# Wolfram Language & System 11.0 (2016)|Legacy Documentation

This is documentation for an earlier version of the Wolfram Language.
BUILT-IN WOLFRAM LANGUAGE SYMBOL

# Series

Series[f,{x,x0,n}]
generates a power series expansion for f about the point x=x0 to order (x-x0)n.

Series[f,{x,x0,nx},{y,y0,ny},]
successively finds series expansions with respect to x, then y, etc.

## Details and OptionsDetails and Options

• Series can construct standard Taylor series, as well as certain expansions involving negative powers, fractional powers, and logarithms.
• Series detects certain essential singularities. On[Series::esss] makes Series generate a message in this case.
• Series can expand about the point x=.
• Series[f,{x,0,n}] constructs Taylor series for any function f according to the formula .
• Series effectively evaluates partial derivatives using D. It assumes that different variables are independent.
• The result of Series is usually a SeriesData object, which you can manipulate with other functions.
• Normal[series] truncates a power series and converts it to a normal expression.
• SeriesCoefficient[series,n] finds the coefficient of the n-order term.

## ExamplesExamplesopen allclose all

### Basic Examples  (3)Basic Examples  (3)

Power series for the exponential function around :

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Convert to a normal expression:

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Power series of an arbitrary function around :

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In any operation on series, only appropriate terms are kept:

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