact sequences of C∗ -algebras). Equivalently, G is
exact if it admits an amenable action on some compact Hausdorff space. Ex-
act groups are also said to be boundary amenable, amenable at infinity, to have
Guoliang Yu’s property A or to be coarsely amenable. The exactness is viewed
as a weak amenability type condition. All amenable groups, linear groups,
Gromov’s hyperbolic groups, groups with finite asymptotic dimension, and
many other familiar groups are known to be exact. In contrast, constructions
of non-exact groups are rare and technically quite involved. We will discuss
such constructions, indicate applications, and suggest some open problems.
7Jesse Peterson
Von Neumann algebras and lattices in higher-rank groups
Lecture 1: Background on von Neumann algebras. We’ll briskly review basic
properties of semi-finite von Neumann algebras. The standard representation,
completely positive maps, group von Neumann algebras, the group-measure
space construction, and some characterizations of the hyperfinite II1 factor.
Lecture 2: Some approximation properties. We discuss some approximation
properties that are common in "rank 1" groups: Weak amenability and biex-
actness.
Lecture 3: Proper proximality We discuss properly proximal groups as defined
by Boutonnet, Ioana, and myself, and give some applications to group von
Neumann algebras associated to higher-rank groups.
m Lecture 4: Von Neumann equivalence. We’ll introduce measure equivalence
(ME), W∗ -equivalence (W∗ E), and von Neumann equivalence (VNE). We’ll give
examples and discuss invariants.
8Christopher Schafhauser
On the classification of simple nuclear C∗ -algebras
A conjecture of George Elliott dating back to the early 1990’s asks if separable,
simple, nuclear C∗ -algebras are determined up to isomorphism by their K -
theoretic and tracial data. Restricting to purely infinite algebras, this is the fa-
mous Kirchberg-Phillips Theorem. The stably finite setting proved to be much
more subtle and has been a driving force in research in C∗ -algebras over the
last 30 years. A series of breakthroughs were made in 2015 through the classi-
fication results of Elliott, Gong, Lin, and Niu and the quasidiagonality theorem
of Tikuisis, White, and Winter. Today, the classification conjecture is now a the-
orem under two additional regularity assumptions: Z -stability and the UCT.
In my recent joint work with José Carrión, Jamie Gabe, Aaron Tikuisis, and Stu-
art White a much shorter and more conceptual proof of the classification the-
orem in the stably finite setting was provided. I hope to give an overview of the
classification problem for C∗ -algebras and discuss some of the new techniques
that led to the new proof.
9Panel Discusssions
On each Wednesday, we will host a panel consisting of senior mathematicians
from around the world (both from academia and industry) who will address
common topics such as applying for jobs, giving talks, submitting papers, nav-
igating a career in and out of academia, etc. The panels are as follows:
• Week 1
- Nate Brown (Penn State University)
- Alcides Buss (Federal University of Santa Catarina)
- Marcelo Laca (University of Victoria)
- David Penneys (Ohio State University)
- Thomas Timmerman (Codecentric)
- Lyudmila Turowska (Chalmers University of Technology, Gothenburg)
- Gouliang Yu (Texas A&M University)
• Week 2
- Bernard Okello (Jaramogi Oginga Odinga University of Science and
Technology)
- Narutaka Ozawa (Kyoto University)
- Jacqui Ramagge (Durham University)
- Prahlad Vaidyanathan (Indian Institute of Science Education and Re-
search Bhopal)
- Sam Webster (Independent Hospital Pricing Authority)
- Stuart White (Oxford University)
10Contributed talks
In this section you will find the titles and abstracts of the 20-minute contributed
talks appearing in this year’s YMC*A.
Anshu
Connected stable rank of C∗ -algebras
The goal of this talk is to discuss the connected stable rank of a C∗ -algebra.
The notion of connected stable rank was introduced by Marc Rieffel in the
pursuit of understanding the stability properties of C∗ -algebras. In the first
part of the talk, we will define the connected stable rank and will discuss some
basic examples. We will also discuss the relationship between the connected
stable rank of a C∗ -algebra A and its K -theory. Then we will move on to give
brief descriptions of a C (X )-algebra and a crossed product C∗ -algebra by a fi-
nite group. In the later part of the talk, we will provide estimates of connected
stable rank for upper semicontinuous C (X )-algebras and crossed product C∗ -
algebras by finite groups. We will also prove that if A has connected stable rank
one, then the crossed product C∗ -algebra by an action with the Rokhlin prop-
erty also has connected stable rank one.
Kevin Aguyar Brix
C∗ -algebras from symbolic dynamical systems
Cuntz–Krieger algebras are constructed from symbolic dynamical systems of
finite type (finite graphs) and they provided the first large class of simple and
purely infinite C∗ -algebras. This was the inspiration for the rich and diverse
(yet tangable) class of graph C∗ -algebras. In this talk, I will advertise a different
generalisation of Cuntz–Krieger algebras constructed from general symbolic
dynamical systems. These C∗ -algebras are still not completely understood but
11I will indicate how their fine structure allows us to infer properties of the un-
derlying dynamics.
Sayan Das
On the free group factor problem, and Popa’s MV-property
One of the most important outstanding problems in von Neumann algebras
asks if the group von Neumann algebra of the free group on two generators,
denoted by L(F2 ), is isomorphic to the group von Neumann algebra of the free
group on infinitely many generators, denoted by L(F∞ ). Recently, S. Popa es-
tablished a roadmap for showing the nonisomorphism of L(F2 ) and L(F∞ ). The
first step of the proposed roadmap is to establish the so called mean value
property (abbreviated MV-property) for L(F2 ).
In this talk I shall describe the proof of the result that L(F2 ) has the MV-
property, thereby establishing the first step of Popa’s roadmap. This talk is
based on a recent joint work with Prof. Jesse Peterson.
