Unitaires multiplicatifs en dimension finie et leurs sous-objets

Saad Baaj, Etienne Blanchard, Georges Skandalis

A pre-subgroup of a multiplicative unitary $V$ on a finite dimensionnal Hilbert space $H$ is a vector line $L$ in $H$ such that $V(L\otimes L)=L\otimes L$. We show that there are f…