proposition: Lemma r_of_0q q : [r_of 0%:pr, q] = 0%:pr.
proof: Proof. by apply/val_inj; rewrite /= r_of_pqE mul0r. Qed.
imports: mathcomp(all_ssreflect ssralg ssrnum) mathcomp(reals normedtype) mathcomp(mathcomp_extra boolp) mathcomp(lra ring Rstruct)