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Picking Out Pieces of Algebraic Expressions
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Denominator
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Rational
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Numerator
Numerator
[
expr
]
gives the numerator of
expr
.
MORE INFORMATION
Numerator
picks out terms which do not have superficially negative exponents.
Denominator
picks out the 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 numerators.
Numerator
can be used on rational numbers.
EXAMPLES
CLOSE ALL
Basic Examples
(1)
Extract the numerator of a rational number:
In[1]:=
Out[1]=
Extract the numerator of a rational expression:
In[2]:=
Out[2]=
Scope
(6)
Options
(2)
Properties & Relations
(4)
SEE ALSO
Denominator
ExpandNumerator
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 