Denominator

Denominator[expr]

gives the denominator of expr.

Details and Options

  • Denominator picks out terms which have superficially negative exponents. Numerator picks out all 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 denominators.
  • Denominator can be used on rational numbers.

Examples

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Basic Examples  (1)

Extract denominator of a rational number:

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Extract denominator of a rational expression:

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Scope  (7)

Options  (2)

Properties & Relations  (5)

Neat Examples  (2)

Introduced in 1988
(1.0)