proposition: Lemma Rnng_ge0 (x : Rnng) : 0 <= x.
proof: Proof. by case: x => p /= /RleP. Qed.
imports: mathcomp(all_ssreflect) mathcomp(all_algebra vector reals normedtype) mathcomp(mathcomp_extra boolp) mathcomp(Rstruct) ssrR realType_ext Reals Lra mathcomp(lra)