Tue, 13 Oct 2026
16:00
L5

On minimal topological models for non-invariant measured actions

Tomer Zimhoni
(Ben Gurion University of the Negev)
Abstract

In 1989, Benjamin Weiss proved that for a countable group G, there exists a global minimal G-flow which is a topological model for every essentially free p.m.p. Borel G-action. In this talk, I will present our vast generalization, asserting that any essentially free Borel measured action (without the p.m.p. assumption), admits a minimal compact model. Moreover, we show that given a random walk on the group, there exists a global minimal topological model for all essentially free stationary Borel actions.

Based on joint work with Yair Hartman.

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Oxford’s Savilian Professors of Astronomy: The First 400 Years

To celebrate the publication in December 2025 of the book below, Steven Balbus (Savilian Professor 2012–24) and Robin Wilson are organising this one-day meeting at Green Templeton College in which the authors of this book and others will present the 400-year history of the Savilian Chair of Astronomy.

Wed, 03 Feb 2027

17:00 - 18:30
L6

tbc

Erika Luciano
(Università degli Studi di Torino)
Abstract

tbc

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1-Uryson width and covers
 Papazoglou, P Alpert, H Banerjee, A Mathematische Zeitschrift
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