Une ébauche d'une théorie générale des fonctions définies-négatives
Une remarque sur les inégalités de Littlewood-Paley sous l’hypothèse
Uniformly bounded representations of free groups.
Uniformly cyclic vectors
A group acting on a measure space (X,β,λ) may or may not admit a cyclic vector in . This can occur when the acting group is as big as the group of all measure-preserving transformations. But it does not occur, even though there is no cardinality obstruction to it, for the regular action of a group on itself. The connection of cyclic vectors to the uniqueness of invariant means is also discussed.
Unimodularity and Atomic Plancerel Measure.
Unitary dilations of multi-parameter semigroups of operators
Unitary representations of solvable Lie groups