FLink is used to evaluate expressions externally from Mathematica in the Fermat program.

One of the most powerful features of Fermat is the fast evaluation of the GCD - the greatest common divisor.

Thus one can speed-up the evaluations in Mathematica: instead of calling Together, one should transform the expression into a string, call the external FEval function and again convert the result into an expression.

**Currently one is required to list the variables at the
initialization. This restriction is to be removed in December when a variable
auto declare option is introduced into Fermat.**

The variables should be all low-case.

It is recomended to close the FLink from Mathematica, otherwise the Fermat process might get hanged and not killed automatically after you exit Mathematica.