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
