Colloquium

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

  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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  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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    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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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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  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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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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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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