Series Expansion
- To: mathgroup at smc.vnet.net
- Subject: [mg100457] Series Expansion
- From: Ossama Kullie <okullie at chimie.u-strasbg.fr>
- Date: Thu, 4 Jun 2009 06:32:42 -0400 (EDT)
- References: <h02vo6$8ek$1@smc.vnet.net> <h050kr$abg$1@smc.vnet.net>
Hi every body,
I have the following function fm which is a rational between to series :
fm1 = 1 + Sum[a_n*x^n, {n, 1, M}]
fm2 = 1 + Sum[b_n*x^n, {n, 1, M + 2}]
fm = (fm1/fm2) // Expand
Now I want to have aseries exansion of fm to some order:
Series[fm, {x, 0, 5}] // Expand
But I get the input nothing else? can somebody there give me some hit
please and thanks in advance.
1/(1 + \!\(
\*UnderoverscriptBox[\(\[Sum]\), \(n = 1\), \(2 + M\)]\(
\*SuperscriptBox[\(x\), \(n\)]\ b_n\)\)) + \!\(
\*UnderoverscriptBox[\(\[Sum]\), \(n = 1\), \(M\)]\(
\*SuperscriptBox[\(x\), \(n\)]\ a_n\)\)/(1 + \!\(
\*UnderoverscriptBox[\(\[Sum]\), \(n = 1\), \(2 + M\)]\(
\*SuperscriptBox[\(x\), \(n\)]\ b_n\)\))
Best Regards,
O. Kullie