Image d'un homomorphisme et flot des poids d'une relation d'Équivalence mesurée.
Induced and amenable ergodic actions of Lie groups
Infinite ergodic index -actions in infinite measure
We construct infinite measure preserving and nonsingular rank one -actions. The first example is ergodic infinite measure preserving but with nonergodic, infinite conservative index, basis transformations; in this case we exhibit sets of increasing finite and infinite measure which are properly exhaustive and weakly wandering. The next examples are staircase rank one infinite measure preserving -actions; for these we show that the individual basis transformations have conservative ergodic Cartesian...
Invariant Measures and Minimal Sets of Horospherical Flows.
Invariant Measures and Orbit Closures for Unipotent Action on Homogeneous Spaces (Survey).
Invariant measures for actions of unipotent groups over local fields on homogeneous spaces.