Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-09-12 16:34 c8771b6b

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fix(algebra/ring/basic): delete mul_self_sub_mul_self_eq (#4119) It's redundant with mul_self_sub_mul_self. Also renamed mul_self_sub_one_eq to mul_self_sub_one.

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