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MathGroup Archive 2006

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General--Simplify exponents in exponential terms

  • To: mathgroup at smc.vnet.net
  • Subject: [mg68792] General--Simplify exponents in exponential terms
  • From: guillaume_evin at yahoo.fr
  • Date: Fri, 18 Aug 2006 03:12:54 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi!

I have difficulties to simplify exponents in a big expression:

Cov = E^(-(beta + 2eta)h(1 + k) lambda (-96beta^2 E^ (2 eta h(1 + k))(-1+E^beta h)^2 eta^3 mu2 + 24 E^2 eta h (1+ k)((-1+ E^(beta h)^2 eta^5 mu2 (4 + theta)^2 + 48 beta E^beta h(1 + k) ....

I absolutely want to avoid exponentiels with positive exponents. For example, I could have eta>10, h=24 and k=1 when I apply this expression in the real world, which gives Cov=Nan. I don't know how to use ComplexityFunction in the function Simplify to tackle this problem. I simply want the term E^(-(beta + 2eta) to enter with the other exponential terms. Something like :

Simplify[Cov, ComplexityFunction-> don't factorize exponential terms]

would be perfect.

Thanks you in advance

Guillaume

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