Hello nice GiNaC people, Could you please change the line for (its = ls.begin(), itr != lr.begin(); its != ls.end(); ++its, ++itr) that occurs in the file mul.cpp in the function mul::algebraic_subs_mul into for (its = ls.begin(), itr = lr.begin(); its != ls.end(); ++its, ++itr) (i.e., remove an exclamation mark). This should give less segmentation faults in my programs. Bye, Chris Dams