proposition: Lemma daddeC_subproof : commutative (S := \bar^d R) dual_adde.
proof: Proof. by case=> [x||] [y||] //; rewrite /dual_adde /= addrC. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap) mathcomp(mathcomp_extra) signed