Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-10-12 10:16 8fa91251

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feat(data/polynomial/degree/erase_lead): definition and basic lemmas (#4527) erase_lead serves as the reduction step in an induction, breaking off one monomial from a polynomial. It is used in a later PR to prove that reverse is a multiplicative monoid map on polynomials.

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