Re: extracting fractional powers of series expansion?

*To*: mathgroup at smc.vnet.net*Subject*: [mg78303] Re: extracting fractional powers of series expansion?*From*: dimitris <dimmechan at yahoo.com>*Date*: Thu, 28 Jun 2007 04:17:59 -0400 (EDT)*References*: <f5qji2$5ut$1@smc.vnet.net>

Hello. In[27]:= o = InputForm[1/Sqrt[x^2 + x] + O[x, Infinity]^10] Out[27]//InputForm= SeriesData[x, Infinity, {1, -2^(-1), 3/8, -5/16, 35/128, -63/256, 231/1024, -429/2048, 6435/32768}, 1, 10, 1] In[25]:= ({#1, SeriesCoefficient[o, #1]} & ) /@ Range[1, 9, 2] Out[25]= {{1, 1}, {3, 3/8}, {5, 35/128}, {7, 231/1024}, {9, 6435/32768}} Dimitris Tanim Islam : > 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