
 Galois Field Package  from Mathematica Information Center 
  The Galois Field package is an implementation of finite fields in Mathematica. 
  The package uses the same operations as Mathematica itself (i.e., +,,*,/,^): this requires one to identify constants and variables to be in a finite field. 
  In this method many original functions of the system become available to finite fields without any modifications, i.e.; solving linear equations, inverses, determinants, derivations, resultants, etc. 
 library.wolfram.com /infocenter/MathSource/510 (107 words) 