Alonso Delfín
C∗ -like modules over L p operator algebras
In this talk, we describe a new general characterization for Hilbert modules
over C∗ -algebras. Motivated by this characterization, we introduce the con-
cept of C∗ -like modules over L p operator algebras and present several exam-
ples. For some particular C∗ -like modules (X , Y ), we associate an L p operator
algebra O p (X , Y ) via a Fock space construction. The way we define O p (X , Y ) is
an analogue of the Cuntz-Pimsner construction for C∗ -correspondences. Even
though this is still a work in progress, we believe that it could yield an interest-
ing class of L p operator algebras. In fact, we show that if d ∈ Z≥2 , p ∈ (1, ∞),
p q
and q is its Hölder conjugate, then the pair (`d , `d ) is a C∗ -like module over C
p q p
and O p (`d , `d ) is isometrically isomorphic to O d the L p -version of the Cuntz
algebra introduced by N.C. Phillips back in 2012.
12Daniel Drimbe
New examples of W∗ and C∗ -superrigid groups
A group G is called W∗ -superrigid (resp. C∗ -superrigid) if it is completely "re-
membered" by its von Neumann algebra (resp. its reduced C∗ -algebra).
An important, but challenging problem in operator algebras is to produce
new examples of such groups since it clarifies the classification of these ob-
jects. Although this problem goes back to the pioneers of the field, currently
only a few classes of W∗ -superrigid and C∗ -superrigid groups are known in the
literature.
The goal of this talk is to present new constructions of W∗ and C∗ -superrigid
groups arising from various natural constructions in group theory including
direct products, amalgamated free products, HNN extensions, wreath prod-
ucts and coinduced groups. The proofs of these results are based on Popa’s
deformation/rigidity theory along with a natural interplay with C∗ -algebraic
techniques such as the unique trace property and the absence of nontrivial
projections. This is based on a very recent joint work with Ionut Chifan and
Alec Diaz-Arias.
Srivatsav Kunnawalkam Elayavalli
Proper proximality for groups acting on trees
We will discuss new joint work with Changying Ding, wherein we find new ex-
amples of properly proximal groups. This property was introduced by Boutonnet-
Ioana-Peterson in 2018, and is a very flexible dynamical property that has di-
rect consequences to Cartan rigidity at the von Neumann algebra level. We
show that a family of groups acting on trees naturally fits into this framework.
Time permitting, I will also describe a complete classification result of proper
proximality among graph products of groups.
13Matthew J Ferrier
Morita equivalence of C∗ -categories
Morita equivalence for C∗ -algebras was developed by Marc Rieffel in the 1970’s.
It’s possible to view this as an extension of the algebraic notion for rings, so far
as two C∗ -algebras are Morita equivalent if their categories of Hilbert modules
are equivalent, and the functors implementing the equivalence must satisfy
some additional mild conditions.
C∗ -categories are a naturally occurring generalisation of C∗ -algebras, with
examples including the category of Hilbert modules over a C∗ -algebra. In this
talk we will take a look at the basics of C∗ -categories, and see how we can ex-
tend Rieffel’s notion of Morita equivalence to this setting. Hopefully we will
also have time to see how this notion fits in with other constructions first made
by Michael Joachim.
Marzieh Forough
Lifts of completely positive equivariant maps
In this talk, I will first give a brief introduction to the lifting problem for com-
pletely positive maps between C∗ -algebras. In particular, the Choi-Effros lift-
ing theorem and some of its consequences in the theory of C∗ -algebras will be
explained. Motivated by the wide range applications of this celebrated lifting
theorem and the recent increased interests in the structure of C∗ -dynamical
systems, it is natural to look for an equivariant version of the lifting result for
completely positive maps. I will address this problem, more precisely, discuss
the following equivariant result: Let G be a locally compact second countable
group, A and B be G-algebras and let I be a G-invariant ideal of B . Then every
completely positive contractive map from A into B /I admits asymptotically
equivariant lifts.
This talk is based on joint work with Eusebio Gardella and Klaus Thomsen.
14Priyanga Ganesan
Quantum graphs
Quantum graphs are an operator space generalization of classical graphs. In
this talk, I will present the different notions of quantum graphs that arise in
operator systems theory, non-commutative topology and quantum informa-
tion theory. I will then introduce a non-local game with quantum inputs and
classical outputs, that generalizes the graph homomorphism game for clas-
sical graphs. This is based on joint work with Michael Brannan and Samuel
Harris.
Jan Gundelach
Leavitt path algebras as Cohn localisations
A directed graph E = (E 0 ; E 1 ; s, r : E 1 → E 0 ) offers the framework to construct
an associated graph C∗ -algebra that is designed to model vertices as orthog-
onal projections and edges as associated partial isometries with well-behaved
range and source projections. If one drops the analytic aspect of completion
in a C∗ -norm to restrict attention to the involved ∗-algebraic Cuntz-Krieger
relations, this modelling provides Leavitt path algebras instead.
The key observation I want to highlight in this talk is that the Cuntz-Krieger
relations for relative Leavitt path algebras L can be equivalently posed as in-
vertibility postulations for path prolongation maps over some path algebra B .
This justifies to treat them as Cohn localised path algebras L = Cohn(B ). Now,
compatibility of quasi-freeness and Cohn localisation allows to effectively re-
duce the computation of differential forms for L to the conceptually easier
path algebra B . In the end we obtain a projective bimodule resolution of length
one for L without much theory which can be used as a tool for further homo-
logical computations.
15Lucas Hall
Coactions and skew products for topological quivers
Since their introduction at the turn of the century, graph algebras have shed
new light on the field of C∗ -algebras by allowing one to investigate algebraic
structure in terms of a combinatorial picture. Among other things, this lens
provided a new perspective for the study of nonabelian duality through the
construction of skew product graphs, yielding “coactions you can see.”
