Hi,
in this example I define a "small" group K of order 100 but if I ask
order(K) or Size(K) I obtain an error message...
Nicola.

e:=CyclotomicField( 20 );;
idm:=IdentityMat(4,e);;
i:=E(4);;
co:=(E(10)+(E(10))^(-1))/2;;
si:=(E(10)-E(10)^(-1))/(2*i);;
A:=[[0,0,co,-si],
[-si,co,0,0],
[co,si,0,0],
[0,0,si,co]];;
S:=[[1,0,0,0],
[0,1,0,0],
[0,0,-1,0],
[0,0,0,-1]];;
G:=Group(A,S);;
D:=DerivedSubgroup(G);
K:=Group(GeneratorsOfGroup(D),S);
Size(K);
exceeded the permitted memory (`-o' command line option) at
rep := rep * elm;
ClosureGroupDefault( H, gen ) called from
Enumerator( C ) called from
<function>( <arguments> ) called from read-eval-loop
Entering break read-eval-print loop, you can 'quit;' to quit to outer
loop,
or you can return to continue
brk>

Miles-Receive-Header: reply