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Results tagged with ds.dynamical-systems
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user 98515
Dynamics of flows and maps (continuous and discrete time), including infinite-dimensional dynamics, Hamiltonian dynamics, ergodic theory.
4
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1
answer
326
views
Kac's lemma for amenable group actions
The classical Kac's lemma says the following.
Let $(X,\mu)$ be a probability space and $T$ a measure preserving transformation. Assume $A\subset X$ has positive measure. Then $$\sum_{k\ge 1} k\mu(A_k …
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