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4.2.3 Numerators and Denominators for Rational Numbers
If F is a variable holding a fraction, then F.Num and F.Den are the numerator and denominator, respectively. The functions Num and Den, respectively, return the same.

Example 
  F := 3/5;
  F.Num;
3
-------------------------------
  F.Den;
5
-------------------------------
  Den(F);
5
-------------------------------
  1.75;
7/4
-------------------------------
  It.Num;
7
-------------------------------