A reminder: this is today.
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On 2024-10-21 12:09, Mykhaylo Tyomkyn wrote:
Dear all,
There will be a noon seminar this Thursday, 24 October, given by Robert Sullivan. Please find the talk details below.
Best regards, Misha Tyomkyn.
Universal automorphism groups and canonical amalgams Robert Sullivan Charles University October 24, 2024, 12:20 in S6
Abstract Let M be a countable ultrahomogeneous structure (e.g. Q or the random graph), and let A be a structure which is embeddable in M. We will discuss when it is possible to find a "nice" embedding of A into M, where "nice" means that each automorphism of A extends to an automorphism of M in a way that respects composition (giving a group embedding Aut(A) to Aut(M)).
We will present some general theorems and nice examples (e.g. the generic ordered graph, generic two-graph and generic 3-hypertournament). This project is joint work with Aleksandra Kwiatkowska and Jeroen Winkel.
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