proposition: Lemma p_of_1s s : [p_of 1%:pr, s] = s.
proof: Proof. by apply: val_inj; rewrite /= p_of_rsE mul1r. Qed.
imports: mathcomp(all_ssreflect ssralg ssrnum) mathcomp(reals normedtype) mathcomp(mathcomp_extra boolp) mathcomp(lra ring Rstruct)