>F=a+kV >and that constitutes a linear function by all math definitions. Not if k=k(V) as anticipated in Don's post Vladimir. -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.9.15 - Release Date: 16.4.2005 _______________________________________________ ATM mailing list http://www.atmlist.net/