Calendar

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Today, Monday, February 17, 2025

Posted February 10, 2025

Applied Analysis Seminar Questions or comments?

3:30 pm Lockett 232

Hongki Jung, Louisiana State University
$\Lambda(p)$--subsets of manifolds

In 1989, Bourgain proved the existence of maximal $\Lambda(p)$--subsets within the collection of mutual orthogonal functions. We shall explore the Euclidean analogue of $\Lambda(p)$—sets through localization. As a result, we construct maximal $\Lambda(p)$--subsets on a large class of curved manifolds, in an optimal range of Lebesgue exponents $p$. This is joint work with C. Demeter and D. Ryou.

Wednesday, February 19, 2025

Posted February 3, 2025

Informal Geometry and Topology Seminar Questions or comments?

1:30 pm

Krishnendu Kar, Louisiana State University
TBD

Wednesday, February 19, 2025

Posted January 20, 2025
Last modified February 10, 2025

Harmonic Analysis Seminar

3:30 pm – 4:30 pm 232 Lockett Hall

Kabe Moen, University of Alabama
New perspectives on the subrepresentation formula

The classical subrepresentation formula establishes that a smooth function is bounded pointwise by the Riesz potential applied to its gradient. This fundamental inequality, combined with the mapping properties of the Riesz potential, leads to the celebrated Gagliardo-Nirenberg-Sobolev inequality, which plays a crucial role in analysis and partial differential equations. In this talk, we show a powerful extension of the subrepresentation formula to several prominent operators in harmonic analysis, including exotic cases such as rough singular integrals and spherical maximal functions. Additionally, we uncover some new structural properties of subrepresentation formulas, including an openness property and an equivalence with weighted Sobolev inequalities and isoperimetric inequalities.

Wednesday, February 19, 2025

Posted February 6, 2025
Last modified February 12, 2025

Geometry and Topology Seminar Seminar website

3:30 pm Lockett 233

Neal Stoltzfus, Mathematics Department, LSU
Discrete Laplacians, Ribbon Graphs, and Link Polynomials

The Whitney homology of the independence lattices of the state space of a ribbon graphs supports three independent anti-commuting discrete Laplacians. They relate to the three fundamental combinatorial invariants of independent subsets: rank, nullify and genus. We explore the combinations that give link invariants.

Friday, February 21, 2025

Posted December 23, 2024
Last modified January 10, 2025

Control and Optimization Seminar Questions or comments?

11:30 am – 12:20 pm Zoom (click here to join)

Carsten Scherer, University of Stuttgart, Germany IEEE Fellow
Robust Control and the Design of Controllers for Optimization

Recent years have witnessed a renewed interest in considering optimization algorithms as feedback systems. This viewpoint turns, for example, the analysis of the convergence properties of a first order algorithm into a problem of stability analysis of a Lure system. In this talk we highlight why advanced methods in robust control play a key role for developing unprecedented tools to analyze the convergence properties of first order algorithms for solving strongly convex programs. In contrast to alternative approaches, we reveal that the proposed avenue permits not only the analysis but also the systematic design of optimization algorithms using convex semi-definite programming.

Tuesday, February 25, 2025

Posted January 26, 2025

Algebra and Number Theory Seminar Questions or comments?

2:30 pm – 3:30 pm Lockett 233 or click here to attend on Zoom

Akio Nakagawa, Kanazawa University
TBA

Wednesday, February 26, 2025

Posted November 27, 2024
Last modified January 7, 2025

Student Colloquium

1:30 pm TBD

Dave Auckly, Kansas State University
TBD

Wednesday, February 26, 2025

Posted November 12, 2024
Last modified February 3, 2025

Student Colloquium

1:30 pm

Dave Auckly, Kansas State University
TBD

Wednesday, February 26, 2025

Posted January 14, 2025
Last modified February 3, 2025

Geometry and Topology Seminar Seminar website

3:30 pm

Dave Auckly, Kansas State University
TBD

Friday, February 28, 2025

Posted December 8, 2024

Control and Optimization Seminar Questions or comments?

