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FilledSmallSquareNumerator[expr] gives the numerator of expr.

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

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

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

FilledSmallSquareNumerator can be used on rational numbers.

FilledSmallSquare See The Mathematica Book: Section 1.4.7.

FilledSmallSquare See also: ExpandNumerator.

Further Examples