Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-08-29 08:18 301a6253

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feat(ring_theory/polynomial/basic): generalize is_domain to no_zero_divisors (#16226) This generalization makes this work on comm_semiring instead of comm_ring. This also removes a duplicate proof of nontriviality. mv_polynomial.eq_zero_or_eq_zero_of_mul_eq_zero has been removed in favor of this instance.

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