Here, we investigate skew products for topological quivers, a vast general-
ization to directed graphs which allow for topological data and flexible range
and source maps. We show that, as in the discrete case, the algebra associated
to a skew product is related to a crossed product by a coaction. In this context,
the coaction is nice enough that the dual action is amenable in an appropriate
sense.
Paul Herstedt
AT-algebras associated to zero-dimensional systems
We introduce a new class of zero-dimensional dynamical systems, which we
call "fiberwise essentially minimal", whose crossed product is guaranteed to
be an AT-algebra. Under the assumption that these systems also have no peri-
odic points, the crossed product also has real rank zero, and is hence classifi-
able. This work extends the results of the minimal case (Putnam ’90) and the
essentially minimal case (Herman, Putnam, Skau ’95) to classify a larger class
of (non-simple) crossed products obtained from zero-dimensional dynamical
systems.
16Ishan
Von Neumann equivalence and group approximation properties
The notion of measure equivalence of groups was introduced by Gromov as the
measurable counterpart to the topological notion of quasi-isometry. Another
well-studied notion is that of W∗ -equivalence which states that two groups Γ
and Λ are W∗ -equivalent if they have isomorphic group von Neumann alge-
bras, i.e., LΓ ' LΛ. We introduce a coarser equivalence, which we call von
Neumann equivalence, and show that it encapsulates both measure equiva-
lence and W∗ -equivalence. We will also discuss the stability of many group
approximation properties under von Neumann equivalence, particularly, that
of the new and a wide class of groups called properly proximal groups, intro-
duced by Rémi Boutonnet, Adrian Ioana, and Jesse Peterson, and thereby ob-
taining first examples of non-inner-amenable, non-properly proximal groups.
This is based on joint work with Jesse Peterson and Lauren Ruth.
Krishnendu Khan
Fundamental group of certain property (T) factors
Calculation of fundamental group of type II1 factor is, in general, an extremely
hard and central problem in the field of von Neumann algebras. In this direc-
tion, a conjecture due to A. Connes states that the fundamental group of the
group von Neumann algebra associated to any icc property (T) group is triv-
ial. Up to now there was no single example of property (T) factor satisfying the
conjecture. In this talk, I shall provide the first examples of property (T) group
factors (arising from group theoretic constructions) with trivial fundamental
group. This talk is based on a joint work with Ionut Chifan, Sayan Das and
Cyril Houdayer.
17Mario Klisse
A C∗ -dynamical approach to the simplicity of Hecke C∗ -algebras
(Iwahori) Hecke algebras are deformations of the group algebras of Coxeter
groups depending on a deformation parameter. They can be naturally rep-
resented on the `2 -space of the corresponding group and thus complete to
C∗ -algebras. The aim of this talk is to discuss certain topological boundaries
associated with (Cayley graphs of ) Coxeter systems. These boundaries reflect
combinatorial and order theoretic properties of the underlying group and are
closely related to the Hecke C∗ -algebras of the system. The exploitation of
their (dynamical) properties allows to answer the question for the simplicity of
right-angled Hecke C∗ -algebras. I will explain the idea behind this approach.
Emily Korfanty
Étale equivalence relations and C∗ -algebras for iterated function systems
The iteration of a collection of contractive maps on a closed subset of Eu-
clidean space can produce geometrically interesting self-similar sets, or frac-
tals. These collections are called iterated function systems. Many classic self-
similar sets, such as the Siérpinski Gasket, can be constructed from a collection
of affine maps differing only by translations. Moreover, a groupoid C∗ -algebra
construction has yet to be provided for many standard iterated function sys-
tems of this type. In this talk, we will introduce étale equivalence relations
for this broad class of iterated function systems, and discuss the associated
groupoid C∗ -algebras, with a focus on the Siérpinski Gasket as an example.
18Xin Ma
Fiberwise amenability and almost elementariness for Hausdorff étale
groupoids
In this talk, I will discuss two new properties for locally compact Hausdorff
étale groupoids. One is from a coarse geometric view called fiberwise amenabil-
ity as a new generalization of amenability for discrete groups. Another one
from the dynamical view is called almost elementariness, which is a general-
ization of the concept of almost finiteness introduced by Matui and refined by
Kerr. I will show our almost elementariness implying tracial Z -stability of re-
duced groupoid C∗ -algebras if the groupoid is minimal and 2nd countable. As
an application, Matui’s almost finiteness in the groupoid setting also implies
Z -stability of reduced groupoid C∗ -algebras when the groupoid is minimal,
2nd countable and topological amenable. This was open in general before. I
will also present more applications if time permits. This is based on joint work
with Jianchao Wu.
Alistair Miller
Groupoid correspondences and the ABC spectral sequence
Étale groupoids provide a rich source of examples of C∗ -algebras via the groupo-
id C∗ -algebra construction. To view this construction and related construc-
tions as functorial, we need a notion of groupoid morphism that induces an
analogue for the C∗ -algebras. Groupoid correspondences induce C∗ -correspon-
dences, which are a type of morphism of C∗ -algebras useful in K-theory.
One particular construction we are interested in is the ABC spectral se-
quence, which V. Proietti and M. Yamashita studied in the context of a torsion-
free ample groupoid. We can make the construction of the spectral sequence
functorial with respect to certain groupoid correspondences, and we sketch an
application of this.
