proposition: Lemma wlength_Rhull (A : set R) : wlength [set` Rhull A] = wlength A.
proof: Proof. by rewrite /wlength Rhull_involutive. Qed.
imports: mathcomp(all_ssreflect ssralg ssrnum ssrint interval) mathcomp(finmap fingroup perm rat) HB(structures) mathcomp.classical(mathcomp_extra boolp classical_sets) mathcomp.classical(functions fsbigop cardinality) reals ereal signed topology numfun normedtype sequences esum real_interval measure realfun