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BEGIN:VEVENT
SUMMARY:Allison Moore (Virginia Commonwealth University)
DTSTART:20200908T180000Z
DTEND:20200908T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/1
DESCRIPTION:Title: Triple linking and Heegaard Floer homology.\nby Alliso
n Moore (Virginia Commonwealth University) as part of Brandeis Topology Se
minar\n\n\nAbstract\nWe will describe several appearances of Milnor’s in
variants in the link Floer complex. This will include a formula that expre
sses the Milnor triple linking number in terms of the h-function. We will
also show that the triple linking number is involved in a structural prope
rty of the d-invariants of surgery on certain algebraically split links. W
e will apply the above properties toward new detection results for the Bor
romean and Whitehead links. This is joint work with Gorsky\, Lidman and Li
u.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Abdul Zalloum (Queen's University)
DTSTART:20200915T180000Z
DTEND:20200915T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/2
DESCRIPTION:Title: Regularity of Morse geodesics and growth of stable subgrou
ps\nby Abdul Zalloum (Queen's University) as part of Brandeis Topology
Seminar\n\n\nAbstract\nThe study of groups with "hyperbolic-like directio
ns" has been a central theme in geometric group theory. Two notions are us
ually used to quantify what is meant by "hyperbolic-like directions''\, th
e notion of a contracting geodesic and that of a Morse geodesic. Since the
property that every geodesic ray in metric space X is contracting or Mors
e characterizes hyperbolic spaces\, being a contracting/Morse geodesic is
considered a hyperbolic-like property. In more general spaces\, the Morse
property is strictly weaker than the contracting property. However\, if o
ne adds an additional “local-to-global” condition on X\, then Morse ge
odesics behave much like geodesics in hyperbolic spaces. Generalizing wor
k of Cannon\, I will first discuss a joint result with Eike proving that f
or any finitely generated group\, the language of contracting geodesics wi
th a fixed parameter is a regular language. I will then talk about recent
work with Cordes\, Russell and Spriano where we show that in local-to-glob
al spaces\, Morse geodesics also form a regular language\, and we give a c
haracterization of stable subgroups in terms of regular languages.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ivan Levcovitz (Technion)
DTSTART:20200922T180000Z
DTEND:20200922T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/3
DESCRIPTION:Title: Characterizing divergence in right-angled Coxeter groups\nby Ivan Levcovitz (Technion) as part of Brandeis Topology Seminar\n\n\
nAbstract\nA main goal in geometric group theory is to understand finitely
generated groups up to quasi-isometry (a coarse geometric equivalence rel
ation on Cayley graphs). Right-angled Coxeter groups (RACGs) are a well-st
udied\, wide class of groups whose coarse geometry is not well understood.
One of the few available quasi-isometry invariants known to distinguish n
on-relatively hyperbolic RACGs is the divergence function\, which roughly
measures the maximum rate that a pair of geodesic rays in a Cayley graph c
an diverge from one another. In this talk I will discuss a recent result t
hat completely classifies divergence functions in RACGs\, gives a simple m
ethod of computing them and links divergence to other known quasi-isometry
invariants.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ahmad Issa (University of British Columbia)
DTSTART:20200929T180000Z
DTEND:20200929T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/4
DESCRIPTION:by Ahmad Issa (University of British Columbia) as part of Bran
deis Topology Seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Elia Fioravante (Max Planck Institute\, Bonn)
DTSTART:20201006T180000Z
DTEND:20201006T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/5
DESCRIPTION:Title: Cubulations determined by their length function\nby El
ia Fioravante (Max Planck Institute\, Bonn) as part of Brandeis Topology S
eminar\n\n\nAbstract\nThe theory of group actions on CAT(0) cube complexes
has exerted a strong influence on geometric group theory and low-dimensio
nal topology in the last two decades. Indeed\, knowing that a group G acts
properly and cocompactly on a CAT(0) cube complex reveals a lot of its al
gebraic structure. However\, in general\, "cubulations" are non-canonical
and the group G can act on cube complexes in many different ways. It is th
us natural to attempt to classify all such actions for a fixed group G\, i
deally obtaining a good notion of "space of all cubulations of G". As a fi
rst step\, we show that G-actions on CAT(0) cube complexes are often compl
etely determined by their length function. This yields a simple topology o
n this space and a natural compactification resembling Thurston's compacti
fication of Teichmüller space. Based on joint works with J. Beyrer and M.
Hagen.\n\nhttps://brandeis.zoom.us/j/99772088777\n\nPassword hint: negati
vely curved (in algebra and geometry)\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Duncan (James Madison University)
DTSTART:20201013T180000Z
DTEND:20201013T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/6
DESCRIPTION:Title: Bundle splittings on boundary-punctured disks\nby Davi
d Duncan (James Madison University) as part of Brandeis Topology Seminar\n
\n\nAbstract\nOver a Riemann surface\, a bundle pair is a holomorphic bund
le together with a totally real subbundle on the boundary. A result of Oh
states that\, over a disk\, a bundle pair splits as a sum of line bundle p
airs. We discuss work-in-progress that seeks to extend Oh's result to boun
dary-punctured disks. The strategy is to use the Yang--Mills gradient flow
for singular connections to identify the relevant bundle isomorphism.\nht
tps://brandeis.zoom.us/j/99772088777\n\nPassword hint: negatively curved (
in algebra and geometry)\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jonathan Simone (UMass Amherst)
DTSTART:20201020T180000Z
DTEND:20201020T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/7
DESCRIPTION:Title: Using rational homology circles to construct rational homo
logy balls\nby Jonathan Simone (UMass Amherst) as part of Brandeis Top
ology Seminar\n\n\nAbstract\nMotivated by Akbulut-Larson's construction of
Brieskorn spheres bounding rational homology 4-balls\, we explore plumbed
3-manifolds that bound rational homology circles and use them to construc
t infinite families of rational homology 3-spheres that bound rational hom
ology 4-balls. In particular\, we will classify torus bundles over the cir
cle that bound rational homology circles and provide a simple method for c
onstructing more general plumbed 3-manifolds that bound rational homology
circles. We then use these rational homology circles to show that\, for ex
ample\, -1-surgery along any twisted positively-clasped Whitehead double o
f any knot bounds a rational homology 4-ball.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Amitesh Datta (Princeton University)
DTSTART:20201027T180000Z
DTEND:20201027T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/8
DESCRIPTION:Title: Is the braid group $B_4$ a group of $3\\times 3$-matrices?
\nby Amitesh Datta (Princeton University) as part of Brandeis Topology
Seminar\n\n\nAbstract\nThe Burau representation is a classical linear rep
resentation of the braid group that can be used to define the Alexander po
lynomial invariant for knots and links. \n\nThe question of whether or not
the Burau representation of the braid group $B_4$ is faithful is an open
problem since the 1930s. The faithfulness of this representation is necess
ary for the Jones polynomial of a knot to detect the unknot.\n\nIn this ta
lk\, I will present my work on this problem\, which includes strong constr
aints on the kernel of this representation. The key techniques include a n
ew interpretation of the Burau matrix of a positive braid and a new decomp
osition of positive braids into subproducts.\n\nI will discuss all of the
relevant background for the problem from scratch and illustrate my techniq
ues through simple examples. I will also highlight the beautiful and elega
nt connections to bowling balls and quantum intersection numbers of simple
closed curves on punctured disks.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chris Scaduto (University of Miami)
DTSTART:20201103T190000Z
DTEND:20201103T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/9
DESCRIPTION:Title: Equivariant singular instanton homology\nby Chris Scad
uto (University of Miami) as part of Brandeis Topology Seminar\n\n\nAbstra
ct\nEvery knot is the boundary of a normally immersed disk in the 4-ball.
The 4D clasp number of a knot is the minimal number of double points over
all such immersed disks. In this talk I will explain how certain equivaria
nt cohomological constructions in singular instanton Floer theory lead to
new results for 4D clasp numbers and unknotting numbers of knots. This is
joint work with Ali Daemi.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ceren Kose (UT Austin)
DTSTART:20201110T190000Z
DTEND:20201110T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/10
DESCRIPTION:Title: Composite Knots with Symmetric Union Presentations\nb
y Ceren Kose (UT Austin) as part of Brandeis Topology Seminar\n\n\nAbstrac
t\nAbstract: A symmetric union of\n a knot is an aesthetically appealing c
onstruction which generalizes the connected sum of a knot and its mirror.
As the connected sum of a knot and its mirror is always ribbon\, hence smo
othly slice\, symmetric unions too are ribbon. Like the slice-ribbon quest
ion\,\n one may ask whether every ribbon knot is a symmetric union. This i
s the case for a high number of prime ribbon knots with up to 12 crossings
as well as some infinite families such as 2-bridge ribbon knots. However\
, for some composite ribbon knots no such presentation\n has yet been foun
d. Motivated by this\, I showed that these composite knots do not admit a
symmetric union presentation with a single twisting region. In my talk\, I
will first introduce the problem and outline a few results. Then I will g
ive my proof\, which\n is a short argument that relies on a Dehn filling d
escription of double branched cover and a result of Gordon and Luecke on r
educible fillings.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bülent Tosun (University of Alabama)
DTSTART:20201117T190000Z
DTEND:20201117T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/11
DESCRIPTION:Title: Symplectic and complex geometric aspects of the 3-manifol
d embedding problem in 4-space.\nby Bülent Tosun (University of Alaba
ma) as part of Brandeis Topology Seminar\n\n\nAbstract\nThe problem of emb
edding one manifold into another has a long\, rich history\, and proved to
be tremendously important for development of geometric topology since the
1950s. In this talk I will focus on the 3-manifold embedding problem in 4
-space. Given a closed\, orientable 3-manifold Y\, it is of great interest
but often a difficult problem to determine whether Y may be smoothly embe
dded in R^4. This is the case even for integer homology spheres\, and rest
ricting to special classes such as Seifert manifolds\, the problem is open
in general\, with positive answers for some such manifolds and negative a
