Rigidity of group actions on homogeneous spaces, III
Abstract
Consider homogeneous G/H and G/F, for an S-algebraic group G. A lattice acts on the left strictly conservatively. The following rigidity results are obtained: morphisms, factors and joinings defined apriori only in the measurable category are in fact algebraically constrained. Arguing in an elementary fashion we manage to classify all the measurable commuting with the -action: assuming ergodicity, we find they are algebraically defined.
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