Dear GAP Forum,

I am working with GAP 3.4.4 version for mac PPC. The groups that I am

investigating are transitives, imprimitives and are contained in S_12.

However now the size of some of this groups gives to me problems. For

example:

gap> g:=Group((1,2)(3,4),(1,3,5)(2,4,6),(3,5,7,9,11)(4,6,8,10,12));
Group( (1,2)(3,4), (1,3,5)(2,4,6), ( 3, 5, 7, 9,11)( 4, 6, 8,10,12) )
gap> Size(g);
11520
gap> lat:=Lattice(g);
Error, sorry, can' t identify the group's solvable residuum in
struct.operations.RepresentativesPerfectSubgroups( struct ) called from
RepresentativesPerfectSubgroups( ShallowCopyNoSC( G ) ) called from
struct.operations.LatticeSubgroups( struct ) called from
LatticeSubgroups( G ) called from
struct.operations.Lattice( struct ) called from
...
brk>

Must say that I have more examples of this.

?can anybody tellme how to solve this problem.

If I have the generators of the group ? how to request to GAP subgroups

of certain size. This is to avoid the use of the Lattice() command because

I think that this instruction can be the problem.

I can use enough virtual memory: mac G3, 233Mhz, 3.6G are free in the hard

disk.

Thanks in advanced for your assistence

Mario Pineda Ruelas

e-mail: mpr@xanum.uam.mx