nswers in other cases. On the other hand\, under additional geometric cons
iderations coming from symplectic geometry (such as hypersurfaces of conta
ct type) and complex geometry (such as the boundaries of holomorphically a
nd/or rationally convex Stein domains)\, the problems become tractable and
in certain cases a uniform answer is possible. For example\, recent work
shows for Brieskorn homology spheres: no such 3-manifold admits an embeddi
ng as a hypersurface of contact type in R^4\, which is to say as the bound
ary of a region that is convex from the point of view of symplectic geomet
ry. In this talk I will provide further context and motivations for this r
esult\, and give some details of the proof. \n\nThis is joint work with To
m Mark.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Carolyn Abbott (Columbia University)
DTSTART:20201201T190000Z
DTEND:20201201T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/12
DESCRIPTION:Title: Free products and random walks in acylindrically hyperbol
ic groups\nby Carolyn Abbott (Columbia University) as part of Brandeis
Topology Seminar\n\n\nAbstract\nAbstract: The properties of a random walk
on a group which acts on a hyperbolic metric space have been well-studied
in recent years. In this talk\, I will focus on random walks on acylindr
ically hyperbolic groups\, a class of groups which includes mapping class
groups\, Out(F_n)\, and right-angled Artin and Coxeter groups\, among many
others. I will discuss how a random element of such a group interacts wi
th fixed subgroups\, especially so-called hyperbolically embedded subgroup
s. In particular\, I will discuss when the subgroup generated by a random
element and a fixed subgroup is a free product\, and I will also describe
some of the geometric properties of that free product. This is joint work
with Michael Hull.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yulan Qing (Fudan University)
DTSTART:20201208T190000Z
DTEND:20201208T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/13
DESCRIPTION:Title: The Large Scale Geometry of Big Mapping Class Groups\
nby Yulan Qing (Fudan University) as part of Brandeis Topology Seminar\n\n
\nAbstract\nAbstract: In this talk\, we introduce the framework of the coa
rse geometry of non-locally compact groups in the setting of big mapping c
lass groups\, as studied by Rosendal. We will discuss the characterization
results of Mann-Rafi and Horbez-Qing-Rafi that illustrate big mapping gro
ups' rich geometric and algebraic structures. We will outline the proofs i
n these results and their implications. If time permits\, we will discuss
some open problems in this area.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chris Leininger (Rice University)
DTSTART:20210202T190000Z
DTEND:20210202T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/14
DESCRIPTION:Title: Billiards\, symbolic coding\, and cone metrics\nby Ch
ris Leininger (Rice University) as part of Brandeis Topology Seminar\n\n\n
Abstract\nGiven a polygon in the Euclidean or hyperbolic plane a billiard
trajectory in the polygon is the geodesic path of a particle in the polygo
n bouncing off the sides so that the angle of reflection is equal to the a
ngle incidence. A billiard trajectory determines a symbolic coding via th
e sides of the polygon encountered. In this talk I will describe joint wo
rk with Erlandsson and Sadanand showing the extent to which the set of all
coding sequences\, the bounce spectrum\, determines the shape of a hyperb
olic polygon. We completely characterize those polygons which are billiar
d rigid (the generic case)\, meaning that they are determined up to isomet
ry by their bounce spectrum. When rigidity fails for a polygon P\, we par
ameterize the space of polygons having the same bounce spectrum at P. The
se results for billiards are a consequence of a rigidity/flexibility theor
em for negatively curved hyperbolic cone metrics. In the talk I will expl
ain the theorem about hyperbolic billiards\, comparing/contrasting it with
the Euclidean case (earlier work with Duchin\, Erlandsson\, and Sadanand)
. Then I will explain the relationship with hyperbolic cone metrics\, sta
te our rigidity/flexibility theorem for such metrics\, and as time allows
describe some of the ideas involved in the proofs.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kasia Jankiewicz (University of Chicago)
DTSTART:20210406T180000Z
DTEND:20210406T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/15
DESCRIPTION:Title: Splittings of Artin groups\nby Kasia Jankiewicz (Univ
ersity of Chicago) as part of Brandeis Topology Seminar\n\n\nAbstract\nWe
show that many 2-dimensional Artin groups split as graphs of finite rank f
ree groups. In particular\, this is true for all triangle Artin groups A(m
\,n\,p) where m\,n\,p>2\, or m=2 and n\,p>3. For many of those groups\, we
use the splitting to prove that the Artin group is residually finite. In
particular\, all triangle Artin groups with even labels are residually fin
ite.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marco Golla (Université de Nantes)
DTSTART:20210209T190000Z
DTEND:20210209T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/16
DESCRIPTION:Title: 3-manifolds that bound no definite 4-manifold\nby Mar
co Golla (Université de Nantes) as part of Brandeis Topology Seminar\n\n\
nAbstract\nAll 3-manifolds bound 4-manifolds\, and many construction of 3-
manifolds automatically come with a 4-manifold bounding it. Often times th
ese 4-manifolds have definite intersection form. Using Heegaard Floer corr
ection terms and an analysis of short characteristic covectors in bimodula
r lattices\, we give an obstruction for a 3-manifold to bound a definite 4
-manifold\, and produce some concrete examples. This is joint work with Ky
le Larson.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hans Boden (McMaster University)
DTSTART:20210216T190000Z
DTEND:20210216T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/17
DESCRIPTION:Title: The Gordon-Litherland pairing for knots in thickened surf
aces\nby Hans Boden (McMaster University) as part of Brandeis Topology
Seminar\n\n\nAbstract\nWe introduce the Gordon-Litherland pairing for kno
ts and links in thickened surfaces that bound unoriented spanning surfaces
. Using the GL pairing\, we define signature and determinant invariants.
