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RE: Simplifying Exponents

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

Wes,

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

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

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/ 




From: wes [mailto:wesh at acm.org]
To: mathgroup at smc.vnet.net

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