Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-01-07 10:05 47c60812

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chore(group_theory/perm/sign): remove classical for sign congr simp lemmas (#5622) Previously, some lemmas about how perm.sign simplifies across various congrs of permutations assumed classical, which prevented them from being applied by the simplifier. This makes the decidable_eq assumptions explicit.

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