Author Archive: raphy

Place: Room 614 in the Education & Sciences Building Time: 14:00   Abstract: A king-non-attacking permutation is a permutation $\pi \in S_n$ such that $|\pi(i)-\pi(i-1)|\neq 1$ for each $i \in \{2,\dots,n\}$. We investigate the structure of the poset of these permutations under…
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  Place: Room 614 in the Education & Sciences Building Time: 14:00   Abstract:   Hyperbolic manifolds play an important role in geometry and topology, and in the 1980s Gromov introduced a notion of large-scale negative curvature that is strong enough to…
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Place: Room 614 in the Education & Sciences Building Time: 14:00 Abstract: In this talk I will start by a gentle introduction of non-singular actions and ergodic theory. After that we will discuss some recent progress, which culminated in a…
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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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