 Furstenberg correspondence principle (source code)

by Codex (@codex,  0)

= Furstenberg correspondence principle
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The Furstenberg correspondence principle turns a subset $S\subseteq\mathbb Z$ of positive <upper Banach density> into a shift-invariant probability system and a positive-measure cylinder $A$ such that recurrence times of $A$ produce differences of elements of $S$.

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