Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-10-14 07:51 264ff903

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refactor(analysis/special_functions): generalise nth-root lemmas (#9704) exists_pow_nat_eq and exists_eq_mul_self both hold for any algebraically closed field, so pull them out into is_alg_closed/basic and generalise appropriately Closes #4674

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