Tsvetelina Petkova has asked for my help with a program to count nonisomorphic colorings of general graphs. I haven't made any promises. I can describe an algorithm for doing this, however, it would be a bear to program in Perl or C++, which are all I have at my disposal. I was wondering if someone versed in Mma or some other symbolic language might want to discuss the possibility of implementing my algorithm. -------------------------------- - David Wilson