Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2019-07-22 01:35 f24dc98b

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feat(logic/unique): forall_iff and exists_iff (#1249) Maybe these should be @[simp]. My use case in fin 1 and it's slightly annoying to have default (fin 1) everwhere instead of 0, but maybe that should also be a @[simp] lemma.

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