proposition: Fact mulfxC : commutative subfext_mul.
proof: Proof. by elim/quotW=> x; elim/quotW=> y; rewrite !piE /subfx_mul_rep /= mulrC. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq div) mathcomp(choice fintype tuple finfun bigop ssralg countalg) mathcomp(finalg zmodp matrix vector falgebra poly polydiv) mathcomp(mxpoly generic_quotient)