fact: Definition mdeg {I : choiceType} (m : cmonom I) := (\sum_(k <- finsupp m) m k)%N.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap