proposition: Lemma primeChar_scaleDl x : {morph primeChar_scale^~ x: a b / a + b}.
proof: Proof. by move=> a b; rewrite /primeChar_scale natrFp natrD mulrDl. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype div tuple bigop prime finset fingroup) mathcomp(ssralg poly polydiv morphism action countalg) mathcomp(finalg zmodp cyclic center pgroup abelian matrix) mathcomp(mxpoly vector falgebra fieldext separable galois)