For unipotent flows on homogeneous spaces G/Γ, every invariant ergodic probability measure is algebraic (supported on a closed orbit of a closed subgroup). Major 1990s breakthrough with deep number-theoretic consequences.
For unipotent flows on homogeneous spaces G/Γ, every invariant ergodic probability measure is algebraic (supported on a closed orbit of a closed subgroup). Major 1990s breakthrough with deep number-theoretic consequences.