How to get the real and imaginary parts of a power series?
- To: mathgroup at smc.vnet.net
- Subject: [mg79998] How to get the real and imaginary parts of a power series?
- From: Gordon Smith <gsmithsf at hotmail.com>
- Date: Fri, 10 Aug 2007 01:52:48 -0400 (EDT)
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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- Re: How to get the real and imaginary parts of a power
- From: Murray Eisenberg <murray@math.umass.edu>
- RE: How to get the real and imaginary parts of a power series?
- From: "Jaccard Florian" <Florian.Jaccard@he-arc.ch>
- Re: How to get the real and imaginary parts of a power