Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-02-09 05:58 8fd86366

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feat(field_theory/minpoly): add minpoly.nat_degree_pos (#6100) I needed this lemma and noticed that minpoly.lean actually uses this result more than minpoly.degree_pos (including in the proof of degree_pos itself). So I took the opportunity to golf a couple of proofs.

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