11:30 am – 12:20 pm Zoom (click here to join)

John Baras, University of Maryland Fellow of AAAS, AMS, IEEE, and SIAM
TBA

Wednesday, March 5, 2025

Posted February 3, 2025

Informal Geometry and Topology Seminar Questions or comments?

1:30 pm

Huong Vo, Louisiana State University
TBD

Thursday, March 6, 2025

Posted November 21, 2024
Last modified February 13, 2025

Applied Analysis Seminar Questions or comments?

2:30 pm TBA

TBA

Thursday, March 6, 2025

Posted October 14, 2024
Last modified January 23, 2025

Applied Analysis Seminar Questions or comments?

3:30 pm – 4:30 pm Lockett 232

Alexandru Hening, Texas A&M University
TBA

Monday, March 10, 2025

Posted February 10, 2025

Mathematical Physics and Representation Theory Seminar

2:30 pm – 3:20 pm 233 Lockett Hall

David Boozer, Indiana University
TBA

Wednesday, March 12, 2025

Posted February 3, 2025

Informal Geometry and Topology Seminar Questions or comments?

1:30 pm

Emmanuel Astante, Louisiana State University
TBD

Wednesday, March 12, 2025

Posted February 10, 2025

Mathematical Physics and Representation Theory Seminar

2:30 pm – 3:20 pm Lockett 233

Maarten Mol, University of Toronto
TBA: Additional Topology/Rep Theory talk today

Friday, March 14, 2025

Posted December 22, 2024

Control and Optimization Seminar Questions or comments?

11:30 am – 12:20 pm Zoom (click here to join)

Serdar Yuksel, Queen’s University, Canada
TBA

Monday, March 17, 2025

Posted February 10, 2025

Mathematical Physics and Representation Theory Seminar

2:30 pm – 3:20 pm Monday, March 17, 0025 Lockett 233

Sam Gunningham, Montana State University
TBA

Tuesday, March 18, 2025

Posted January 28, 2025

Algebra and Number Theory Seminar Questions or comments?

2:30 pm – 3:30 pm Lockett 233 or click here to attend on Zoom

Eun Hye Lee, Texas Christian University
TBA

Wednesday, March 19, 2025

Posted February 3, 2025

Informal Geometry and Topology Seminar Questions or comments?

1:30 pm

Saumya Jain, Louisiana State University
TBD

Wednesday, March 19, 2025

Posted February 12, 2025

Student Colloquium

3:30 pm

TBD

Friday, March 21, 2025

Posted December 9, 2024

Control and Optimization Seminar Questions or comments?

11:30 am – 12:20 pm Zoom (click here to join)

Serkan Gugercin, Virginia Tech
TBA

Wednesday, March 26, 2025

Posted February 3, 2025

Informal Geometry and Topology Seminar Questions or comments?

1:30 pm

Peter Ramsey, Louisiana State University
TBD

Friday, March 28, 2025

Posted December 21, 2024

Control and Optimization Seminar Questions or comments?

11:30 am – 12:20 pm Zoom (click here to join)

Saber Jafarpour, University of Colorado
TBA

Thursday, April 3, 2025

Posted September 19, 2024
Last modified October 25, 2024

Colloquium Questions or comments?

3:30 pm Lockett 232

Bogdan Suceava, California State University Fullerton
TBD

Wednesday, April 9, 2025

Posted February 3, 2025

Informal Geometry and Topology Seminar Questions or comments?

1:30 pm

Adithyan Pandikkadan, Louisiana State University
TBD

Friday, April 11, 2025

Posted November 7, 2024

Control and Optimization Seminar Questions or comments?

11:30 am – 12:20 pm Zoom (click here to join)

Irena Lasiecka, University of Memphis AACC Bellman Control Heritage Awardee, AMS Fellow, SIAM Fellow, and SIAM Reid Prize Awardee
TBA

Friday, April 11, 2025

Posted January 21, 2025

Combinatorics Seminar Questions or comments?

