Calendar
Calendar
Posted April 21, 2026
12:30 pm – 1:30 pm Keisler Lounge
Stefan Wild, Lawrence Berkeley National Laboratory
TBD
TBD
Event contact: Maganizo Kapita, Laura Kurtz
Posted March 6, 2026
Last modified April 16, 2026
Applied Analysis Seminar Questions or comments?
3:30 pm 233 Lockett Hall
Yunfeng Zhang, University of Cincinnati
Bilinear Eigenfunction Estimate, Anisotropic Strichartz Estimate, and Energy-Critical NLS
We prove global well-posedness for the energy-critical nonlinear Schrödinger equation on the product manifold R × S^3 with small initial data in the energy space. The first key ingredient is a sharp bilinear eigenfunction estimate for the Laplace operator on S^3, which completes the theory of multilinear eigenfunction estimates on spheres pioneered by Burq, Gérard, and Tzvetkov. Our approach relies on representation theory. The second key ingredient is a frequency-localized anisotropic Strichartz estimate on the cylinder R × T, the proof of which relies on precise measure estimates. This is joint work with Yangkendi Deng and Zehua Zhao.
Event contact: Xiaoqi Huang
Posted April 21, 2026
Algebra and Number Theory Seminar Questions or comments?
2:00 pm – 3:00 pm Lockett 233 or click here to attend on Zoom
Mengwei Hu, Yale University
On certain Lagrangian subvarieties in minimal resolutions of Kleinian singularities
Kleinian singularities are quotients of C^2 by finite subgroups of SL_2(C). They are in bijection with the ADE Dynkin diagrams via the McKay correspondence. In this talk, I will introduce certain singular Lagrangian subvarieties in the minimal resolutions of Kleinian singularities, motivated by the geometric classification of unipotent Harish-Chandra (g,K)-modules. The irreducible components of these singular Lagrangian subvarieties are P^1's and A^1's. I will describe how they intersect with each other through the realization of Kleinian singularities as Nakajima quiver varieties. I will also discuss their connections with nilpotent K-orbits and symmetric pairs in semisimple Lie algebras.
Posted April 8, 2026
Informal Analysis Seminar Questions or comments?
12:30 pm – 1:30 pm Lockett 233
Jackson Knox, Louisiana State University
Tbd
Tbd
Posted January 15, 2026
Informal Geometry and Topology Seminar Questions or comments?
3:30 pm – 4:30 pm Lockett Hall 233
Huong Vo, Louisiana State University
TBD
TBD
Posted January 24, 2026
Control and Optimization Seminar Questions or comments?
10:30 am – 11:20 am Note the Special Seminar Time. Zoom (click here to join)
Michael Friedlander, University of British Columbia
SIAM Fellow
Seeing Structure Through Duality
Duality is traditionally introduced as a source of bounds and shadow prices. In this talk I emphasize a second role: revealing structure that enables scalable computation. Starting from LP complementary slackness, I describe a generalization called polar alignment that identifies which "atoms" compose optimal solutions in structured inverse problems. The discussion passes through von Neumann's minimax theorem, Kantorovich's resolving multipliers, and Dantzig's simplex method to arrive at sublinear programs, where an adversary selects worst-case costs from a set. The resulting framework unifies sparse recovery, low-rank matrix completion, and signal demixing. Throughout, dual variables serve as certificates that decode compositional structure.