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MathGroup Archive 2007

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Re: How to get the real and imaginary parts of a power series?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg80016] Re: How to get the real and imaginary parts of a power series?
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 10 Aug 2007 06:42:35 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <f9gvbc$b90$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

try

ComplexExpand[Re[s] // Normal]

Regards
   Jens

Gordon Smith wrote:
> Suppose s = Series[Cosh[(x + I y)u, {u,0,2}]. How can I get the real part 1 + 1/2(x^2 - y^2) u^2 + O(u^3) and the imaginary part x y u^2 + O(u^3) ? I thought ComplexExpand[Re[s]] should give me the real part of s, but it just gives me s unchanged. (Mathematica newbie here!)
> 


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