[GAP Forum] Modules over a Group Ring.

[German Combariza]

Dear Forum,

I really appreciate if anybody can help me with this:

Is there a function like NullSpace but for modules over a group ring?

Let $G$ a finite $2$-group. Consider the Group Ring $F[G]$ over the field of
two elements. Let $V$ sub $F[G]$-module of $\oplus^n F[G]$ (n copies of the
group ring).

I have a $F[G]$-tranformation T:V^a \to V^b.

I need Kernel(T).