We relate the invariants to those derived from the Tait graph and Goeritz
matrices. These invariants depend only on the $S^*$ equivalence class of t
he spanning surface\, and the determinants give a simple criterion to chec
k if the knot or link is minimal genus. The GL pairing is isometric to the
relative intersection pairing on a 4-manifold obtained as the 2-fold cove
r along the surface. These results are joint work with M. Chrisman and H.
Karimi. One can also use the GL pairing to give a topological characteriza
tion of alternating links in thickened surfaces\, extending the results of
J. Greene and J. Howie.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kevin Schreve (University of Chicago)
DTSTART:20210223T190000Z
DTEND:20210223T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/18
DESCRIPTION:Title: Generalized Tits Conjecture for Artin groups\nby Kevi
n Schreve (University of Chicago) as part of Brandeis Topology Seminar\n\n
\nAbstract\nIn 2001\, Crisp and Paris showed the squares of the standard g
enerators of an Artin group generate an "obvious" right-angled Artin subgr
oup. This resolved an earlier conjecture of Tits. I will introduce a gener
alization of this conjecture\, where we ask that a larger set of elements
generates another "obvious" right-angled Artin subgroup.\nI will give evid
ence that this is a good generalization\, explain what classes of Artin gr
oups we can prove it for\, and give some applications. All of it is joint
work with Kasia Jankiewicz.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Maria Cumplido (Universidad de Sevilla)
DTSTART:20210316T180000Z
DTEND:20210316T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/19
DESCRIPTION:Title: Parabolic subgroups of large-type Artin groups\nby Ma
ria Cumplido (Universidad de Sevilla) as part of Brandeis Topology Seminar
\n\n\nAbstract\nArtin groups are a natural generalisation of braid groups
from an algebraic point of view: in the same way that braids are obtained
from the presentation of the symmetric group\, other Coxeter groups give r
ise to more general Artin groups. There are very few results proven for ev
ery Artin group. To study them\, specialists have focused on some special
kind of subgroup\, called "parabolic subgroups". These groups are used to
build important simplicial complexes\, as the Deligne complex or the rece
nt complex of irreducible parabolic subgroups. The question "Is the inters
ection of parabolic subgroups a parabolic subgroup?" is a very basic quest
ion whose answer is only known for spherical Artin groups and RAAGs. In th
is talk\, we will see how we can answer this question in Artin groups of l
arge type\, by using the geometric realisation of the poset of parabolic s
ubgroups\, that we have named "Artin complex". In particular\, we will sho
w that this complex in the large case has a property called sistolicity (a
sort of weak CAT(0) property) that allows us to apply techniques from geo
metric group theory. This is a joint work with Alexandre Martin and Nicola
s Vaskou.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Delphine Moussard (Université de Aix-Marseille)
DTSTART:20210323T180000Z
DTEND:20210323T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/20
DESCRIPTION:Title: A triple point invariant and the slice and ribbon genera<
/a>\nby Delphine Moussard (Université de Aix-Marseille) as part of Brande
is Topology Seminar\n\n\nAbstract\nThe T-genus of a knot is the minimal nu
mber of borromean-type triple points on a normal singular disk with no cla
sp bounded by the knot\; it is an upper bound for the slice genus. Kawauch
i\, Shibuya and Suzuki characterized the slice knots by the vanishing of t
heir T-genus. I will explain how this generalizes to provide a 3-dimension
al characterization of the slice genus. Further\, I will show that the dif
ference between the T-genus and the slice genus can be arbitrarily large.
