proposition: Lemma add0R x : 0 + x == x.
proof: Proof. exact: (Real.add_zero_left R). Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div order) mathcomp(ssralg ssrnum ssrint rat intdiv) Coq(Morphisms Setoid) fourcolor(real realsyntax)