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MathGroup Archive 2003

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Re: Simplifying Exponents

  • To: mathgroup at smc.vnet.net
  • Subject: [mg43915] Re: [mg43899] Simplifying Exponents
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Sat, 11 Oct 2003 01:33:34 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

On Friday, October 10, 2003, at 04:06 PM, wes wrote:

> I am trying to generate rows of a determinant for a Hill's DE. To
> do this I generate a series of exponentials of the typical form
>
> 	a Exp[I t(-4 + x) - I t x]
>
> where the coefficient a and integer 4 vary from term to term. There
> also may be more terms in the exponent.
>
> Mathematica resolutely refuses to simplify the exponents, which in
> the above case would result in
>
> 	a Exp[-4 I t].
>
> There are several terms which have different extended exponents but
> the same simplified exponents.
>
> To generate the determinant I need to collect all of the terms having
> the same simplified exponent.
>
> Any advice gratefully received.
>
> Wes
>
>
>

Ehm... have you tried Simplify?



Simplify[a*Exp[I*t*(-4 + x) - I*t*x]]


a/E^(4*I*t)


Andrzej Kozlowski
Yokohama, Japan
http://www.mimuw.edu.pl/~akoz/
http://platon.c.u-tokyo.ac.jp/andrzej/


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