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Picking Out Pieces of Algebraic Expressions
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Numerator
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Denominator
Denominator
[
expr
]
gives the denominator of
expr
.
MORE INFORMATION
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
CLOSE ALL
Basic Examples
(1)
Extract denominator of a rational number:
In[1]:=
Out[1]=
Extract denominator of a rational expression:
In[2]:=
Out[2]=
Scope
(6)
Options
(2)
Properties & Relations
(5)
Neat Examples
(2)
SEE ALSO
Numerator
ExpandDenominator
Rationals
Rational
TUTORIALS
Picking Out Pieces of Algebraic Expressions
MORE ABOUT
Formula Manipulation
Rational Functions
New in 1
© 2008 Wolfram Research, Inc.
EXAMPLES
Basic Examples 
Scope 