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 nm(rat)

:: Numerator of rat.
 dn(rat)

:: Denominator of rat.
 return

integer or polynomial
 rat

rational number or rational expression

Numerator and denominator of a given rational expression.

For a rational number, they return its numerator and denominator,
respectively. For a rational expression whose numerator and denominator
may contain rational numbers, they do not separate those rational
coefficients to numerators and denominators.

For a rational number, the denominator is always kept positive, and
the sign is contained in the numerator.

Risa/Asir does not cancel the common divisors unless otherwise explicitly
specified by the user.
Therefore,
nm() and dn() return the numerator and the
denominator as it is, respectively.
[2] [nm(43/8),dn(43/8)];
[43,8]
[3] dn((x*z)/(x*y));
y*x
[3] dn(red((x*z)/(x*y)));
y
 References

section
red .
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