proposition: Lemma p_of_r1 r : [p_of r, 1%:pr] = r.
proof: Proof. by apply: val_inj; rewrite /= p_of_rsE mulr1. Qed.
imports: mathcomp(all_ssreflect ssralg ssrnum) mathcomp(reals normedtype) mathcomp(mathcomp_extra boolp) mathcomp(lra ring Rstruct)