Séminaires : Séminaire de Logique Lyon-Paris

Equipe(s) : lm,
Responsables :S. Anscombe, O. Finkel, A. Khélif, S. Rideau, T. Tsankov, A. Vignati
Email des responsables :
Salle : Contacter Silvain Rideau ou Alessandro Vignati
Adresse :
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Orateur(s) Denis Osin - Vanderbilt University,
Titre A topological zero-one law and elementary equivalence of finitely generated groups
Date18/11/2020
Horaire16:00 à 17:15
Diffusion https://u-paris.zoom.us/rec/share/a4tx1Lb7BI3wF_dM-1I759pQ4pnOvjfaB_Fhiihs-AWXTKsL5yjeQKFo_FcbPKPq.cjNFf_LDVZFP-Inx
RésumeThe space of finitely generated marked groups, denoted by G, is a locally compact Polish space whose elements are groups with fixed finite generating sets; the topology on G is induced by the local convergence of the corresponding Caley graphs. We will discuss equivalent characterizations of closed subspaces S of G satisfying the following zero-one law: for any sentence sigma in the infinitary logic L_{\omega_1, \omega}, the set of all models of sigma in S is either meager or comeager. In particular, this zero-one law holds for certain natural spaces associated to hyperbolic groups and their generalizations. We will also discuss some open problems.
SalleContacter Silvain Rideau ou Alessandro Vignati
Adresse
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