proposition: Lemma msuppB_le g1 g2 : msupp (g1 - g2) `<=` msupp g1 `|` msupp g2.
proof: Proof. by rewrite -[msupp g2]msuppN; apply/msuppD_le. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap