Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-10-05 19:45 d2140efb

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feat(algebra/gcd_monoid): gcd_mul_dvd_mul_gcd (#4386) Adds a gcd_monoid version of nat.gcd_mul_dvd_mul_gcd

Estimated changes

added theorem gcd_mul_dvd_mul_gcd