Commit 2022-04-26 17:50 325dbc88

refactor(number_theory/legendre_symbol/quadratic_reciprocity.lean): change definition of legendre_sym, simplify proofs, add lemmas (#13667) This changes the definition of legendre_sym to use quadratic_char. The proof of some of the statements can then be simplified by using the corresponding statements for quadratic characters. Some new API lemmas are added, including the fact that the Legendre symbol is multiplicative, Also, a few simps are squeezed in .../quadratic_char.lean.