proposition: Lemma cfDprodl_iso : isometry cfDprodl.
proof: Proof. by move=> phi1 phi2; rewrite -!cfDprod_cfun1r cfdot_dprod cfnorm1 mulr1. 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)