Past Seminars
Date 
Speaker 
Title/Abstract 
Nov 15/18  Spiro Karigiannis, University of Waterloo  A curious system of second order nonlinear PDEs for U(m)structures on manifolds 
Oct 25/18  Mehmetcik Pamuk, McMaster University  Arbitrarily large factorizations in mapping class groups 
Nikolai Saveliev, University of Miami  On the Frøyshov invariant and monopole Lefschetz number  
Oct 18/18  Elizabeth Drellich, Swarthmore College  tba 
Oct 4/18  Jesse Madnick McMaster University 
tba 
Sept 13/18  Tyrone Ghaswala McMaster University 
Amalgamated free products of circularly ordered groups 
Apr 27/18  Rita Gitik University of Michigan 
A new algorithm in group theory 
Apr 12/18  Elise Villella University of Pittsburgh 
Virtual GelfandZetlin polytopes 
Apr 5/18  Yulan Qing University of Toronto 
Loops with large twist get short along quasigeodesics in 
Mar 29/18  Andreas Arvanitoyeorgos University of Patras 
Homogeneous geodesics and twostep homogeneous geodesics in homogeneous spaces 
Mar 22/18  Patrick Naylor University of Waterloo 
Surface bundles over surfaces 
Mar 22/18  Erik Pedersen (University of Copenhagen):  Controlled algebra and topological data analysis 
Mar 8/18  Giulio Tiozzo (University of Toronto):  Counting loxodromic elements 
Feb 15/18  Kasia Jankiewicz McGill University 
Cubical dimension of small cancellation groups 
Feb 1/18  ??? McMaster University 
Perelman’s functionals on compact manifolds with isolated conical singularities 
Jan 25/18  Matthias Nagel McMaster University 
Surface systems and triple linking numbers 
Jan 4/18  Dave Auckly Kansas State University 
Stable equivalence of smoothly knotted surfaces 
Dec 7/17  Tyrone Ghaswala University of Waterloo 
Coverings, groupoids, and embedding braids in mapping class groups 
Nov 30/17  David Duncan McMaster University 
Some open problems in gauge theory, symplectic geometry, and lowdimensional topology 
Nov 23/17  Christopher Davis University of Wisconsin at Eau Claire 
Concordance of knots in homology spheres and the solvable filtration 
Nov 17/17  Nikolai Saveliev University of Miami 
On gauge theoretic invariants of homology S1×S3 
Nov 9/17  Katherine Raoux Michigan State University 

Nov 2/17  Anja Randecker University of Toronto 
On Loch Ness monsters and wild singularities – a Halloweeninspired introduction to infinite translation surfaces 
Oct 26/17  Jonathan Hillman University of Sydney 
Complements of closed hypersurfaces in S4 
Oct 19/17  Matthias Nagel McMaster University 
Concordance and the GordonLitherland lattice 
Oct 12/17  George Dragomir McMaster University 
Metric transforms yielding Gromov hyperbolic spaces 
Oct 2/17  Klaus Kröncke University of Hamburg 
Stability of ALE Ricciflat manifolds under Ricciflow 
Sept 21/17  Hari Kunduri Memorial University of Newfoundland 
Geometric inequalities for black hole initial data sets 
Sept 14/17  Steven Boyer Département de mathématiques Université du Québec à Montréal 
Branched Covers of Quasipositive Links and LSpaces 
April 6/17  McKenzie Wang Math & Stats Dept McMaster University 
Some examples of ancient solutions to the Ricci flow 
Mar 23/17  Panagiotis Giannioti Waterloo 
Regularity theory for Type I Ricci flows 
Mar 30/17  Hans Boden McMaster University 
Slice obstructions for virtual knots 
Mar 16/17  Nima Anvari Math & Stats Dept McMaster University 
Equivariant RhoInvariants and Instanton Homology of Torus Knots 
Mar 9/17  Gary Kennedy Ohio State 
Topicalizing spherical varieties 
Mar 2/17  Larry Siebenmann  Analyzing surface flows using trees and the BendixsonMather 2disk 
Feb 23/17  Chris Herald University of Nevada, Reno 
Obtaining reduced Khovanov homology from traceless character varieties 
Feb 16/17  Megumi Harada McMaster University 
NewtonOkounkov bodies and integrable systems 
Feb 9/17  Balazs Elek Cornell 
Pizzas and KazhdanLusztig atlases on toric surfaces 
Feb 2/17  Tyrone Ghaswala Waterloo 
Mapping class groups, coverings, braids and groupoids 
Jan 25/17  Victor Mouquin University of Toronto 
One some holomorphic Poisson structures related to geometric representation theory 
Jan 19/17  Ali Aleyasin  The Calabi problem on edgecone manifolds 
Jan 12/17  Cagatay Kutluhan University of Buffalo 
Filtering the Heegaard Floer contact invariant 
Jan 5/17  George Dragomir McMaster University 
On the existence of closed geodesics on compact developable orbifolds 
Nov 18/16  Steffen Marcus College of New JerseySjuvon Chung Rutgers University 
