Re: extracting fractional powers of series expansion?

*To*: mathgroup at smc.vnet.net*Subject*: [mg78292] Re: [mg78225] extracting fractional powers of series expansion?*From*: Andrzej Kozlowski <akoz at mimuw.edu.pl>*Date*: Wed, 27 Jun 2007 05:40:29 -0400 (EDT)*References*: <200706260832.EAA05639@smc.vnet.net>

On 26 Jun 2007, at 17:32, 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 > For example: f[x_] := ArcTanh[Sqrt[x]] s = SeriesCoefficient[Series[f[x], {x, Infinity, 3}], 5/2] 1/5 Note that this is the coefficient of (1/x)^(5/2) Andrzej Kozlowski

**References**:**extracting fractional powers of series expansion?***From:*Tanim Islam <tanim.islam@gmail.com>