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Re: Simplifying Exponents

  • To: mathgroup at
  • Subject: [mg43914] Re: [mg43899] Simplifying Exponents
  • From: "Peter Pein" <nospam at>
  • Date: Sat, 11 Oct 2003 01:33:33 -0400 (EDT)
  • References: <>
  • Sender: owner-wri-mathgroup at

Hi Wes,
I can not reproduce the described behaviour:
a*Exp[I*t*(-4 + x) - I*t*x]//Simplify
4.0 for Microsoft Windows (July 16, 1999)
\!\(a\ \[ExponentialE]\^\(\(-4\)\ \[ImaginaryI]\ t\)\)

Maybe some of the symbols you're using look same but aren't. What does
FullForm[expression] display? Or did you use Hold[] somwhere in your code?

Peter Pein, Berlin
petsie at
replace && by || to write to me

----- Original Message -----
From: "wes" <wesh at>
To: mathgroup at
Subject: [mg43914] [mg43899] Simplifying Exponents

> 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

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