proposition: Fact cfMorph_is_multiplicative : multiplicative cfMorph.
proof: Proof. split=> [phi psi|]; [apply/cfunP=> x | exact: cfMorph_cfun1]. by rewrite !cfunElock mulrnAr mulrnAl -mulrnA mulnb andbb. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq path) mathcomp(div choice fintype tuple finfun bigop prime order) mathcomp(ssralg poly finset fingroup morphism perm) mathcomp(automorphism quotient finalg action gproduct) mathcomp(zmodp commutator cyclic center pgroup sylow) mathcomp(matrix vector falgebra ssrnum algC algnum) mathcomp(archimedean)