Colloquium

The weekly colloquium features a talk by an invited speaker. Topics vary and include all areas of mathematics.

Unless otherwise noted, the colloquium takes place on Tuesdays, 14:00 in room 614, 6’th floor of the Science and Education Building. For further details, please contact the colloquium coordinator, Dr. Adam Dor-On.

Colloquium: Tuesday, May 7, 2019. Speaker: Yotam Smilansky (Hebrew University). Title: “Multiscale substitution schemes and Kakutani sequences of partitions”.

Author: raphy May 15, 2019

Place: Room 614 in the Education & Sciences Building Time: 14:00 Abstract: Substitution schemes provide a classical method for constructing tilings of Euclidean space. Allowing multiple scales to appear in the substitution rule we define “multiscale substitution schemes” and study…
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Colloquium

Colloquium: Tuesday, May 14, 2019. Speaker: Ron Holzman (Technion). Title: “On partitions of a box into sub-boxes”.

Author: raphy May 15, 2019

Place: Room 614 in the Education & Sciences Building Time: 14:00 Abstract: We prove two theorems on the minimum number of sub-boxes in a partition of a box satisfying certain constraints. One is an old joint result with Alon, Bohman…
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Colloquium

Colloquium: Tuesday, April 16, 2019. Speaker: Ruben Jakob (Giessen University). Title: “Global existence and convergence of the Möbius invariant Willmore Flow in the 3-sphere”.

Author: raphy April 15, 2019

Place: Room 614 in the Education & Sciences Building Time: 14:00 Tea will be served before the talk (at 13:50).

Colloquium

Colloquium: Tuesday, April 2, 2019. Speaker: Ohad Feldheim (Hebrew University). Title: “Lattice models of magnetism: from magnets to antiferromagnets”.

Author: raphy April 1, 2019

Place: Room 614 in the Education & Sciences Building Time: 14:00 Abstract: The Ising model, and its generalisation, the Potts model, are two classical graph-colouring models for magnetism and antiferromagnetism. Albeit their simple formulation, these models were instrumental in explaining many…
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Colloquium

Colloquium: Tuesday, March 26, 2019. Speaker: Leonid Polterovich (Tel Aviv). Title: “Quantum footprints of symplectic rigidity”.

Author: raphy March 25, 2019

Place: Room 614 in the Education & Sciences Building Time: 14:00 Abstract: We discuss interactions between quantum mechanics and symplectic topology including a link between symplectic displacement energy, a fundamental notion of symplectic dynamics, and the quantum speed limit, a…
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Colloquium

Colloquium: Tuesday, March 19, 2019. Speaker: Spencer Unger (Hebrew University). Title: “A constructive solution to Tarski’s circle squaring problem”.

Author: raphy March 18, 2019

Place: Room 614 in the Education & Sciences Building Abstract: In 1925, Tarski asked whether a disk in R^2 can be partitioned into finitely many pieces which can be rearranged by isometries to form a square of the…
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Colloquium

Colloquium: Tuesday, March 12, 2019. Speaker: Eli Berger (Haifa). Title: “Hypergraph matching, rainbow matching, topology and games”.

Author: raphy March 7, 2019

Place: Room 614 in the Education & Sciences Building Time: 14:00 Abstract: Consider a 3-partite hypergraph with three sides V1, V2, V3. We want to find sufficient conditions for the existence of a matching in which all vertices of V1…
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Colloquium

Colloquium: Tuesday, March 5, 2019. Speaker: Ilan Hirshberg (Ben-Gurion). Title: “Regularity properties of simple C-algebras and C-dynamical systems”.

Author: raphy March 1, 2019

Place: Room 614 in the Education & Sciences Building Time: 14:00 Abstract: In this talk, I will survey recent developments in Elliott’s classification program for simple C*-algebras, and related regularity properties for dynamical systems. The talk will be aimed at…
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Colloquium

Colloquium: Tuesday, January 15, 2019. Speaker: Ilya Tyomkin (Ben-Gurion). Title: “A linearization of algebraic geometry”.

Author: raphy January 13, 2019

In the past 15 years, a new method of linearization of algebraic varieties was developed. The method, called tropicalization, associates to algebra-geometric objects over a valued field certain piecewise linear objects satisfying some harmonicity conditions. In my talk, I will…
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Colloquium

Colloquium: Tuesday, January 1, 2019. Speaker: Karim Adiprasito (Hebrew University). Title: “From Hall’s marriage theorem to algebraic geometry (and back to combinatorics)”.

Author: raphy December 27, 2018

We discuss how something remarkably similar to Hall’s marriage theorem appears naturally in context of a conjecture of Grothendieck in algebraic geometry, and how this is useful to prove some long-standing problems in discrete geometry. For instance, I will prove…
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Colloquium

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