proposition: Lemma ratN_D (n m: nat) : (n+m)%N%:Q = (n)%:Q + (m)%:Q.
proof: Proof. by rewrite - rmorphD. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq choice fintype order bigop ssralg) mathcomp(div ssrnum ssrint rat prime path binomial) mathcomp(tuple finset) gaia(fibm)