Cyril Houdayer

collaborators

3 papers

math.OA2026

Weyl groups and rigidity of von Neumann algebras

Cyril Houdayer, Adrian Ioana

Let $G$ be a noncompact semisimple algebraic group with trivial center, $S < G$ a maximal split torus, $H < G$ the centralizer of $S$ in $G$ and $I^ < G$ an irreducible lattice. Con…

math.OA2026

Uniqueness of almost periodic outer flows on the hyperfinite type $II_{1}$ factor

Cyril Houdayer, Amine Marrakchi

We show that any almost periodic outer flow $I^\pm : R ↷ R$ on the hyperfinite type $II_{1}$ factor with Connes' spectrum $I^ (I^\pm) = R$ satisfies t…

math.DS2025

Strong primeness for equivalence relations arising from Zariski dense subgroups

Daniel Drimbe, Cyril Houdayer

We show that orbit equivalence relations arising from essentially free ergodic probability measure preserving actions of Zariski dense discrete subgroups of simple algebraic groups…

Weyl groups and rigidity of von Neumann algebras

Uniqueness of almost periodic outer flows on the hyperfinite type II1​ factor

Strong primeness for equivalence relations arising from Zariski dense subgroups

Uniqueness of almost periodic outer flows on the hyperfinite type $II_{1}$ factor