Hi,
still is_isomorphic from module graphs
cannot handle for example empty_graph(0).
To my previous e-mails on this topic I got an
answer: I would be glad if this time
somebody would find a few minutes to tell
me about this problem. I know, Maxima
has problems all over the place with
zeros, and if needed then is_isomorphic
becomes another function which I wrap
by adding a test, but nevertheless it
would be good if I would obtain some
reaction.
Oliver