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Commit 2021-12-18 14:23 04e2f5f7

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feat(algebra/group/basic): add a few lemmas (#10856)

  • move inv_eq_one, one_eq_inv, and inv_ne_one up;
  • move div_one' below div_eq_one to golf the proof;
  • add div_eq_inv_iff;
  • golf 2 proofs.

Estimated changes

added theorem div_eq_inv_self
modified theorem inv_eq_one
modified theorem inv_ne_one
modified theorem one_eq_inv