Commit 2022-11-28 23:10 a00186d7

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refactor(data/polynomial/degree/definitions): Remove duplicate lemma (#17740) This PR golfs zero_le_degree_iff, and removes the redundant lemma degree_nonneg_iff_ne_zero.

Estimated changes

Modified src/data/polynomial/degree/definitions.lean

deleted theorem polynomial.degree_nonneg_iff_ne_zero

modified theorem polynomial.zero_le_degree_iff