| ##### 7.5.4.0. isRational Procedure from library `dmod.lib` (see dmod_lib). Usage: isRational(n); n number Return: int Purpose: determine whether n is a rational number, that is it does not contain parameters. Assume: ground field is of characteristic 0 Example:
    LIB "dmod.lib";
    ring r = (0,a),(x,y),dp;
    number n1 = 11/73;
    isRational(n1);
    ==> 1
    number n2 = (11*a+3)/72;
    isRational(n2);
    ==> 0

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