Monthly Archives: October 2025

Kazhdan Seminar fall 2025 – Starting Today Oct. 19, 2026.

Posted on October 19, 2025 by Gil Kalai

This semester as a part of Kazhdan Sunday seminars we will have the following two activities (see description below) 12-14 Nati Linial and Yuval Peled,  “Recent advances in combinatorics” 14-16 Jake Solomon “Curve counts and quadratic forms”.  Both seminars will take … Continue reading →

Posted in Combinatorics, Geometry, Updates | Tagged , , , | 1 Comment

Explicit Lossless Vertex Expanders!

Posted on October 10, 2025 by Gil Kalai

(from left to right): Beth Samuels, Uzi Vishne, Alex Lubotzky, and Winnie Li Jun-Ting Hsieh, Alexander Lubotzky, Sidhanth Mohanty, Assaf Reiner, and Rachel Yun Zhang, Explicit Lossless Vertex Expanders Abstract: We give the first construction of explicit constant-degree lossless vertex expanders. Specifically, for … Continue reading →

Posted in Algebra, Combinatorics, Computer Science and Optimization | Tagged , , , , , , | Leave a comment