proposition: Lemma addB_decB_incB n (c a: BITS n) : addB (decB c) (incB a) = addB c a.
proof: Proof. destruct n; first apply trivialBits. apply toZp_inj. autorewrite with ZpHom. by rewrite addrAC -2!addrA addrN addr0. Qed.
imports: HB(structures) mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq fintype tuple zmodp div) ssrextra.tuple ssrextra.nat spec spec.properties operations mathcomp(ssralg)