19Devarshi Mukherjee
Cyclic homology and non-commutative geometry in positive characteristic
The notion of a smooth subalgebra of a C∗ -algebra - analogous to the algebra
of smooth functions on a manifold C ∞ (M ) embedded inside the algebra of
continuous functions C (M ) - is a key insight in defining well-behaved invari-
ants for C∗ -algebras. In this talk, I will explain how similar ideas can be used
to study non-commutative algebras and their invariants when the underlying
field has positive characteristic. The examples of non-commutative algebras
that we are interested in are suitable analogues of crossed product algebras
and Leavitt path algebras. Finally, I will discuss the computation of analytic
cyclic homology for a Leavitt path algebra of a countable graph, showing that
our result recovers expected and known results from characteristic zero. Parts
of this talk is based on joint work with Guillermo Cortinas and Ralf Meyer.
Sergio Giron Pacheco
Symmetries of simple operator algebras
In this talk I will start by giving an elementary introduction to the symme-
tries of the Hyperfinite II1 factor R. I will shortly discuss classification re-
sults of these by Connes, Jones, Ocneanu and Popa. I will then discuss how
the existence of these symmetries carry over to a particularly nice class of C∗ -
algebras, those classified by the Elliott programme. In fact, it is known that any
countable discrete group G acts faithfully on any classifiable C∗ -algebra. How-
ever, even for types of quantum symmetries closely related to group actions
(anomalous symmetries) the existence question is subtle and it can have both
positive and negative answers. This talk is based on joint work with Samuel
Evington.
20Roberto Hernandez Palomares
Q-system completion for C∗ -algebras
We will focus on the C∗ 2-category C∗ Alg with objects unital C∗ -algebras, 1-
morphisms right C∗ Hilbert correspondences, and 2-morphisms adjointable
intertwiners.
Q-systems were introduced by Longo to describe the canonical endomor-
phism of a finite index inclusion of infinite von Neumann factors N ⊂ M . Q-
systems in C∗ Alg characterize finite Watatani index extensions of a unital C∗ -
algebra B ⊂ A equipped with a faithful conditional expectation E B : A → B .
Following work of Douglass-Reutter, a Q-system is also a unitary version of a
higher idempotent, and Q-system completion is a unitary version of a higher
idempotent completion for C∗ 2-categories.
We will show C∗ Alg is Q-system complete, i.e., Q-system completion is a
∗
-2-equivalence. We prove this by constructing an inverse ∗ -2-functor called
realization which turns Q-systems back into unital C∗ -algebras. These tech-
niques allow for the straightforward adaptation of subfactor techniques to study-
ing actions of unitary tensor categories on C∗ -algebras.
This is joint work of Quan Chen, Roberto Hernandez Palomares, Corey
Jones, and David Penneys.
Samantha Pilgrim
Isometric actions and finite approximations
We demonstrate relationships between group actions which fix metrics and
those which admit certain finite approximations (definitions and some ele-
mentary theory of such approximations for group actions will also be explained).
In particular we show that every isometric action on a Cantor set is conjugate
to an inverse limit of actions on finite sets; and that every translation action
by a finitely-generated, amenable subgroup of a compact group is residually
finite. We also discuss the implications for C∗ -algebras arising from such ac-
tions, proving in a more direct way than previously known that crossed prod-
ucts of the translation actions mentioned earlier are quasi-diagonal.
21Ali Raad
Existence and uniqueness of inductive limit Cartan subalgebras in
inductive limit C∗ -algebras
Cartan subalgebras of C∗ -algebras have been pivotal in connecting C∗ -algebras
to topological dynamics and geometric group theory. They have also featured
in the UCT Problem, which has reductions in terms of whether certain C∗ -
algebras contain Cartan subalgebras. Hence, the question of existence and
uniqueness of Cartan subalgebras in C∗ -algebras has received a lot of atten-
tion recently. One particular class of interest is in AX-algebras, which are cer-
tain inductive limit C∗ -algebras.
In this talk I wish to introduce this class and the notion of a Cartan subal-
gebra, and specifically an inductive limit Cartan subalgebra. AF-algebras are
a great example of an instance in which we find unique inductive limit Cartan
subalgebras, due to a construction by Stratila and Voiculescu in 1975. I wish to
present one of the results of my PhD, which answers this existence and unique-
ness question for AI and AT-algebras, as well as for general AX-algebras under
certain conditions on X.
Apurva Seth
AF-algebras and rational homotopy theory
In this talk, we give a procedure to compute the rational homotopy groups of
the group of quasi-unitaries of an AF-algebra. As an application, we show that
an AF-algebra is K-stable if and only if it is rationally K-stable.
22Andrew Mcdowell Stocker
C∗ -algebras of expansive dynamical systems
This work builds on the work done by Klaus Thomsen towards generalizing the
Smale space methods developed by Putnam and Ruelle to the setting of expan-
sive dynamical systems. We will present a class of dynamical systems called
synchronizing systems which are expansive and generalize Smale spaces, and
we will show that this class of dynamical systems generalizes Smale spaces but
is still amenable to the techniques of Putnam and Ruelle. No knowledge of dy-
namical systems will be assumed for this talk.
Jonathan Turk
Prime order subgroup correspondences
If H is a closed subgroup of a locally compact group G, we may associate a
C∗ -correspondence to the pair (H ,G). When G is finite and H has order 2,
the Cuntz-Pimsner algebra of this correspondence only depends on how the
canonical action of H on G/H partitions G/H into orbits. In many cases, K-
theory, Mackey’s Subgroup Theorem, and the theory of graph algebras may be
used to identify the Cuntz-Pimsner algebra up to isomorphism. The first half
of the talk will be an introduction to C∗ -correspondences and will demonstrate
how they’re used to induce a representation from one group to another. This
introduction will also include a light description of the Cuntz-Pimsner algebra
of a C∗ -correspondence without going through the heavy details. The second
half of the talk will give more insight into the techniques used to identify cer-
tain Cuntz-Pimsner algebras. The talk will end by discussing the speaker’s re-
search aiming to apply these techniques to the more general setting where G
is finite and the order of H is an arbitrary prime.
