[GAP Forum] Normal subgroups of unit group of group algebra FD_8, for the field F with 4 elements

[Surinder Kaur]

Dear all
Is there any way to get all the normal subgroups of the normalized unit
group V(FD_8), where FD_8 is the group ring of the dihedral group D_8 and F
is the field with 4 elements. I tried the following straight forward way
but it's not working.


g:=DihedralGroup(8);;
f:=GF(4);;
fg:=GroupRing(f,g);;
e:=Identity(fg);;
u:=Units(fg);;
h:=NormalSubgroups(u);;
Print(h, "\n");
-- 
*Regards*
*Surinder Kaur*
*Research scholar  *
*Department of Mathematics *
*IIT Ropar*