Simplify[] problem
- To: mathgroup at yoda.ncsa.uiuc.edu
- Subject: Simplify[] problem
- From: Markus.Lautenbacher at physik.tu-muenchen.de
- Date: Tue, 19 Feb 91 09:45:56 +0100
Keith R. Slavin writes:
> When asked to Simplify[] this expression:
>
> (E^((k + -I*w)*x)*(k + m + -I*w))/
> (2*(-E^((k + -I*w)*(-1/2 + x))/2 + E^((k + -I*w)*(1/2 + x))/2))
>
> Mathematica does NOTHING with it (not even canceling out the 2's in the
> denominator)! The terms with x should cancel altogether, and indeed they do
> if I replace (k - I w) with a single variable, or remove the 'm' from the
> expression, or several other minor changes...
I did
In[1]:= expr = <Expression given above>
Out[1]= ...
In[2]:= Simplify[ ExpandAll[epxr] ]
(k + I w)/2 (k + I w)/2 (k + I w)/2
E k + E m + -I E w
Out[2]= ---------------------------------------------------
k I w
E - E
I don't know whether this is what K.R. Slavin wants, but at least
the "2" and "x" are gone.
MARKUS