Finally\, I will introduce the ribbon counterpart of the T-genus\, which i
s an upper bound for the ribbon genus\, and we will see that the T-genus a
nd the ribbon T-genus coincide for all knots if and only if all slice knot
s are ribbon.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Piotr Przytycki (McGill University)
DTSTART:20210413T180000Z
DTEND:20210413T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/21
DESCRIPTION:Title: Tail equivalence of unicorn paths\nby Piotr Przytycki
(McGill University) as part of Brandeis Topology Seminar\n\n\nAbstract\nL
et S be an orientable surface of finite type. Using Pho-On's infinite unic
orn paths\, we prove the hyperfiniteness of the orbit equivalence relation
coming from the action of the mapping class group of S on the Gromov boun
dary of the arc graph of S. This is joint work with Marcin Sabok.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:William Ballinger (Princeton University)
DTSTART:20210309T190000Z
DTEND:20210309T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/22
DESCRIPTION:Title: Concordance invariants from Khovanov homology\nby Wil
liam Ballinger (Princeton University) as part of Brandeis Topology Seminar
\n\n\nAbstract\nThe Lee differential and Rasmussen's E(-1) differential ac
ting on\nKhovanov homology combine to give a pair of cancelling differenti
als\,\nan algebraic structure that has been studied in the context of knot
\nFloer homology. I will describe some concordance invariants that come\nf
rom this structure\, with applications to nonorientable genus bounds\nand
linear independence in the concordance group.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ryan Budney (University of Victoria)
DTSTART:20210330T180000Z
DTEND:20210330T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/23
DESCRIPTION:Title: Isotopy in dimension 4\nby Ryan Budney (University of
Victoria) as part of Brandeis Topology Seminar\n\n\nAbstract\nThis talk w
ill describe a diffeomorphism of "the barbell manifold" and what it tells
us about smooth isotopy of 3-manifolds in some small 4-manifolds. Specific
ally\, the "barbell" is the (4\,2)-handlebody of genus 2\, i.e. the bounda
ry connect-sum of two copies of $S^2 \\times D^2$. We show that the mappin
g class group of the barbell manifold\, i.e. $\\pi_0 Diff(Barbell)$\, wher
e the diffeomorphisms fix the boundary pointwise\, is infinite cyclic -- a
fter perhaps modding out by the mapping class group of $D^4$. We then cons
ider embedding the barbell into various 4-manifolds\, and the question of
whether or not the natural extension of the barbell diffeomorphism is isot
opically trivial in these 4-manifolds. From this we can conclude that the
mapping class groups of both $S^1 \\times D^3$ and $S^1 \\times S^3$ are n
ot finitely generated. For $S^1 \\times D^3$ the idea of the proof is to s
how these diffeomorphisms act non-trivially on the isotopy classes of redu
cing 3-balls\, i.e. show $f(\\{1\\}\\times D^3)$ is not isotopic to $\\{1\
\}\\times D^3$. To do this\, we imagine $D^3$ as a 2-parameter family of i
ntervals\, thus $f(\\{1\\}\\times D^3)$ can be viewed as producing an elem
ent of the 2nd homotopy group of the space of smooth embeddings of an inte
rval in $S^1 \\times D^3$. The core of the proof involves developing an in
variant that can detect the low-dimensional homotopy groups of embedding s
paces. These invariants can be thought of as Vassiliev invariants.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:No seminar
DTSTART:20210420T180000Z
DTEND:20210420T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/24
DESCRIPTION:by No seminar as part of Brandeis Topology Seminar\n\nAbstract
: TBA\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hannah Schwartz (Princeton University)
DTSTART:20210427T180000Z
DTEND:20210427T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/25
DESCRIPTION:Title: The failure of the 4D light bulb theorem with dual sphere
s of non-zero square\nby Hannah Schwartz (Princeton University) as par
t of Brandeis Topology Seminar\n\n\nAbstract\nExamples of surfaces embedde
d in a 4-manifold that are homotopic but not isotopic are neither rare nor
surprising. It is then quite amazing that\, in settings such as the recen
t 4D light bulb theorems of both Gabai and Schneiderman-Teichner\, the exi
stence of an embedded sphere of square zero intersecting a surface transve
rsally in a single point has the power to "upgrade" a homotopy of that sur
face into a smooth isotopy. We will discuss the limitations of this phenon
emon\, using contractible 4-manifolds called corks to produce homotopic sp
heres in a 4-manifold with a common dual of non-zero square that are not s
moothly isotopic.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dan Margalit (Georgia Tech)
DTSTART:20210504T180000Z
DTEND:20210504T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/26
DESCRIPTION:Title: Homomorphisms of braid groups and totally symmetric sets<
/a>\nby Dan Margalit (Georgia Tech) as part of Brandeis Topology Seminar\n
\n\nAbstract\nIn joint work with Kevin Kordek and Lei Chen\, we completely
classify homomorphisms from the braid group on n strands to the braid gro
up on 2n strands. One of the main new tools is the theory of totally symm
etric sets\, which has found many other applications. We will begin with
a survey of known classifications of homomorphisms of braid groups\, and t
hen explain how to classify endomorphisms of the braid group using totally
symmetric sets.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Sullivan (UMass Amherst)
DTSTART:20211005T180000Z
DTEND:20211005T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/27
DESCRIPTION:Title: Displacing Legendrian submanifolds in contact geometry\nby Michael Sullivan (UMass Amherst) as part of Brandeis Topology Semina
r\n\n\nAbstract\nLagrangian and Legendrian submanifolds of symplectic and
contact manifolds are sometimes ``flexible" like smooth topology\, and som
etimes ``rigid" like differential geometry. Pseudo-holomorphic curves\, al
