proposition: Lemma mul1R x : 1 * x == x.
proof: Proof. exact: (Real.mul_one_left R). Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div order) mathcomp(ssralg ssrnum ssrint rat intdiv) Coq(Morphisms Setoid) fourcolor(real realsyntax)