[GAP Forum] automorphisms of the group of unitriangular matrices over finite fields

[Ayan Mahalanobis]

Hi,

I have this problem. I like to work with the group of unitriangular 
matrices over a finite field using the polycyclic package. I know of 
some functions as the action on the minimal set of generators, i.e., 
their action on the elements on the second diagonal. I want to test if 
they are morphisms. How do I incorporate this mapping to the whole of 
the group? In other words how do I define this mapping on the example in 
GAP UnitraingualrPcpGroup(n,c)?

Thanks and Regards,
Ayan.