gebraically packaged into various Floer-theory or Gromov-Witten-theory inv
ariants\, have played a (maybe even ``the") main role in proving rigidity
results. But if the invariants vanish\, does this mean the objects of stu
dy are flexible? I will discuss\, using the barcodes of a persistence Floe
r-type homology\, how to extract (sometimes optimal) quantitative rigidity
results for Legendrian submanifolds\, even when the traditional Floer-the
ory invariants vanish. I plan to give the talk remotely\, but in real-tim
e\, to keep the pace more accessible. This is joint work with Georgios Dim
itroglou Rizell.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/27/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yajit Jain (Brown University)
DTSTART:20211012T180000Z
DTEND:20211012T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/28
DESCRIPTION:Title: Topologically Trivial Families of Smooth h-Cobordisms
\nby Yajit Jain (Brown University) as part of Brandeis Topology Seminar\n\
n\nAbstract\nIn this talk we will discuss topologically trivial families o
f smooth h-cobordisms. Using work of Dwyer\, Weiss\, and Williams\, we can
assign a K-theoretic invariant to these bundles\, the smooth structure ch
aracteristic\, which is closely related to the higher Franz–Reidemeister
torsion invariants studied by Igusa. After describing constructions of th
ese bundles due to Goette and Igusa\, we will indicate how one can compute
the smooth structure characteristic using Morse theory\, and outline a pr
oof of their Rigidity Conjecture. Time permitting\, we will also briefly d
iscuss a relationship between these invariants and symplectic topology.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/28/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Alvarez-Gavela (MIT)
DTSTART:20211019T180000Z
DTEND:20211019T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/29
DESCRIPTION:Title: The nearby Lagrangian conjecture from the K-theoretic vie
wpoint.\nby Daniel Alvarez-Gavela (MIT) as part of Brandeis Topology S
eminar\n\n\nAbstract\nI will discuss two K-theoretic aspects of the nearby
Lagrangian conjecture. The first is joint work with M. Abouzaid\, S. Cour
te and T. Kragh and uses a factoring of the Waldhausen derivative to obtai
n new restrictions on the smooth structure of nearby Lagrangians. The seco
nd is joint work in progress with K. Igusa and M. Sullivan and attempts to
use a higher Whitehead torsion invariant to obtain new restrictions on th
e stable isomorphism classes of tube bundles which may be used to generate
nearby Lagrangians.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/29/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zihao Liu (Brandeis University)
DTSTART:20211026T180000Z
DTEND:20211026T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/30
DESCRIPTION:Title: Scaled homology and topological entropy (in person)\n
by Zihao Liu (Brandeis University) as part of Brandeis Topology Seminar\n\
n\nAbstract\nIn this talk\, I will introduce a scaled homology theory\, lc
-homology\, for metric spaces such that every metric space can be visually
regarded as “locally contractible” with this newly-built homology. In
addition\, after giving a brief introduction of topological entropy\, I w
ill discuss how to generalize one of the existing results of entropy conje
cture\, relaxing the smooth manifold restrictions on the compact metric sp
aces\, by using lc-homology groups. This is joint work with Bingzhe Hou an
d Kiyoshi Igusa.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/30/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jacob Russell (Rice University)
DTSTART:20211102T180000Z
DTEND:20211102T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/31
DESCRIPTION:Title: Searching for geometric finiteness using surface group ex
tensions\nby Jacob Russell (Rice University) as part of Brandeis Topol
ogy Seminar\n\n\nAbstract\nFarb and Mosher defined convex cocompact subgro
ups of the mapping class group in analogy with convex cocompact Kleinian g
roups. These subgroups have since seen immense study\, producing surprisin
g applications to the geometry of surface group extension and surface bund
les. In particular\, Hamenstadt plus Farb and Mosher proved that a subgrou
p of the mapping class groups is convex cocompact if and only if the corre
sponding surface group extension is Gromov hyperbolic.\n\nAmong Kleinian g
roups\, convex cocompact groups are a special case of the geometrically fi
nite groups. Despite the progress on convex cocompactness\, no robust noti
on of geometric finiteness in the mapping class group has emerged. Durham\
, Dowdall\, Leininger\, and Sisto recently proposed that geometric finiten
ess in MCG(S) might be characterized by the corresponding surface group ex
tension being hierarchically hyperbolic instead of Gromov hyperbolic. We p
rovide evidence in favor of this hypothesis by proving that the surface gr
oup extension of the stabilizer of a multicurve is hierarchically hyperbol
ic.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/31/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anthony Conway (MIT)
DTSTART:20211109T190000Z
DTEND:20211109T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/32
DESCRIPTION:Title: Stable diffeomorphism and homotopy equivalence (in person
)\nby Anthony Conway (MIT) as part of Brandeis Topology Seminar\n\n\nA
bstract\nIn this talk\, we consider the difference between stable diffeomo
rphism and homotopy equivalence. Here\, two 2n-manifolds are called stably
diffeomorphic if they become diffeomorphic after connect summing with eno
ugh copies of $S^n\\times S^n$. After providing some motivation from surg
ery theory\, we describe families of stably diffeomorphic manifolds that a
re not pairwise homotopy equivalent. This is based on joint work with Crow
ley\, Powell and Sixt.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/32/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lorenzo Ruffoni (Tufts University)
DTSTART:20211116T190000Z
