Algebra, Combinatorics, and Geometry Archives
Date  Speakers  

Thursday, March 7, 2019  12:00 to 13:00

MultiplicityFree Products of Schubert Divisors and an Application to Canonical Dimension 
Rostislav Devyatov
University of Alberta

Thursday, February 14, 2019  12:00

Atiyah Class and Sheaf Counting on Local CalabiYau Fourfolds 
Artan Sheshmani
Harvard University, Center for Mathematical Sciences and Applications

Thursday, December 6, 2018  12:00

Hyperplane Arrangements and Compactifying the Milnor Fiber 
Jeremy Usatine
Yale University

Thursday, November 29, 2018  13:00 to 14:00

Toward double affine flag varieties and Grassmannians 
Dinakar Muthiah
Kavli IPMU Tokyo

Thursday, November 29, 2018  12:00

Toric degenerations of the algebra of conformal blocks and compactifications of character varieties 
Chris Manon
University of Kentucky

Thursday, November 15, 2018  12:00

Geometric approach to linear ODEs 
Dima Arinkin

Thursday, November 8, 2018  12:00

A Verified ODE Solver and Smale's 14th Problem 
Fabian Immler
Carnegie Mellon University

Thursday, October 25, 2018  12:00

Singular Fano Varietes 
Alexander Borisov

Thursday, October 18, 2018  12:00

Cubical sets and higher category theory 
Chris Kapulkin
University of Western Ontario

Thursday, October 11, 2018  12:00

On the statement of the classification of finite simple groups. 
Thomas Hales

Thursday, October 4, 2018  12:00

Coherent Satake Functor 
Roman Fedorov

Thursday, September 27, 2018  12:00

Character variety methods in 3manifold topology 
Jason DeBlois

Thursday, September 20, 2018  12:00

Cartan decomposition and Korbits in spherical varieties 
Kiumars Kaveh

Thursday, April 19, 2018  12:00

Counting cusp forms on Sp(4) 
Mahdi Asgari
Oklahoma State University

Thursday, April 12, 2018  12:00

Virtual GelfandZetlin Polytopes 
Elise Villella

Thursday, April 5, 2018  12:00

The real projective spaces in homotopy type theory 
Egbert Rijke
Carnegie Mellon University

Thursday, March 15, 2018  13:00

Combinatorics of canonical bases and cluster duality 
Bea Schumann

Thursday, March 1, 2018  12:00

Algebraic structures from dependent type theory 
Clive Newstead
Carnegie Mellon University

Thursday, February 22, 2018  12:00

Macdonald polynomial operators and coinvariant rings 
James Haglund
University of Pennsylvania

Thursday, February 15, 2018  13:00

Toric vector bundles and buildings  
Thursday, February 8, 2018  12:00

Koszul blowup algebras associated to threedimensional Ferrers diagrams 
KueiNuan Lin
Penn State University

Tuesday, January 30, 2018  12:00

The Fourier Coefficients of a Minimal Parabolic Eisenstein Series on the Double Cover of GL(3) over Q. 
Edmund Karasiewicz
University of California, Santa Cruz

Thursday, December 7, 2017  12:00

Computing with higher genus curves, abelian varieties and K3 surfaces  
Thursday, November 30, 2017  12:00

Scalingrotation statistics on symmetric positive definite matrices 
Sungkyu Jung
University of Pittsburgh

Thursday, November 16, 2017  12:00

Consequences of the Uniform Position Principle for Spanning Lattice Polytopes 
Johannes Hofscheier
McMaster University

Thursday, November 9, 2017  12:00

Mining ultraproduct proofs for bounds in polynomial rings 
William Simmons
University of Pennsylvania

Thursday, November 2, 2017  13:00

BottSamelson varieties 
Laura Escobar
UIUC

Thursday, October 26, 2017  12:00

Formal Abstracts in Mathematics  
Thursday, October 19, 2017  12:00

Integrating over Hilbert schemes 
Andras Szenes

Thursday, October 12, 2017  12:00

Convolution numbers  
Thursday, October 5, 2017  12:00

Ranks of matrices with few distinct entries 
Boris Bukh
Carnegie Mellon University

Thursday, September 28, 2017  13:00

Linear families of polytopes and a notion of anticanonical class  
Thursday, September 21, 2017  12:00

Formalized Spectral Sequences in Homotopy Type Theory II 
Floris van Doorn
Carnegie Mellon University

Thursday, September 14, 2017  12:00

Formalized Spectral Sequences in Homotopy Type Theory I 
Floris van Doorn
Carnegie Mellon University

Thursday, September 7, 2017  12:00

Toric degenerations of Projective Varieties  
Thursday, April 13, 2017  12:00 to 13:00

Looking for Keller maps: a report on the hunt 
Alexander Borisov

Thursday, April 6, 2017  12:00 to 13:00

Multiple zeta values and multiple Hurwitzzeta values. Analytic and combinatorial aspects 
Cezar Lupu
University of Pittsburgh