23Dan Ursu
The ideal intersection property for essential groupoid C∗ -algebras
Groupoids give a very large class of examples of C∗ -algebras. For example, it
is known that every classifiable C∗ -algebra arises as the reduced C∗ -algebra of
some twisted groupoid.
In joint work with Matthew Kennedy, Se-Jin Kim, Xin Li, and Sven Raum,
we fully characterize when the essential C∗ -algebra of an étale groupoid G with
locally compact unit space has the ideal intersection property. This is done in
terms of the dynamics of G on the space of subgroups of the isotropy groups
of G . The essential and reduced C∗ -algebras coincide in the case of Haus-
dorff groupoids, and the ideal intersection property is the same as simplicity
in the case of minimal groupoids. This generalizes the case of the reduced
crossed product C (X ) or G done by Kawabe, which in turn generalizes the case
of the reduced C∗ algebra C r∗ (G) of a discrete group done by Breuillard, Kalan-
tar, Kennedy, and Ozawa.
No prior knowledge of groupoids will be required for this talk.
Andrea Vaccaro
Games on AF-algebras
In the framework of continuous model theory, two C∗ -algebras A and B are
said to be elementarily equivalent if they have the same first order theory. This
concretely implies, for instance, that any property which can be expressed as
inf / sup max{Q 1 (x), . . . ,Q k (X )} = 0,
kxk≤1
where each Q j (x) is a ∗ -polynomial, is satisfied by A if and only if it is satisfied
by B . When restricting to the class of UHF algebras, elementary equivalence
is the same as isomorphism. This is known to be false for AF-algebras, but
finding concrete examples of AF-algebras which are elementarily equivalent
but not isomorphic is not immediate (the only examples known until now were
all abelian).
24The isomorphism class of an AF-algebra is completely determined by its
dimension group, K 0 (A). Similarly, we show that the theory of K 0 (A), as an
abelian ordered group, determines to some extent the theory of A. This per-
mits to reduce the study of elementary equivalence on C∗ -algebras to the study
of elementary equivalence on abelian ordered groups, allowing to find a large
class of pairwise elementarily equivalent non-isomorphic simple AF-algebras,
as well as simple AF-algebras of arbitrarily high Scott’s rank. This is done by
exploiting the classical characterization of elementary equivalence in terms of
Ehrenfeucht-Fraïssé games.
Bram Verjans
Bernoulli actions of type III and their von Neumann algebras
Non-singular group actions G æ (X , µ) lead to a fundamental class of exam-
ples of von Neumann algebras, through the group measure space construction
L ∞ (X ) o G. Classifying these von Neumann algebras in terms of isomorphism
of the actions is a very challenging problem. In the past two decades, Popa’s
deformation/rigidity theory has led to a lot of progress, especially in the case of
probability measure preserving actions. The classification problem for actions
of type III is much less understood. In this talk we consider a family of type
III Bernoulli actions of free product groups. We present a non-isomorphism
result of their von Neumann algebras and give examples of non-isomorphic
von Neumann algebras having the same modular invariants. This is joint work
with Stefaan Vaes.
Lise Wouters
Equivariant Jiang–Su stability for automorphisms
An action of a countable group on a C∗ -algebra is called equivariantly Z -stable
if it tensorially absorbs the trivial action on the Jiang-Su algebra. Analogous to
ordinary Z -stability, equivariant Z -stability is an important regularity prop-
erty in the context of the classification of amenable group actions on classi-
fiable C∗ -algebras. In this talk I will explain the relevance and nature of this
property and discuss for which actions positive results were already obtained
25establishing the property. In particular, I will present my own recent result: I
have proved that the property holds automatically for all automorphisms on
algebraically simple, separable, nuclear, Z -stable C∗ -algebras for which the
trace space is a Bauer simplex with finite-dimensional extremal boundary.
At least for automorphisms this is a generalization of a previous result by
Gardella-Hirshberg.
Konrad Wróbel
Orbit equivalence of wreath products
Let F be a nonabelian free group. We show that, for any two nontrivial finite
groups, the natural actions of the wreath product groups A o F and B o F , on
A F and B F respectively, are orbit equivalent. On the other hand, we show that
these actions are not even stably orbit equivalent if F is replaced with any ICC
sofic group with property (T), and A and B have different cardinalities. This is
joint work with Robin Tucker-Drob.
263 Minute talks
In this section you will find the list of the 3 minute “poster talks" appearing in
this year’s YMC*A.
Week 1
Alon Dogon,
Hilbert Schmidt stability and characters on amenable groups
Cristian Ivanescu,
Cu-nuclearity and applications
Collin Mark Joseph,
Topological Insulators
Jacek Krajczok,
On the radial subalgebra for the quantum O F+ group
Natã Machado,
Étale categories, restriction semigroups and their operator algebras
Jacob Mashburn,
Fock spaces with nearest neighbor coupling
Robert-Mihai Neagu,
On amenable and quasidiagonal traces and their behaviour under ho-
motopy
Eduardo Scarparo,
A torsion-free C∗ -unique group
27Sushil Singla,
Orthogonality, Gateaux derivative and ideals in C∗ -algebras
Joel Right Dzokou Talla,
Quantum SL(2; R) and its irreducible representations
Week 2
Maria Stella Adamo,
Standard subspaces in AQFT and beyond
Zahra Hasanpour,
Morita equivalence and partial actions
Shuler Hopkins,
Deformations of commuting squares and complex Hadamard matrices
Tomoki Uchimura,
A colimit of certain diagram in the correspondence bicategory
Amudhan Krishnaswamy Usha,
Non-spectral operators in a tracial von Neumann algebra
Gerrit Vos,
BMO spaces of sigma-finite von Neumann algebras and Fourier-Schur
multipliers on SU q (2)
28Information for in person participants
We are very glad to welcome you to the city of Münster! This part of the booklet
includes all the information you need to get around during YMC*A. We hope
you enjoy your time here!
