synopsis: INT numberofvariables(OP pol,res)
description:computes the number of variables of the POLYNOM object pol. The result is a positiv INTEGER object res. If the self-part of pol is NULL, the result is zero.
bug:if you have for example the POLYNOM x_0 x_3 the result will be four, because the routines looks on the index of the highest exponent not equal to zero.
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