proposition: Lemma malgSpred g : g != 0 -> mmeasure g = (mmeasure g).-1.+1.
proof: Proof. by rewrite -mmeasure_eq0 -lt0n => /prednK. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap