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MathGroup Archive 2003

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RE: Simplifying Exponents

  • To: mathgroup at
  • Subject: [mg43916] RE: [mg43899] Simplifying Exponents
  • From: "David Park" <djmp at>
  • Date: Sat, 11 Oct 2003 01:33:35 -0400 (EDT)
  • Sender: owner-wri-mathgroup at


In my Version 5 (and Version 4 also) it simplifies.

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

David Park
djmp at 

From: wes [mailto:wesh at]
To: mathgroup at

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.


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