Hi,
an error was introduced with 5.15 (while 5.14
worked correctly):
load(graphs);
max_clique(complete_graph(1));
max_degree: no max degree in an empty graph.
Obviously, the graph with one vertex has
a nice maximal clique (namely that vertex).
It seems to me that in general the graph-package
is somewhat sloppily written w.r.t. cases of "emptiness".
Oliver