Activation-Space Uncertainty Quantification for Pretrained Networks
Bergna, R
Depeweg, S
Calvo-Ordoñez, S
Plenk, J
Cartea, A
Hernández-Lobato, J
(23 Feb 2026)
Fri, 27 Mar 2026
16:00
16:00
L4
On indefinite ternary quadratic forms
Peter Sarnak
(IAS Princeton)
Abstract
We describe the solution to two problems concerning indefinite integral ternary quadratic forms. The first about anisotropic forms was popularized by Margulis following his solution of the Oppenheim Conjecture. The second about the density of isotropic forms was raised by Serre. Joint work with A. Gamburd, A. Ghosh and J. Whang.
Tue, 05 May 2026
16:00
16:00
L5
Joint moments of characteristic polynomials from the orthogonal and unitary symplectic groups
Keating, J
Assiotis, T
Gunes, M
Wei, F
Proceedings of the London Mathematical Society
Tue, 02 Jun 2026
16:00
16:00
L5
Wed, 20 May 2026
15:00
15:00
L4
Quantitative Orbit Equivalence for $\mathbb{Z}$-odometers
Spyridon Petrakos
(Gothenberg)
Abstract
It is known for a long time, due to a celebrated theorem of Ornstein and Weiss, that (classical/plain) orbit equivalence offers no information about ergodic probability measure preserving actions of amenable groups. On the other hand, conjugacy is too intractable, and effectively hopeless to study in full generality. Quantitative orbit equivalence aims to bridge this gap by adding intermediate layers of rigidity— a strategy that has borne fruit already in the late 1960s but was used as a general framework only semi-recently. In this talk, Spyridon Petrakos will introduce aspects of quantitative orbit equivalence and present a complete picture of it for integer odometers. This is joint work with Petr Naryshkin.