DTEND:20211116T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/33
DESCRIPTION:Title: In person\nby Lorenzo Ruffoni (Tufts University) as p
art of Brandeis Topology Seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/33/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ivan Levcovitz (Tufts University)
DTSTART:20211123T190000Z
DTEND:20211123T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/34
DESCRIPTION:Title: Coxeter groups with connected Morse boundary\nby Ivan
Levcovitz (Tufts University) as part of Brandeis Topology Seminar\n\n\nAb
stract\nThe Morse boundary is a quasi-isometry invariant that encodes the
possible "hyperbolic" directions of a group. The topology of the Morse bou
ndary can be challenging to understand\, even for simple examples. In this
talk\, I will focus on a basic topological property: connectivity and on
a well-studied class of CAT(0) groups: Coxeter groups. I will discuss a cr
iteria that guarantees that the Morse boundary of a Coxeter group is conne
cted. In particular\, when we restrict to the right-angled case\, we get a
full characterization of right-angled Coxeter groups with connected Morse
boundary. This is joint work with Matthew Cordes.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/34/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cary Malkiewich (Binghamton University)
DTSTART:20211207T190000Z
DTEND:20211207T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/35
DESCRIPTION:Title: Fixed point theory and the higher characteristic polynomi
al\nby Cary Malkiewich (Binghamton University) as part of Brandeis Top
ology Seminar\n\n\nAbstract\nI'll give a highly revisionist account of cla
ssical Nielsen fixed-point theory\, putting it in the context of modern tr
ace methods by arguing that its central invariant is most naturally a clas
s in topological Hochschild homology (THH). I'll then describe how this ge
neralizes to periodic points and topological restriction homology (TR)\, a
nd how these invariants fit together to give a far-reaching generalization
of the characteristic polynomial from linear algebra. Much of this is joi
nt work with Ponto\, and separately with Campbell\, Lind\, Ponto\, and Zak
harevich.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/35/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michah Sageev (Technion Institute)
DTSTART:20211130T190000Z
DTEND:20211130T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/36
DESCRIPTION:Title: Right angled Coxeter groups acting on CAT(0) cube complex
es\nby Michah Sageev (Technion Institute) as part of Brandeis Topology
Seminar\n\n\nAbstract\nWe will discuss a type of rigidity that one can ho
pe for in the setting of proper\, cocompact actions of right angled Coxete
r groups acting on CAT(0) cube complexes\, and some partial results in thi
s direction. This is joint work with Ivan Levcovitz.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/36/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marissa Miller (UIUC)
DTSTART:20220215T190000Z
DTEND:20220215T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/37
DESCRIPTION:Title: Hierarchical hyperbolicity and stability in handlebody gr
oups\nby Marissa Miller (UIUC) as part of Brandeis Topology Seminar\n\
n\nAbstract\nIn this talk\, we explore the geometry of the handlebody grou
p\, i.e. the mapping class group of a handlebody. These groups can be view
ed as subgroups of surface mapping class groups and on the surface seem si
milar\, but based on the current state of research\, the geometry of handl
ebody groups appears to be very different than the geometry of surface map
ping class groups. In this talk we will explore two different geometric no
tions: hierarchical hyperbolicity (of which surface mapping class groups a
re the prototype)\, and stable subgroups\, which have a nice characterizat
ion in the surface mapping class groups in terms of the orbit map to the c
urve graph. I will discuss how the genus two handlebody group is also hier
archically hyperbolic and has an analogous stable subgroup characterizatio
n\, and I will also discuss what goes wrong in the higher genus cases that
prevents hierarchical hyperbolicity and the existence of an analogous sta
ble subgroup characterization.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/37/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jingyin Huang (Ohio State University)
DTSTART:20220310T203000Z
DTEND:20220310T213000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/39
DESCRIPTION:Title: The Helly geometry of some Garside and Artin groups\n
by Jingyin Huang (Ohio State University) as part of Brandeis Topology Semi
nar\n\n\nAbstract\nGarside groups and Artin groups are two generalizations
of braid groups. We show that weak Garside groups of finite type and FC-t
ype Artin groups acts geometrically metric spaces which are non-positively
in an appropriate sense\, i.e. they act geometrically on Helly graphs\, a
s well as metric spaces with convex geodesic bicombings. We will also disc
uss several algorithmic and \, geometric and topological consequences of t
he existence of such an action. This is joint work with D. Osajda.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/39/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bernard Badzioch (University of Buffalo)
DTSTART:20220301T190000Z
DTEND:20220301T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/40
DESCRIPTION:Title: Categorical algebra and mapping spaces\nby Bernard Ba
dzioch (University of Buffalo) as part of Brandeis Topology Seminar\n\n\nA
bstract\nMany classical results in homotopy theory show that iterated loop
spaces\, i.e. pointed mapping spaces \nfrom a sphere\, can be identified
with spaces equipped with a certain algebraic structure described by means
of an operad\, a prop\, an algebraic theory etc. A natural questions is w
hether analogous algebraic description can be used to characterize mapping
spaces with the domain given by a space different than a sphere.\n \nThe
