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3.10.2. Numerators and Denominators for Rational Functions
If F is a variable holding a rational function, then F.Num and F.Den
are the numerator and denominator, respectively.  The functions 'Num'
and 'Den', respectively, return the same.

Example

F := x/(x+y);
F.Num;
x
-------------------------------
F.Den;
x+y
-------------------------------
Den(F);
x + y
-------------------------------
See also: