proposition: Lemma r_of_1q q : [r_of 1%:pr, q] = 1%:pr.
proof: Proof. by apply/val_inj; rewrite /= r_of_pqE s_of_1q/= invr1 mulr1. Qed.
imports: mathcomp(all_ssreflect ssralg ssrnum) mathcomp(reals normedtype) mathcomp(mathcomp_extra boolp) mathcomp(lra ring Rstruct)