Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-05-10 16:44 92395fdf

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feat(data/list/rotate): is_rotated (#7299) is_rotated l₁ l₂ or l₁ ~r l₂ asserts that l₁ and l₂ are cyclic permutations of each other. This is defined by claiming that ∃ n, l.rotate n = l'.

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