mathlib

6c8b2cd6 - fix(algebra/field) remove `one_div_eq_inv` (#3749)

fix(algebra/field) remove `one_div_eq_inv` (#3749) It already existed as `one_div` for `group_with_zero` Also make `one_div` a `simp` lemma and renamed `nnreal.one_div_eq_inv` to `nnreal.one_div`.