proposition: Lemma minrN x : min x (- x) = - `|x|.
proof: Proof. exact: real_minrN. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)