[Maxima] problems with the graph without vertices

[Oliver Kullmann]

Hi,
 

(%i2) is_bipartite(empty_graph(0));
Evaluation took 0.0040 seconds (0.0001 elapsed) using 1.148 KB.
(%o294) false

though obviously the graph without vertices is bipartite (2-colourable).

By the way, we also have

(%i3) complete_graph(0);
Argument 1 to complete_graph is not a positive integer
 -- an error.  To debug this try debugmode(true);

where the K_n, the complete graph with n vertices, is also
well-defined for n = 0.

Oliver