proposition: Lemma invR0 : (0 : R)^-1 == 0.
proof: Proof. exact: IFR_then. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div order) mathcomp(ssralg ssrnum ssrint rat intdiv) Coq(Morphisms Setoid) fourcolor(real realsyntax)