|  |  7.5.4.0. isRational Procedure from librarydmod.lib(see  dmod_lib).
 
Example: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
 |  | 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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