Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-05-18 02:13 9f6f605b

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feat(data/polynomial/mirror): Central coefficient of p * p.mirror (#14096) This PR adds a lemma (p * p.mirror).coeff (p.nat_degree + p.nat_trailing_degree) = p.sum (λ n, (^ 2)). I also rearranged the file by assumptions on the ring R.

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