Invariant measures and the set of exceptions to Littlewood's conjecture
Manfred Einsiedler, Anatole Katok, Elon Lindenstrauss
Abstract
We classify the measures on SL (k,R)/SL (k,Z) which are invariant and ergodic under the action of the group A of positive diagonal matrices with positive entropy. We apply this to prove that the set of exceptions to Littlewood's conjecture has Hausdorff dimension zero.
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