Fans of logarithmic structures (Joint with Algebra Seminar)Euler characteristics of cominuscule quantum $K$theory 
Nov 11/16  Doug Schultz Rutgers University 
Lagrangian Floer theory in symplectic fibrations 
Nov 4/16  Changliang Wang McMaster University 
Stability of Riemannian manifolds with Killing spinors 
Oct 21/16  Kristen Hendricks Michigan State University 
Involutive Heegaard Floer homology 
Sept 30/16  Alex Kuronya Budapest Univ. of Tech & Econ.Geoff Scott University of Toronto 
Positivity of line bundles and equations defining projective varieties 
Oct 7/16  Maxime Fortier Bourque University of Toronto 
The Teichmuller space of conformal pentagons 
Sept 23/16  Naoki Fujita Tokyo Institute of Technology 
NewtonOkounkov polytopes of Schubert varieties and folding method 
Sept 16/16  Akos Nagy University of Waterloo 
The Berry connection of the Ginzburg–Landau vortices 
Mar 10/16  Grigorios Fournodavlos University of Toronto 
Singular Ricci solitons and their stability under the Ricci flow 
Mar 3/16  Matthias Nagel UQAM 
Minimal genus in circle bundles over 3manifolds 
Feb 25/16  Hiraku Abe McMaster University 
The cohomology of Hessenberg varieties and representations of symmetric groups 
Feb 4/16  Iva Halacheva University of Toronto 
The Gromov width of coadjoint orbits of the symplectic group 
Jan 14/16  David Rosenthal St. John’s 
Large scale geometry of groups 
Nov 26/15  Peter Crooks University of Toronto 
Minimal nilpotent Hessenberg varieties 
Nov 20/15  Martha Precup Northwestern 
The Betti numbers of parabolic Hessenberg varieties 
Nov 12/15  Long Li McMaster Universilty 
On conic constant scalar curvature Kaehler(cscK) metrics 
Nov 5/15  John Shareshian Washington St. Louis 
Applying discrete Morse theory to complexes of graphs 
Oct 29/15  Alejandro Betancourt de la Parra Oxford 
Cohomogeneity one Ricci solitons 
Oct 22/15  Tatsuya Horiguchi McMaster University 
The equivariant cohomology rings of regular nilpotent Hessenberg varieties in Lie type A 
Oct 8/15  Federico Galetto McMaster University 
Tangent schemes of determinantal varieties 
Oct 1/15  David Duncan McMaster University 
On the critical values of the ChernSimons functional 
Sept 24/15  Jeremy Lane University of Toronto 
Convexity and the Thimm Trick 
Sept 17/15  Elisheva Adina Gamse Northeastern 
Vanishing relations in the cohomology of the moduli space of parabolic bundles 
Sept 10/15  Alexander Caviedes Castro Tel Aviv 
Idempotents and symmetries on QH(G(k, n)) 
Sept 3/15  Chris Cornwell UQAM 
Understanding character varieties of knot complements and 2fold branched covers through the cord ring 
May 20/15  Ergun Yalcin Bilkent University 
Group actions on spheres with rank one isotropy 
May 19/15  Robert Oliver University of Paris 13 
Automorphisms of pcompleted classifying spaces 
May 19/15  Sune Precht Reeh Massachusetts Institute of Technology 
Characteristic idempotents and fusion systems 
Apr 9/15  Chris Herald University of Nevada, Reno 
A LagrangianFloer theory in the pillowcase arising from traceless representations of knot groups 
Mar 19/15  Laurent Siebenmann Orsay 
Chambers and trees describing general foliations of the plane 
Mar 12/15  Ergun Yalcin McMaster University 
Rank Threee pGroup Actions on Products of Spheres 
Feb 26/15  Long Li McMaster University 
On the convexity of the Mabuchi energy functional along geodesics 
Feb 12/15  Steven Gindi University of Waterloo 
Holomorphic Twistor Spaces and Bihermitian Geometry 
Feb 5/15  Jihyeon Jessie Yang McMaster University 
Toric desingularization of GelfandZetlin toric variety 
Jan 29/15  Matt Luther McMaster University 
Continuous Model Theory and Flat Subspaces 
Jan 22/15  Cynthia Curtis The College of New Jersey 
The SL(2,C) Casson invariant for knots and the Ahat polynomial 
Jan 15/15  Alyson Hildum McMaster University 
Topological 4manifolds with RAAG fundamental groups 
Dec 18/14  Andreas Arvaniteorgeous University of Patras & Tufts University 
Progress on homogeneous Einstein manifolds 
Dec 4/14  Ronald Fintushel Michigan State University 
Pinwheels and fake projective planes 
Nov 27/14  Thomas Murphy California State Fullerton 
Complex Riemannian foliations of Kaehler manifolds 
Nov 20/14  Romina Arroyo University of Cordoba, Argentina 
Homogeneous Ricci solitons and the Alekseevskii conjecture in low dimensions 
Nov 13/14  Eric Harper McMaster University 
Virtual knots, almost classical knots, and their Alexander lnvariants 
Nov 6/14  Alejandro Adem University of British Columbia 
Homotopy Group Actions and Group Cohomology 
