# Events & Seminars

# HD-Combinatorics: Special day on group stability

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This special day is part of several Mondays that will be dedicated to stability in group theory

09:00 - 11:00

**Alex Lubotzky**, "Group stability and approximation"

14:00 - 16:00

**Lev Glebsky**, "Stability and second cohomology"

# Dynamics Lunch: Jasmin Matz (Huji) ״Distribution of periodic orbits of the horocycle flow״

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# Special Talk : W Chacholski (Copenhagen) - "What is persistence?"

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# Basic Notions - Alex Lubotzky: "Group stability and approximation"

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# Barak Weiss (TAU): New examples for the horocycle flow on the moduli space of translation surfaces

# Combinatorics: Roman Glebov (HU) "Perfect Matchings in Random Subgraphs of Regular Bipartite Graphs"

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# Combinatorics: Chris Cox (CMU) "Nearly orthogonal vectors"

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# Combinatorics -- Erdos lecture cancelled; instead (NOTE THE TIME!) :

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# Combinatorics: Daniel Jerison (TAU) "Random walks on sandpile groups"

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Title: Random walks on sandpile groups

Abstract:

# High-Dim Combinatorics: Stefan Glock, "Designs via iterative absorption"

# NT&AG: Max Gurevich (University of Singapore), "Branching laws for non-generic representations"

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# GAME THEORY AND MATHEMATICAL ECONOMICS RESEARCH SEMINAR:Michal Feldman, Tel Aviv University "Interdependent Values without Single-Crossing (Joint work with Alon Eden, Amos Fiat and Kira Goldner)"

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Abstract:

We consider a setting where an auctioneer sells a single item to n potential agents with {\em interdependent values}. That is, each agent has her own private signal, and the valuation of each agent is a function of all n private signals. This captures settings such as valuations for oil fields, broadcast rights, art, etc. Read more about GAME THEORY AND MATHEMATICAL ECONOMICS RESEARCH SEMINAR:Michal Feldman, Tel Aviv University "Interdependent Values without Single-Crossing (Joint work with Alon Eden, Amos Fiat and Kira Goldner)"

# Special Talk : Justin Noel (University of Regensburg) - "Blue-shift and thick tensor ideals"

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Abstract:

I will discuss a recent generalization of Kuhn's Blue-shift theorem about Tate cohomology. Combining this result with work of Arone, Dwyer, and Lesh we resolve a conjecture of Balmer and Sanders and classify the thick tensor ideals of compact genuine $A$-spectra, where $A$ is a finite abelian group. This is joint work with Tobias Barthel, Markus Hausmann, Niko Naumann, Thomas Nikolaus, and Nathaniel Stapleton.