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MathGroup Archive 2007

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Re: extracting fractional powers of series expansion?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg78237] Re: extracting fractional powers of series expansion?
  • From: dh <dh at metrohm.ch>
  • Date: Wed, 27 Jun 2007 05:12:18 -0400 (EDT)
  • References: <f5qji2$5ut$1@smc.vnet.net>


Hi Tamin,

For an expansion around Infinity, SeriesCoefficient wants the exponent 

of 1/x, e.g.:

s=Series[1/Sqrt[x + 1]

SeriesCoefficient[s,{x,Infinity,5}],3/2] gives the coefficient of the 

second term.

hope this helps, Daniel





Tanim Islam wrote:

> Hi:

> 

> How do I extract a given fractional power term in a series expansion? For

> instance, I do a series expansion of a function about infinity. How do I

> extract the -1/2 power term with, say, SeriesCoefficient. I am using

> Mathematica 6.

> 

> Tanim Islam

> 




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