talk will describe some results in this area.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/40/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lev Tostopyat-Nelip (Michigan State University)
DTSTART:20220315T180000Z
DTEND:20220315T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/41
DESCRIPTION:Title: Floer homology and quasipositive surfaces\nby Lev Tos
topyat-Nelip (Michigan State University) as part of Brandeis Topology Semi
nar\n\n\nAbstract\nOzsvath and Szabo have shown that knot Floer homology d
etects the genus of a knot - the largest Alexander grading of a non-trivia
l homology class is equal to the genus.\nWe give a new contact geometric i
nterpretation of this fact by realizing such a class via the transverse kn
ot invariant introduced by Lisca\, Ozsvath\, Stipsicz and Szabo. Our appro
ach relies on the "convex decomposition theory" of Honda\, Kazez and Matic
- a contact geometric interpretation of Gabai's sutured hierarchies. \nWe
use this new interpretation to study the "next-to-top" summand of knot Fl
oer homology\, and to show that Heegaard Floer homology detects quasi-posi
tive Seifert surfaces. Some of this talk represents joint work with Matthe
w Hedden.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/41/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dave Auckly (Kansas State University)
DTSTART:20220322T180000Z
DTEND:20220322T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/42
DESCRIPTION:Title: Branched covers in low dimensions.\nby Dave Auckly (K
ansas State University) as part of Brandeis Topology Seminar\n\n\nAbstract
\nThis talk will begin with several basic examples of branched covers.\nIt
will then present several results about the existence and non-existence o
f branched covers in low dimensional settings.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/42/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lei Chen (University of Maryland)
DTSTART:20220329T180000Z
DTEND:20220329T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/43
DESCRIPTION:Title: Actions of Homeo and Diffeo groups on manifolds\nby L
ei Chen (University of Maryland) as part of Brandeis Topology Seminar\n\n\
nAbstract\nIn this talk\, I discuss the general question of how to obstruc
t and construct group actions on manifolds. I will focus on large groups l
ike Homeo(M) and Diff(M) about how they can act on another manifold N. The
main result is an orbit classification theorem\, which fully classifies p
ossible orbits. I will also talk about some low dimensional applications a
nd open questions. This is a joint work with Kathryn Mann.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/43/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Maria Cumplido (University of Seville)
DTSTART:20220405T180000Z
DTEND:20220405T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/44
DESCRIPTION:Title: Conjugacy stability in Artin groups\nby Maria Cumplid
o (University of Seville) as part of Brandeis Topology Seminar\n\n\nAbstra
ct\nArtin (or Artin-Tits) groups are generalizations of braid groups that
are defined using a finite set of generators $S$ and relations $abab\\cdot
s=baba\\cdots$\, where both words of the equality have the same length. Al
though this definition is quite simple\, there are very few results known
for Artin groups in general. Classic problems as the word problem or the c
onjugacy problem are still open. In this talk\, we study a problem concern
ing a family of subgroups of Artin groups: parabolic subgroups. These subg
roups have proven to be useful when studying Artin groups (for example\, t
hey are used to build interesting simplicial complexes)\, but again\, we d
o not know much about them in general. \n\nOur problem will be the followi
ng: Given two conjugate elements of a parabolic subgroup $P$ of an Artin g
roup $A$\, are they conjugate via an element of $P$? This is called the co
njugacy stability problem. In 2014\, González-Meneses proved that this is
always true for braids\, that is\, geometric embeddings of braids do not
merge conjugacy classes. In an article with Calvez and Cisneros de la Cruz
\, we gave a classification for spherical Artin groups and proved that the
answer to the question is not always affirmative. In this talk\, we will
explain how to give an algorithm to solve this problem for every Artin gro
up satisfying three properties that are conjectured to be always true.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/44/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aleksandra Kjuchukova (Notre Dame University)
DTSTART:20220412T180000Z
DTEND:20220412T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/45
DESCRIPTION:Title: H-slice knots in $\\#^m\\mathbb{CP}^2$\nby Aleksandra
Kjuchukova (Notre Dame University) as part of Brandeis Topology Seminar\n
\n\nAbstract\nLet $K\\subset S^3$ be a knot and let $X$ be a closed smooth
four-manifold. Does $K$ bound a smooth/locally flat null-homologous disk
properly embedded in $X$ minus an open ball? (If so\, we say $K$ is smoot
hly/topologically H-slice in $X$.) The classification of H-slice knots in
a 4-manifold $X$ can help detect exotic smooth structures on $X$. I will d
escribe new tools to compute the (smooth or topological) $\\mathbb{CP}^2$
slicing number of a knot $K$\, which is the smallest $m$ such that $K$ is
(smoothly or topologically) H-slice in $\\#^m\\mathbb{CP}^2$. This talk is
based on arXiv:2112.14596.\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/45/
END:VEVENT
BEGIN:VEVENT
SUMMARY:No talk
DTSTART:20220308T190000Z
DTEND:20220308T203000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/46
DESCRIPTION:by No talk as part of Brandeis Topology Seminar\n\nAbstract: T
BA\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/46/
END:VEVENT
BEGIN:VEVENT
SUMMARY:No talk
DTSTART:20220419T180000Z
DTEND:20220419T193000Z
DTSTAMP:20260404T100027Z
UID:BrandeisTopology/47
DESCRIPTION:by No talk as part of Brandeis Topology Seminar\n\nAbstract: T
BA\n
LOCATION:https://stable.researchseminars.org/talk/BrandeisTopology/47/
END:VEVENT
END:VCALENDAR