Locations
YMC*A takes place at the mathematics department of WWU Münster, which is
located at Einsteinstraße 64. All the lectures will be given in the M1 hall of the
old flat building: just enter the main entrance and turn right at the end of the
corridor. There will also be signs inside the building to guide you to M1.
Here is a map of the area; the lecture hall is located in the Hörsaalgebäude.
© OpenStreetMap contributors
29Covid restrictions
Due to the pandemic, there are certain rules that we need to follow in order to
minimize the risk of covid-19 transmission. In particular:
Ï Participants that are attending the conference in person need to take an
antigen rapid test every 48 hours during the conference, even if they are
fully vaccinated/recovered in the last 6 months.
For rapid tests, one can either have a self-test or a test at one of the public
test sites around the city. Self-tests will be provided by the conference.
On Mondays (1:15 pm on the 1st week and 8:15 am on the 2nd week) the
organizers will demonstrate how these work. If you wish to have a free
official rapid test, you should visit
• ASB Münster, Parkplatz Schlossplatz Nord (Schlossplatz 24)
during 8 am - 8 pm on weekdays and 9 am - 12 pm on weekends. If you
visit the test site, make sure to have your ID card or passport with you.
Here is a map to help you orient:
Ï Inside the university buildings, wearing a surgical or an FFP2 mask is
mandatory1 . When seated in the M1 lecture hall during a talk, partici-
1 You can buy such masks at any drug store, pharmacy or grocery store in Münster.
30pants can take off their masks, since M1 is well ventilated with a certified
system and large enough for us to keep a safe distance of 1.5 meters from
one another.
Ï If you are experiencing any respiratory symptoms (coughing, sneezing)
or fever, please refrain from participation and contact the organizers as
soon as possible to discuss how to proceed.
In case of a positive test, the general rules of the health department of
the city of Münster apply.
Besides the above rules, we encourage the participants to practice safety
measures such as avoiding handshakes, maintaining a minimum distance of
1.5 meters from others and frequently using hand sanitizer.
If you have any question regarding the above rules, please contact either
Anja Böckenholt at
anja.boeckenholt@uni-muenster.de
or Carolin Gietz at
carolin.gietz@uni-muenster.de
Public transportation
Ï Münster is also known as the "bicycle capital of Germany", the reason
being that the city is very accessible by bike; everyone uses them around
here, so renting a bike is a very convenient option to get around. Here is
a list of some bicycle rental stations, the prices vary around 10€ per day.
• Radstation Münster Hundt KG, address: Berliner Platz 27A
• Canu Camp, address: Homannstraße 64
• Hof zur Linde, address: Handorfer Werseufer 1
• Landhaus Eggert, address: Zur Haskenau 81
• Fahrrad Look, address: Dingbängerweg 249
You can find more information about these rental stations, their web-
sites and even more alternatives to these by following this link
31https://www.stadt-muenster.de/en/tourismus/bike-city/
bicycle-rental
Ï Münster’s main means of public transport is the city bus. There are many
frequent bus routes that link the inner part of the city; the maximum
waiting time is 10-20 minutes, but a lot of routes are covered by more
than one line with alternating schedules.
A single ticket (“Einzelticket”) (90 min ride on any bus line in any one
direction– no returns) costs about 2.90€, while a short route ticket (dis-
tance of 5 bus stops) costs about 1.90€. There are many alternatives to
these like 24hour tickets, or tickets for one whole week. For an interac-
tive overview of all the available tickets and the respective prices, follow
this hyperlink.
You can buy tickets for the bus from machines at central bus stops, from
the Stadtwerke service centers located at BerlinerPlatz 22, Hafenweg 1
and Salzstraße 21 (you might need to check their time schedules though),
or using the Deutschebahn App (available in English).
Keep in mind that, due to Covid-19, surgical or FFP2 masks are manda-
tory inside the city buses.
For those of you speaking German, you can also install the "Münster:app" on
your smartphone; this app helps you choose the most convenient line for your
destination, offers information on tickets etc. A non-German alternative to
this is Google maps, which offers a good deal of information on how to move
around the city.
Reception
The reception for each week will take place on Monday evening, at 7 pm. There
will be tents, benches and tables set up on the grass area behind the main
building of the mathematics department. There we will have the opportunity
to meet each other and talk over pizza, cold beer and soft drinks!
Conference dinner
There will be two conference dinners, one for each week. These will take place
on Wednesday evenings at 7pm and the cost is covered by the conference. We
32have booked the Indian restaurant Buddha Palace, which is located at Von-
Esmarch-Straße 18 (this is 10 minutes away by foot from the mathematics de-
partment). On Mondays we will distribute menus to the participants and take
your orders for the dinner.
Excursions
Below you can find a list of excursions that we have planned during YMC*A
along with a short description for each. Feel free to join any activity you like!
Week 1
Ï Aasee Brunch
Brunch with a nice view over the lake in Münster. We’ll meet on Thurs-
day at 10 am on the lawn around the Giant Pool Balls at the Aasee (see
map). Make sure to bring something to eat and drink. There are some
nice bakeries around the city center (e.g. Essmann’s Backstube, which
is very close to your hostel) and the Roestbar as well as Herr Hase make
very nice coffee. If the weather does not allow us to sit outside (i.e. if it
is raining), we will meet at Herr Sonnenschein (Königsstraße 43). In this
case you do not need to bring your own food.
