Dear all, This program runs ok on my GAP F:=FreeGroup(1); G:=F/[F.1^5]; # Z_5 h:=NqEpimorphismNilpotentQuotient(G,1);; H:=Image(h); Size(H); # critical line IsomorphismPermGroup(H);
but if I remove the "critical line" F:=FreeGroup(1); G:=F/[F.1^5]; # Z_5 h:=NqEpimorphismNilpotentQuotient(G,1);; H:=Image(h); IsomorphismPermGroup(H); it runs into error as follows: gap> F:=FreeGroup(1); <free group on the generators [ f1 ]> gap> G:=F/[F.1^5]; # Z_5 <fp group on the generators [ f1 ]> gap> h:=NqEpimorphismNilpotentQuotient(G,1); [ f1 ] -> [ g1 ] gap> H:=Image(h); Pcp-group with orders [ 5 ] gap> IsomorphismPermGroup(H); Error, no method found! For debugging hints type ?Recovery from NoMethodFound Error, no 2nd choice method found for `IsomorphismPermGroup' on 1 arguments 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> I have no idea why choosing not to calculate Size(H) makes the program break. Can anyone help me out? -- Best Regards Prof. Vdovin Evgeny Institute of Mathematics pr-t Acad. Koptyug, 4 630090, Novosibirsk, Russia Office +7 383 3634540 Cellular +7 913 9475524 Fax +7 383 3332598 _______________________________________________ Forum mailing list Forum@mail.gap-system.org http://mail.gap-system.org/mailman/listinfo/forum
