proposition: Lemma eqr_sqrtC : {mono sqrtC : x y / x == y}.
proof: Proof. exact: eqr_rootC. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)