fact: Definition antisym : qualifier 0 {mpoly R[n]} := [qualify p | [forall s, msym s p == (-1) ^+ s *: p]].
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(ssralg ssrint fingroup perm zmodp binomial) mathcomp(ssrcomplements freeg mpoly) tools permcomp presentSn sorted partition