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Re: Why doesn't Log[ E^x ] = x ?

  • To: mathgroup at
  • Subject: [mg24458] Re: Why doesn't Log[ E^x ] = x ?
  • From: Paul Abbott <paul at>
  • Date: Tue, 18 Jul 2000 00:59:02 -0400 (EDT)
  • Organization: University of Western Australia
  • References: <8jrdc2$>
  • Sender: owner-wri-mathgroup at

In article <8jrdc2$e2t at>, "Christopher R. Carlen" 
<crcarle at> wrote:

> Hi:
> E^Log[x] evaluates to x 
> but
> Log[ E^x ] evaluates to Log[ E^x ]
> Why?

For a full answer, you might want to have a look at the paper by Helmer 
Aslaksen called "Can your computer do complex analysis?" at

I have a Notebook which implements all the tests in Aslaksen's paper, if 
you are interested.


Paul Abbott                                   Phone: +61-8-9380-2734
Department of Physics                           Fax: +61-8-9380-1014
The University of Western Australia                
Nedlands WA  6907                      

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