Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-11-27 14:25 876481ef

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feat(field_theory/separable): add separable_of_X_pow_sub_C and squarefree_of_X_pow_sub_C (#5052) I've added that X ^ n - a is separable, and so squarefree.

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