3:30 pm – 4:30 pm Zoom Link

Joseph Bonin, George Washington University
Results on positroids from the perspective of structural matroid theory

A matroid of rank $r$ on $n$ elements is a positroid if it has a representation by an $r$ by $n$ matrix over $\mathbb{R}$ with the property that the determinant of each $r$ by $r$ submatrix is nonnegative. Positroids are commonly studied through the lens of algebraic combinatorics, where a fixed linear order on the ground set is regarded as part of the positroid. We focus on the matroid structure per se, without a priori fixing a linear order on the ground set. A number of earlier characterizations of positroids involve connected flats and non-crossing partitions; we provide a new characterization of a similar flavor and discuss some of its applications. One application is finding conditions under which two positroids can be glued together along a common restriction, in the freest way possible, to yield another positroid: for instance, if $M$ and $N$ are positroids and the intersection of their ground sets is an independent set and a set of clones in both $M$ and $N$, then the free amalgam of $M$ and $N$ is a positroid (that encompasses parallel connections and much more). Also, the class of positroids is minor-closed, and we identify many multi-parameter infinite families of excluded minors for this class, while more excluded minors remain to be discovered.

Tuesday, April 15, 2025

Posted January 26, 2025
Last modified February 12, 2025

Algebra and Number Theory Seminar Questions or comments?

2:30 pm – 3:30 pm Lockett 233 or click here to attend on Zoom

Kairi Black, Duke University
TBA

Wednesday, April 16, 2025

Posted February 3, 2025

Informal Geometry and Topology Seminar Questions or comments?

1:30 pm

Matthew Lemoine, Louisiana State University
TBD

Wednesday, April 16, 2025

Posted February 4, 2025
Last modified February 10, 2025

Geometry and Topology Seminar Seminar website

Lockett 233

Matthew Haulmark, Cornell University
TBA

Monday, April 21, 2025

Posted February 10, 2025

Mathematical Physics and Representation Theory Seminar

2:30 pm – 3:20 pm Lockett 233

Joshua Mundinger, University of Wisconsin
TBA

Wednesday, April 23, 2025

Posted February 3, 2025

Informal Geometry and Topology Seminar Questions or comments?

1:30 pm

Nilangshu Bhattacharyya, Louisiana State University
TBD

Wednesday, April 23, 2025

Posted January 27, 2025

Geometry and Topology Seminar Seminar website

3:30 pm Lockett 233

Galen Dorpalen-Barry, Texas A&M
TBA

Friday, April 25, 2025

Posted January 10, 2025

Control and Optimization Seminar Questions or comments?

11:30 am – 12:20 pm Zoom (click here to join)

Carolyn Beck, University of Illinois Urbana-Champaign IEEE Fellow
TBA

Monday, April 28, 2025

Posted December 10, 2024
Last modified January 5, 2025

Applied Analysis Seminar Questions or comments?

3:30 pm Lockett

Yuanzhen Shao, University of Alabama
Some recent developments in the study of magnetoviscoelastic fluids

In this talk, we consider the motion of a magnetoviscoelastic fluid in a nonisothermal environment. When the deformation tensor field is governed by a regularized transport equation, the motion of the fluid can be described by a quasilinear parabolic system. We will establish the local existence and uniqueness of a strong solution. Then it will be shown that a solution initially close to a constant equilibrium exists globally and converges to a (possibly different) constant equilibrium. Further, we will show that that every solution that is eventually bounded in the topology of the natural state space exists globally and converges to the set of equilibria. If time permits, we will discuss some recent advancements regarding the scenario where the deformation tensor is modeled by a transport equation. In particular, we will discuss the local existence and uniqueness of a strong solution as well as global existence for small initial data.

Wednesday, April 30, 2025

Posted January 12, 2025
Last modified January 16, 2025

Harmonic Analysis Seminar

3:30 pm Lockett 232

Zi Li Lim, UCLA
TBA

Wednesday, April 30, 2025

Posted January 23, 2025
Last modified January 27, 2025

Geometry and Topology Seminar Seminar website

3:30 pm Lockett 233

Annette Karrer, The Ohio State University
TBA

Friday, May 2, 2025

Posted January 16, 2025

Control and Optimization Seminar Questions or comments?

11:30 am – 12:20 pm Zoom (click here to join)

Bahman Gharesifard, Queen's University
TBA