       Re: Comparison of coefficients

• To: mathgroup at smc.vnet.net
• Subject: [mg91830] Re: [mg91805] Comparison of coefficients
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Tue, 9 Sep 2008 06:58:16 -0400 (EDT)

```eqn = a Exp[I k x] + b Exp[I k x] == 0;

eqn // Simplify

(a + b)*E^(I*k*x) == 0

eqn // Factor

(a + b)*E^(I*k*x) == 0

eqn // Together

(a + b)*E^(I*k*x) == 0

eqn // Collect[#, Exp[I k x]] &

(a + b)*E^(I*k*x) == 0

Bob Hanlon

---- Kay-Michael Voit <kay at voits.net> wrote:

=============
Hello,
I'm trying to solve a PDE using a Exp ansatz.
Now I am am stuck with the equation of the form
a Exp[I k x] + b Exp[I k x] == 0 (though much more complicated)
What I would like to do is a comparison of coefficients. How can I make
Mathemetica to show me a form of the equation where I can easily read
the comparison equations?
(In the above equation
(a + b) Exp[I k x] == 0
for example.)

Regards
Kay-Michael Voit

--

Bob Hanlon

```

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