Let TT (T, S) denote the set of equivalence classes inty. It is clear that if (T, S)~(T\S') then there is a natural one-to-one correspondence between TT (T, S) and v (T', S'). So\TT {T, S)\is …
M Ratner - Ergodic Theory & Dynamical Systems, 1982 - search.ebscohost.com
We classify up to an isomorphism all factors of the classical horocycle flow on the unit tangent bundle of a surface of constant negative curvature with finite volume.[ABSTRACT …