Thanks Stephen, I just found it.
gap> A:=AutomorphismGroupPGroup(g);; gap> IsGroup(A); false Applying it directly with AutomorphismGroup works. Thanks, Siddhartha On Sun, Feb 23, 2020 at 5:21 PM Stephen Linton <s...@st-andrews.ac.uk> wrote: > Ah I see. Your group B is made using PcGroupAutPcGroup. This essentially > forgets that the group is an automorphism group and simply computes an > isomorphic PC Group ( at least for the soluble part). If you want to work > with the automorphisms as such, you either need to work directly in the > AutomorphismGroup, or keep track of the explicit isomorphism between that > group and a PC group. > > > > Steve > > > > > > > > *From: *Siddhartha Sarkar <siddharth...@gmail.com> > *Date: *Sunday, 23 February 2020 at 11:39 > *To: *Stephen Linton <s...@st-andrews.ac.uk> > *Cc: *GAP Forum <forum@gap-system.org> > *Subject: *Re: Testing action of automorphisms on groups > > > > Dear Stephen, > > > > Thanks. It still shows an error. > > > > Siddhartha > > > > gap> p:=Image(a1,x1); > > Error, usage: Image(<map>), Image(<map>,<elm>), Image(<map>,<coll>) at > /Users/sidhu/Desktop/GAP/gap-4.10.2/lib/mapping.gi:198 called from > > <function "Image">( <arguments> ) > > called from read-eval loop at *stdin*:19 > > you can 'quit;' to quit to outer loop, or > > you can 'return;' to continue > > brk> return; > > Error, Function call: <func> must return a value > > not in any function at *stdin*:19 > _______________________________________________ Forum mailing list Forum@gap-system.org https://mail.gap-system.org/mailman/listinfo/forum
