Denominator
 Usage
• Denominator[expr] gives the denominator of expr.
Notes
• 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. • New in Version 1.
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