Ï Macke-Exhibition at the LWL-Museum
We meet on Tuesday (Aug 3) at 10 am in front of the main entrance (fac-
ing the Cathedral) of the LWL-Museum (see map). The current exhi-
bition features the work of expressionist painters August and Elizabeth
Macke as well as a big variety of art ranging from the middle ages up to
the 21st century. The admission costs 13€. Afterwards, we will get lunch
downtown and then walk to the institute.
Email Julian (julian.kranz@uni-muenster.de) by Monday if you are
interested in participating.
Ï Double-Decker City Tour
See downtown Münster with a double-decker bus tour. From start to
finish, it lasts 50 minutes, but the ticket is valid to hop-on/hop-off all day.
The audio guide comes in German, English, Dutch, Spanish, French, and
Russian. We meet on Wednesday (Aug 4) at 11 am at the pick-up point
33on Domplatz in front of the LWL-Museum (see map). The cost is 11.50€.
Afterwards, we will get lunch at the city market and then head to the
math institute. (You are also welcome to check out the city market before
the tour.)
Email Kristin (kcourtne@uni-muenster.de) by Tuesday if you are in-
terested in participating.
The meeting points for the week 1 excursions can be found in the following
auxiliary map. The red X denotes the meeting point for the bus tour, the green
mark is for the exhibition, and the blue box points to the Giant Pool Balls where
we will meet for Brunch.
Week 2
Ï Kanal
If the weather is nice, we will go on Wednesday to the Kanal (Münster’s
closest thing to a beach). We will meet after lunch and go either by bike
34or bus. Email Eusebio at gardella@uni-muenster.de if you’re inter-
ested in joining.
Ï Macke-Exhibition at the LWL-Museum
We meet on Tuesday at 1:30 pm in front of the institute and walk down-
town to get some lunch. After lunch, we go to the LWL-Museum. The
current exhibition features the work of expressionist painters August and
Elizabeth Macke as well as a big variety of art ranging from the middle
ages up to the 21st century. The admission costs 13€.
Email Julian (julian.kranz@uni-muenster.de) by Monday if you are
interested in participating.
Of course there are many other things to do besides the above activities.
We mention only some of the alternatives below:
• City Market: On Wednesdays and Saturdays, from 7 am to 2:30 pm, one
can visit the city market of Münster, an open market set up behind St.
Paulus dom in the city centre. There you can find a large variety of food
products, fabrics, clothes and jewellery, as well as flowers and plants.
For more information on the providers and an interactive map of the
city market, you can visit the market’s web-page:
https://www.wochenmarkt-muenster.de/oeffnungszeiten
• Mühlenhof Open-Air Museum: This outdoor museum is a five-hectare
site that preserves the culture and history of the Münsterland region
from the 16th to the 19th century. On the site there are 30 buildings,
many of which are original structures from that time; on the inside, the
buildings are furnished with historical goods so that visitors get a real
impression of the Münsterland of days gone by.
The outdoor museum’s address is Theo-Breider-Weg 1 and it is open
from 10am to 6pm. An adult ticket costs 6€, while a student ticket costs
4€.
• Pablo Picasso Museum: The Pablo Picasso Münster Art Museum is Ger-
many’s first and so far only Picasso museum. The museum shows chang-
ing special exhibitions on Pablo Picasso and his fellow classical modern
artists such as Georges Braque, Henri Matisse and Marc Chagall. The
35foundation of Münster’s Picasso collection is a globally unique collec-
tion of around 800 Picasso lithographs.
The museum is located at Picassoplatz 1 and is open everyday except
Mondays from 10am to 6pm. An adult ticket costs 10€, while a student
ticket costs 8€. To visit the museum, it is necessary to book an online
ticket, which you can do by following this link:
https://kunstmuseum-picasso-muenster.de/home/
• City Fair: It is a pleasant coincidence that Münster’s city fair will be tak-
ing place at the same time as YMC*A. The fair is located in front of the
Schloss (on Schlossplatz) and can be visited every day from Monday to
Thursday, from 2pm until 10pm. There will be many fun activities to do
and things to see around there! The entrance costs only 1€ but the rides
and food will cost more, so make sure to bring some extra cash. It is nec-
essary to provide proof of covid-19 vaccination/recovery or a negative
rapid test before entering the fair and surgical/FFP2 masks need to be
worn.
• City Zoo: Münster’s “allwetterzoo" is a large zoo that accommodates
many animals from different species and different climate zones. The
zoo features a 5 km network of trails connecting the large animal houses
and is open every day from 9 am to 7 pm. An adult day ticket costs 18.90€,
while a student day ticket costs 12.90€.
The zoo is located at Sentruper Straße 315. The bus line connecting the
main station Münster Hbf to the city zoo is line 14. You can find more
information on the zoo’s website: https://www.allwetterzoo.de/
• City Tours: There are plenty of guided/thematic city tours offered in
Münster - by foot, by bike or by bus. There are also many creative city
games such as murder & mystery events, GPS rallies and much more!
Some offers from different guides can be found in the following links:
https://k3.de/en/muenster/tours
https://www.stadtlupe-muenster.de/
https://www.stattreisen-muenster.de/
36Places to eat in Münster
There are many places around Münster where you can get something to eat.
For lunch, we can recommend the following restaurants:
• Near the campus:
- Gustav Grün (Wilhelmstraße 5), vegeterian & vegan menu (takeaway).
- Áro (Neutor 3), fusion restaurant (takeaway)
- Phoenicia (Steinfurter Str. 37), Lebanese cuisine (dine-in, takeaway)
• Around the city:
-Meraki (Hansaring 69), Arabic food (dine-in, takeaway)
- Frauenstraße 24 (the name is also the address), multi-cultural cuisine
(dine-in, takeaway)
- Royals & Rice (Frauenstraße 51), Asian fusion restaurant (dine-in, take-
away)
- Beetschwester (Tibusstraße 6), vegeterian & vegan menu (dine-in, take-
away)
- Elbēn am Aasee (Scharnhorststraße 25), Syrian cuisine (dine-in, take-
away)
A popular option for lunch near the institute is the Mensa (for the location
see the map on page 29). During the first couple of days a few of the organizers
will be taking a group of people there so that anyone interested can see how
this works.
