Arguments hom_mxP {m f W}.

Lemma scalar_mx_hom a m (U : 'M_(m, n)) : (U <= dom_hom_mx a%:M)%MS.
Definition rfix_mx (H : {set gT}) :=
let commrH := \matrix_(i < #|H|) mxvec (rG (enum_val i) - 1%:M) in
kermx (lin1_mx (mxvec \o mulmx commrH \o lin_mul_row)).