nm, dn

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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