There are also many German restaurants in Münster that serve traditional
food and beer. Here are a few suggestions:
- Pinkulus (Rosenplatz 6), Westfälische cuisine
- Spatzl (Am Stadtgraben 52), Bavarian cuisine
- Altes Gasthaus Leve (Alter Steinweg 37)
- Drübbelken (Buddenstraße 14-15)
37All the restaurants in the above lists have updated web-pages and social
media that include their menus in detail. Of course, these are only some sug-
gestions and there are plenty of alternatives around Prinzipalmarkt (city-centre)
and throughout the city.
As for drinks, there are many bars in the Altstadt or at the Hafen, some of
which also feature live music every now and then. A traditional German spot
for an afternoon/ evening drink is a Biergarten. There are several around the
city. Here are a few.
- Biergarten.ms (Kastellstraße 1)
- Klamm & Heinrich (Breul 9)
- Schloss Biergarten (University of Münster, Schlossgarten 3)
We can also recommend some places for breakfast, most of which are close
to Nordstern hostel, or at least on the way from Nordstern to the mathematics
institute:
- Backhaus Jankord (Gertrudenstraße 22), bakery (takeaway)
- Essmann’s Backstude (Studtstraße 64), bakery (takeaway)
- Herr Hasse Kaffeeröster (Gertrudenstraße 19), coffee place (takeaway,
outdoor seating)
- Roestbar (Nordstraße 2), coffee place (takeaway, outdoor seating)
- Bäckerei Wilhelm Middelberg (Wilhelmstraße 1), bakery (takeaway)
38Welcome to Willkommen in
Mathematics Münster! Münster!
We have compiled some general information for Wir haben einige allgemeine Informationen für die
planning your stay at Mathematics Münster. For Planung Ihres Aufenthaltes in Münster zusammen-
more details and updates on the conference, gestellt. Für Details und Updates zur Konferenz
please visit the conference webpage or besuchen Sie bitte die Konferenz-Webseite oder
www.mathematics-muenster.de. www.mathematics-muenster.de.
Your trip to Münster Anreise nach Münster
https://www.uni-muenster.de/MathematicsMuenster/aboutmm/directions.shtml
With public transport to Mit öffentlichen Verkehrsmitteln zum
Münster (Westfalen) train station it takes about Bahnhof Münster (Westfalen) dauert es etwa
• 2.5-3.5 hours from Frankfurt Airport (FRA). • 2,5-3,5 Stunden vom Flughafen Frankfurt (FRA).
Intercity trains depart every hour, Intercity-Züge fahren stündlich,
• 1.5 hours from Düsseldorf Airport (DUS). • 1,5 Stunden vom Flughafen Düsseldorf (DUS).
Intercity trains depart every hour, Intercity-Züge fahren stündlich,
• 1-1.5 hours from Dortmund Airport (DTM) • 1-1,5 Stunden vom Flughafen Dortmund (DTM)
by hourly regional trains, mit stündlich verkehrenden Regionalzügen,
• 35 minutes from Münster Airport (FMO) • 35 Minuten vom Flughafen Münster (FMO)
by shuttle bus. mit dem Shuttlebus.
From the train station to Mathematics Münster Vom Bahnhof zum Mathematik Campus:
• 15 minutes by bus, busses for “Coesfelder • 15 Minuten mit dem Bus bis Haltestelle
Kreuz” leave every 5 minutes. „Coesfelder Kreuz“, Abfahrt alle 5 Minuten.
• 10-15 minutes by taxi. • 10-15 Minuten mit dem Taxi.
Childcare Kinderbetreuung
We gladly support parents by providing child care Gerne unterstützen wir Eltern durch Kinderbetreuung
during conferences and workshops. If you are bei Tagungen und Workshops. Wenn Sie die
planning to make use of the child care, please let Betreuung in Anspruch nehmen möchten, teilen Sie
the organizers know as soon as possible and dies und das Alter Ihrer Kinder/Ihres Kindes bitte so
inform them about the child/children’s age. bald wie möglich den OrganisatorInnen mit.
Our parent-child-rooms at the cluster (Orléans- Der Eltern-Kind-Räume im Cluster (Orléans-Ring 10,
Ring 10, ground floor) are equipped with toys, Erdgeschoss) ist mit Spielsachen, Büchern, einem
books, a baby changing facility, child-beds and for Wickeltisch, Kinderbetten und einem separaten
the parents a separate workspace. Arbeitsplatz ausgestattet.
Child care is free of charge. Die Kinderbetreuung ist kostenlos.
Wi-Fi access for guests WiFi Gast-Zugang
Connect to the SSID “GuestOnCampus” and start Verbinden Sie sich mit der SSID „GuestOnCampus“
any web browser. You will automatically be und starten Sie einen Webbrowser. Sie werden
redirected to the login page. Confirm the terms of automatisch auf die Anmeldeseite umgeleitet.
use and click on "log in for free". Bestätigen Sie die Nutzungsbedingungen und
klicken Sie auf "kostenlos einloggen". Pro Endgerät
1 GB data volume is available per device and day.
und Tag steht Ihnen 1 GB Datenvolumen zur
Please note that the connection is not encrypted.
Verfügung. Die Übertragung ist unverschlüsselt.
Mathematics Münster | Orléans-Ring 10 | 48149 Münster mathematics-muenster@uni-muenster.de
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