/common_factor.hpp/1.6/Fri Jul 30 04:46:54 2004//
/common_factor_ct.hpp/1.4/Mon Feb  7 14:34:32 2005//
/common_factor_rt.hpp/1.3/Fri Nov 10 23:15:48 2006//
/complex.hpp/1.1/Sat Oct 15 11:59:10 2005//
/octonion.hpp/1.15/Thu Jan 26 21:14:26 2006//
/quaternion.hpp/1.15/Wed May  4 13:40:34 2005//
D
