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FilledSmallSquare Denominator[expr] gives the denominator of expr.

FilledSmallSquare Denominator picks out terms which have superficially negative exponents. Numerator picks out all 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 denominators.

FilledSmallSquare Denominator can be used on rational numbers.

FilledSmallSquare See Section 1.4.7.

FilledSmallSquare See also: ExpandDenominator, Rationals.

FilledSmallSquare New in Version 1.

Further Examples