Commit 2020-06-29 13:48 4907d5d6

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feat(algebra/ring): ite_mul_one and ite_mul_zero_... (#3217) Three simple lemmas about if statements involving multiplication, useful while rewriting.

Estimated changes

Modified src/algebra/group/basic.lean

added theorem ite_mul_one

Modified src/algebra/ring.lean

added theorem ite_mul_zero_left

added theorem ite_mul_zero_right