Thursday, March 16, 2017  12:00 to 13:00

Curves on algebraic surfaces and hyperbolic codes 
Matt Stover
Temple University

Thursday, March 2, 2017  12:00

Congruence group actions on 2affine braid groups 
Bogdan Ion

Thursday, February 23, 2017  12:00

naffine braid groups 
Bogdan Ion

Thursday, February 9, 2017  12:00

Reinhardt conjecture as a problem in optimal control theory 
Thomas Hales

Thursday, January 26, 2017  12:00

Motivic class of moduli of Higgs bundles, Part 2  
Thursday, January 19, 2017  12:00

Motivic class of moduli of Higgs bundles  
Thursday, November 10, 2016  12:00 to 13:00

A geometric perspective on Landau's theorem in function fields 
Vlad Matei
University of WisconsinMadison

Thursday, October 27, 2016  12:00

The fundamental lemma for Hecke algebras in large positive characteristic  
Thursday, October 20, 2016  12:00

Quantitative Characterization of Finite Simple Groups and Related Topics 
Wujie Shi
Chongqing University of Arts & Sciences and Suzhou University

Thursday, October 13, 2016  12:00

Geometry of planar surfaces and exceptional fillings 
Neil Hoffman
Oklahoma State University

Thursday, October 6, 2016  12:00

Optimal partition problems 
Marco Caroccia
Carnegie Mellon University

Tuesday, September 20, 2016  12:00

Real, padic, and motivic (oscillatory) integrals and applications 
Raf Cluckers
CRNS (Le Centre national de la recherche scientifique), France

Thursday, September 15, 2016  12:00

Algebraic tori and counting padic fields  
Thursday, September 8, 2016  12:00

The optimal packing of congruent regular pentagons in the plane  
Thursday, August 25, 2016  12:00

Configurations of Spheres 
Woden Kusner
Graz University of Technology

Thursday, April 21, 2016  12:00

The representation problem for ternary quadratic polynomials. 
Anna Haensch
Duquesne University

Thursday, April 14, 2016  12:00

Cubical sets with symmetries and the homotopy coherent nerve functor 
Chris Kapulkin

Thursday, March 31, 2016  12:00

Fisher information and the discrete Laplacian, with applications  
Thursday, March 24, 2016  12:00

Tropical geometry and Grobner theory for spherical homogeneous spaces  
Thursday, March 17, 2016  12:00

Generalized Riemannian geometry  
Thursday, March 3, 2016  12:00 to 13:00

Noncommutative Symmetric Groups in Noncommutative Projective Algebraic Geometry 
Xingting Wang
Temple University

Thursday, February 25, 2016  12:00

Springer Waction and equivariant cohomology  
Thursday, January 14, 2016  13:00 to 14:00

Affine Lie algebras, quantum Ktheory, and combinatorics 
Cristian Lenart
SUNY Albany

Tuesday, December 15, 2015  12:00

Congruent relations, cyclotomic expansion and volume conjecture for SU(n) invariants 
Shengmao Zhu
Zhejiang University

Thursday, December 10, 2015  12:00 to 13:00

Systoles of arithmetic hyperbolic manifolds 
Ben McReynolds
Purdue

Thursday, December 3, 2015  12:00

Bergman kernel and invariant theory  
Thursday, November 19, 2015  12:00

Special complex structures and their deformation properties: Hodge numbers and stability 
Sheng Rao
University of California, Los Angeles

Thursday, November 12, 2015  12:00

Commutative Character Sheaves  
Thursday, November 5, 2015  12:00

Hilbert schemes and parking functions 
Andrei Neguț
MIT

Thursday, October 22, 2015  12:00

The representation theory of sphere packings  
Thursday, October 15, 2015  12:00

The Kudla Program 
Zavosh AmirKhosravi

Thursday, October 8, 2015  12:00

Toric degenerations and symplectic geometry of projective varieties II  
Thursday, October 1, 2015  12:00

Toric degenerations and symplectic geometry of projective varieties  
Thursday, October 1, 2015  12:00

Toric degenerations and symplectic geometry of projective varieties 
<p>The purpose of this talk is to discuss some recent general results about symplectic geometry of smooth projective varieties using toric degenerations (motivated by commutative algebra). The main result is the following: Let X be a smooth ndimensional complex projective variety embedded in a projective space and equipped with a Kahler structure induced from a FubiniStudy Kahler form. We show that for any \epsilon>0 the manifold X has an open subset U (in the usual topology) such that vol(X \ U) < \epsilon and moreover U is symplectomorphic to the algebraic torus (\C^*)^n equipped with a toric Kahler form. The proof is based on construction of a toric degeneration of X. As applications we obtain lower bounds on the Gromov width of X. Moreover, we show that X has a full symplectic ball packing by d balls of capacity 1 where d is the degree of X.</p>
4

Thursday, September 24, 2015  12:00

On the Schwartz space of a smooth semialgebraic stack 
Yiannis Sakellaridis
Rutgers University

Thursday, September 24, 2015  12:00

On the Schwartz space of a smooth semialgebraic stack 
Yiannis Sakellaridis
Rutgers University

Thursday, September 10, 2015  12:00

Computing padic families of modular symbols  
Thursday, April 2, 2015  12:00

Introduction to factorization homology 
Chris Kapulkin
University of Western Ontario

Thursday, April 2, 2015  12:00

Introduction to factorization homology 
Chris Kapulkin
University of Western Ontario

Thursday, March 26, 2015  12:00

Tautological ring of moduli spaces of curves  
Thursday, March 19, 2015  12:00

Macdonald conjectures for multivariate hypergeometric functions 
Siddhartha Sahi
Rutgers University, New Brunswick

Thursday, March 19, 2015  12:00

Macdonald conjectures for multivariate hypergeometric functions 
Siddhartha Sahi
Rutgers University, New Brunswick

Tuesday, March 17, 2015  12:00

Generalized Whittaker functionals for real reductive groups 
Siddhartha Sahi
Rutgers University, New Brunswick

Thursday, March 5, 2015  12:00

Stability conditions for subquotients of category O 
Vinoth Nandakumar
MIT

Wednesday, February 25, 2015  12:00

Springer Waction and equivariant cohomology  
Thursday, February 19, 2015  12:00

The 290Theorem and Representing Numbers by Quadratic Forms 
Jonathan Hanke

Thursday, February 5, 2015  12:00

The maximum injectivity radius of hyperbolic 2orbifolds 
Federica Fanoni
University of Fribourg

Thursday, January 29, 2015  12:00

Serre's tensor construction and moduli of abelian schemes  Part 2 
Zavosh AmirKhosravi
4

Thursday, January 29, 2015  12:00

Serre's tensor construction and moduli of abelian schemes  Part 2 
Zavosh AmirKhosravi

Thursday, January 22, 2015  12:00

Serre's tensor construction and moduli of abelian schemes 
Zavosh AmirKhosravi

Thursday, January 15, 2015  12:00

Tropical geometry  
Thursday, December 4, 2014  12:00

Genus of complete intersections and EhrhartMacdonald reciprocity for convex polytopes 2 
University of Pittsburgh

Thursday, November 20, 2014  12:00

An affine quantum cohomology ring and periodic Toda lattice 
Leonardo Mihalcea
Virginia Tech

Thursday, November 13, 2014  12:00

Genus of complete intersections and EhrhartMacdonald reciprocity for convex polytopes 1 
University of Pittsburgh

Thursday, November 13, 2014  12:00

Genus of complete intersections and EhrhartMacdonald reciprocity for convex polytopes 1 
<p>I will describe the beautiful EhrhartMacdonald theorem which connects number of integral points in a convex polytope $\Delta$ and the number of integral points strictly inside $\Delta$. I will discuss the relation with Serre duality in algebraic geometry and finally show how one can use this to compute genus of complete intersections in smooth toric varieties. In a recent work (in progress, joint with A. G. Khovanskii) we generalize this to the socalled spherical varieties of any connected reductive group G. I will try to explain most of the necessary background.</p>
University of Pittsburgh

Tuesday, November 4, 2014  11:00

Newtontype diagrams for singular flags and counting number of solutions of polynomials 
Pinaki Mondal
Weitzman Institute of Science

Thursday, October 30, 2014  12:00

Hadean numbers  exploring the underworld of reduced plane algebraic curves 
Brian Harbourne
University of NebraskaLincoln

Thursday, October 23, 2014  12:00

The socle, lattice of normal subgroups, and faithful irreducible characters 2 
University of Pittsburgh

Thursday, October 16, 2014  12:00

The socle, lattice of normal subgroups, and faithful irreducible characters 1 
<p>A study of the Mobius function on the lattice of normal subgroups yields information of the number of conjugacy classes required to generate a finite group. It is shown how this number is reflected in the character table. A result of Geschutz states that faithful irreducible characters exist if and only if the socle is generated by a sole conjugacy class. By studying all faithful irreducible characters, generalizations of this result are presented. Faithful irreducible characters are shown to be orthogonal modulo the socle of the group. This leads, in particular, to information on the structure constants of the socle.</p>
University of Pittsburgh

Thursday, October 16, 2014  12:00

The socle, lattice of normal subgroups, and faithful irreducible characters 1 
University of Pittsburgh

Thursday, October 9, 2014  12:00

Homotopy and homology of moduli spaces of elliptic curves 2 
University of Pittsburgh

Thursday, October 2, 2014  12:00

Homotopy and homology of moduli spaces of elliptic curves 1 
University of Pittsburgh

Thursday, April 17, 2014  12:00

RankinSelberg Theory of Lfunctions 
Mahdi Asgari
