feat(number_theory/quadratic_reciprocity): generalise legendre_sym to allow integer first argument (#11573)
feat(number_theory/quadratic_reciprocity): generalise legendre_sym to allow integer first argument (#11573)

Talking about the legendre symbol of -1 mod p is quite natural, so we generalize to include this case.
So far in a minimal way without changing any existing lemmas





leanprover-community/mathlib,leanprover-community/mathlib