fact: Definition evalXY : polZ -> polXY := mmap ((@mpolyC m _) \o (@mpolyC n R)) (fun i => 'X_((vecmx_index i).1) (X) * 'X_((vecmx_index i).2) (Y)).
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(ssrint rat ssralg ssrnum algC matrix vector) mathcomp(mpoly) tools partition ordtype antisym Schur_mpoly Schur_altdef sympoly homogsym permcent