Week of 19 October 2014 Mathematics Seminars



Geometry of moduli spaces of coherent sheaves on toric surfaces and threefolds

Thursday, October 23, 2014 at 3:30p.m.
Amin Gholampour (University of Maryland)
Abstract: We explain how toric methods can be used to explore the geometry of moduli spaces of coherent sheaves. In particular, we review the methods of getting combinatorial expressions for Euler characteristics and Poincare polynomials of some of these moduli spaces. We apply these to the moduli spaces of rank 1 and rank 2 torsion free sheaves on weighted projective planes and express the generating function of Euler characteristics in terms of modular forms. We will talk about some applications in the case of moduli spaces on toric 3-folds if time allows.

Monday, 20 October 2014

Topology Seminar

Maurer-Cartan elements and natural operations at 2:30p.m. in VinH 570
Benjamin Ward (Simons Center for Geometry and Physics, Stony Brook University)
The process of twisting by a Maurer-Cartan element in an operadic context produces cochain complexes computing, for example, the Chevalley-Eilenberg cohomology of a Lie algebra, ... (more)

Automorphic Forms and Number Theory

[postponed] at 3:35p.m. in 206 Vincent Hall

Tuesday, 21 October 2014

Climate Seminar

Proposed effects of early agriculture on current climate at 11:15a.m. in VinH 570
Elise Reed (U of M Mathematics Department)

Combinatorics Study Group

Topics in Combinatorics Study Group at 1:25p.m. in VinH 203A

Geometric Analysis Learning Seminar

Definition of the center of mass at 3:30p.m. in VinH 206
Pak Yeung Chan (U of M Mathematics Department)

Wednesday, 22 October 2014

Math Physics Seminar

Diagnosing Cancer with Signature Curve Symmetry at 12:20p.m. in VinH 570
Anna Grim (St. Thomas)
Mammography persists as a challenge in radiology because the structural differences between benign and malignant tumors are indistinguishable to the human eye. However, the application ... (more)

Student Stochastic Seminar

Concentration of measure at 2:00p.m. in VinH 570
Piotr Nayar (IMA)
My goal during this talk will be to present some basic theorems and techniques related to concentration of measure phenomenon. We will consider product probability ... (more)

Algebraic Geometry

Rank 2 Donladson-Thomas theory vertex at 2:30p.m. in Vincent Hall 313
Amin Gholampour ((University of Maryland))
We study the geometry of moduli space of rank 2 torsion free sheaves on toric 3-folds. As an outcome we develop a vertex theory for ... (more)

Reading Seminar on Automorphic Forms

A theorem of Harish-Chandra at 3:30p.m. in VinH 209
Mr. Andrew Senger (UMN)

Topology Seminar

Configurations spaces and symmetric complements at 3:30p.m. in Vincent Hall 203A
TriThang Tran (University of Oregon)
In this talk, we discuss homological stability for spaces that are defined as the complements of the closures of certain strata in the n-fold symmetric ... (more)

Student Symplectic and Low Dimensional Topology Seminar

Primitive cohomologies on compact symplectic manifolds at 3:35p.m. in VinH 2
Heidi Andersen (U of M Mathematics Department)
Primitive cohomologies on compact symplectic manifolds are defined, and properties (such as finite-dimensionality) explored. These provide new symplectic invariants, as they are distinct from the ... (more)

Thursday, 23 October 2014

SIAM Student Chapter Reading Group Seminar

An introduction to frames in finite dimensions at 11:00a.m. in VinH 570
Alex Gutierrez (U of M Mathematics Department)
Christensen's "Frames and Bases: An Introductory Course"

Commutative Algebra Seminar

Matis duality, D-modules, and the Hodge-de Rham spectral sequences for complete local rings III at 11:15a.m. in VinH 203A
Nicholas Switala (U of M Mathematics Department)

Math Club Seminar

Aztec Diamond Theorem at 12:20p.m. in VinH 570
Thomas McConville (University of Minnesota)

Differential Geometry / Symplectic Topology Seminar

New Exotic 4-manifolds via Luttinger surgery on Lefschetz fibrations at 1:25p.m. in VinH 570
Nur Saglam (U of M Mathematics Department)
: In this talk, we will present a new construction of symplectic 4-manifolds homeomorphic but not diffeomorphic to (2n+2k-3)CP^2#(6n+2k-3)(-CP)^2 via Luttinger surgery. If time permit, ... (more)


Geometry of moduli spaces of coherent sheaves on toric surfaces and threefolds at 3:30p.m. in VinH 16
Amin Gholampour (University of Maryland)
We explain how toric methods can be used to explore the geometry of moduli spaces of coherent sheaves. In particular, we review the methods of ... (more)

Friday, 24 October 2014

Combinatorics Problem Session

All are welcome to pose a short combinatorics problem, or discuss problems posed by others at 2:30p.m. in VinH 570
to be announced

Probability Seminar

Stochastic block models and planted CSP's at 2:30p.m. in VinH 207
Will Perkins (IMA)
A stochastic block model is a random graph with edge probabilities that differ according to how an edge crosses a planted partition of the vertex ... (more)

Lie Theory Seminar

Higher Koecher's principle, II at 3:30p.m. in VinH 209
Professor Kai-Wen Lan (U of M Mathematics Department)
This is a continuation of the previous week's talk.

Combinatorics Seminar

Adinkras: Progress and Problems at 3:35p.m. in VinH 570
Yan Zhang (UC Berkeley)
Adinkras are graphical tools created for the study of representations in supersymmetry that turn out to contain many connections with graded posets, the Tutte polynomial, ... (more)

MCFAM Seminar

Quant Finance and Analytics Career Fair at 5:00p.m. in Mississippi Room, 3rd Floor of Coffman Union