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Expanding complex expression

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40647] Expanding complex expression
  • From: spasmous at yahoo.com (spasmous)
  • Date: Sat, 12 Apr 2003 03:08:44 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

I don't know Mathematica at all, but I've heard it can expand
complicated formulas and simplify them. I was wondering if someone
could help me with a quick query.

In particular I want to expand the following expression:

a = (SUM(b[j] * c[j]))^2  /  SUM(d[j]^2)

where b[j] = e + f[j] and d[j] = e + g[j], and e >> g[j].

Note all the variables are complex, as in (x + i.y), and I want to
expand the denominator to 2 or 3 terms. I've got pretty far doing it
by hand... but well, after 10 pages of working it stops being fun.

Thanks,
Spas.


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