Oct 30/14  Oleg Chterental University of Toronto 
Virtual Braids and Virtual Curve Diagrams 
Oct 23/14  Shuguang Wang University of Missouri 
A compactification of the foliated ASD moduli spaces 
Oct 16/14  Nikolai Saveliev University of Miami 
Instanton knot homology and equivariant gauge theory 
Oct 2/14  Nima Anvari McMaster University 
Cyclic Group Actions on Contractible FourManifolds 
Sep 25/14  Ergun Yalcin Bilkent University 
Constructing finite group actions on homotopy spheres 
Sep 18/14  Long Li McMaster University 
Abstract 
Apr 3/14  Shahab Kalantari Amirkabir University of Technology 
Asymptotic Resemblance: A new approach to define a large scale structure on a set 
Mar 27/14  Peng Lu University of Oregon 
Shrinking Ricci solitons 
Mar 20/14  Blake Winter University of Buffalo 
Welded Knots and Ribbon Knots 
Mar 13/14  Eric Harper McMaster University 
The Virtual Knot Group and its Alexander Invariants 
Mar 6/14  Thomas Murphy McMaster University 
Spectral geometry of toric Einstein manifolds 
Jan 30/14  Dror BarNatan University of Toronto 
Trees and Wheels and Balloons and Hoops 
Jan 16/14  Laurent Siebenmann Orsay 
Vignettes from the rise of differential topology 
Dec 5/13  Diarmuid Crowley Max Planck Institute, Bonn 
The topology of Stein fillable contact manifolds in higher dimensions 
Nov 28/13  Chris Cappadocia McMaster University 
The weak hyperbolic dimension of metric spaces 
Nov 14/13  Thomas Murphy McMaster University 
Rigidity results for HermitianEinstein manifolds 
Nov 7/13  Yunxia Chen University of Waterloo 
ADE bundles over complex surfaces 
Oct 31/13  Alyson Hildum McMaster University 
The minimum b_2 problem for rightangled Artin groups 
Oct 17/13  Frederick Fong Brown University 
KahlerRicci flow and its singularity analysis 
Oct 10/13  Enxin Wu Western University 
A homotopy theory for diffeological spaces 
Oct 3/13  Karene Chu Massachusetts Institute of Technology 
Classification of flat virtual pure tangles 
Sep 19/13  Anna Bertiger University of Waterloo 
The action of Sp(n) on complex flags 
Sep 12/13  Bruce Williams University of Notre Dame 
Localizations and algebraic Ktheory

Apr 25/13  Masoud Khakhali University of Western Ontario 
Spectral zeta functions, scalar curvature, and GaussBonnet theorems in noncommutative geometry 
Apr 4/13  Nima Anvari McMaster University 
Equivariant gauge theory and fourmanifolds 
Mar 28/13  Reto Mueller Imperial College, London 
Dynamical stability and instability of Ricciflat metrics 
Mar 21/13  Saso Strle University of Ljubljana 
Unknotting number and concordance 
Mar 14/13  Alexander Kolpakov Vanderbilt University 
Geometric and combinatorial optimality of the hyperbolic 24cell 
Mar 7/13  Robert Haslhofer NYU 
Quantitative stratification and the regularity of mean curvature flow 
Feb 28/13  Mikhail Mazin SUNY 
Topology and combinatorics of certain compactified Jacobians 
Feb 14/13  David Duncan Rutgers University 
A compactness result for the quilted Atiyah–Floer conjecture 
Feb 7/13  Eric Harper McMaster University 
Akbulut corks and nontrivial involutions on instanton Floer homology 
Jan 31/13  Peter Samuelson University of Toronto 
Skein modules and the double affine Hecke algebra 
Jan 24/13  Tomoo Matsumura Korea Advanced Institute of Science and Technology (KAIST) 
Schubert calculus of weighted Grassmannians 
Jan 17/13  Maria Buzano McMaster University 
Ricci flow on homogeneous spaces 
Jan 10/13  Aaron Smith University of Waterloo 
The higher Riemann–Hilbert correspondence and extensions 
Nov 29/12  Ruxandra Moraru University of Waterloo 
Stable bundles on complex nilmanifolds 
Nov 22/12  David Rosenthal St. John’s University 
On the coarse asymptotic dimension of groups 
Nov 15/12  William Wylie Syracuse University 
Warped product rigidity 
Nov 8/12  Daniel Ruberman Brandeis University 
Embeddings of nonorientable surfaces in 4manifolds 
Nov 1/12  Jihyeon Jessie Yang McMaster University 
“Limits” of schemes 
Oct 25/12  Kate Petersen Florida State University 
The Euclidean algorithm and primitive roots 
Oct 11/12  Shintaro Kuroki University of Toronto 
Root systems of torus graphs and characterization of extended actions of torus manifolds 
Oct 4/12  Adam Clay UQAM 
Leftorderability, foliations, Lspaces and graph manifolds 
Sep 20/12  Kristin Shaw University of Toronto 
Obstructions to approximating tropical curves in surfaces 
Sep 13/12  Owen Baker McMaster University 
Hyperbolic group boundaries and CannonThurston maps 