Numerator

Usage

• Numerator[expr] gives the numerator of expr.

Notes

• Numerator picks out terms which do not have superficially negative exponents. Denominator picks out the remaining terms.

• An exponent is "superficially negative" if it has a negative number as a factor.

• The standard representation of rational expressions as products of powers means that you cannot simply use Part to extract numerators.

• Numerator can be used on rational numbers.

• See also: ExpandNumerator.

• New in Version 1.