Proof of `Rokhlin's lemma`
What this proof establishes
Assuming the claims on the left, the claim on the right holds — checked by the archive's pipeline. Proof code is not displayed here.
Description
Following Rudolph (1990, Theorem 3.10): a backward Vitali covering by long orbit windows, off the null set of periodic points, is cut into blocks of height ; the bottoms of the blocks form the base of the tower.