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

*To*: mathgroup at smc.vnet.net*Subject*: [mg24458] Re: Why doesn't Log[ E^x ] = x ?*From*: Paul Abbott <paul at physics.uwa.edu.au>*Date*: Tue, 18 Jul 2000 00:59:02 -0400 (EDT)*Organization*: University of Western Australia*References*: <8jrdc2$e2t@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

In article <8jrdc2$e2t at smc.vnet.net>, "Christopher R. Carlen" <crcarle at sandia.gov> 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 http://www.math.nus.edu.sg/aslaksen/helmerpub.shtml I have a Notebook which implements all the tests in Aslaksen's paper, if you are interested. Cheers, Paul -- Paul Abbott Phone: +61-8-9380-2734 Department of Physics Fax: +61-8-9380-1014 The University of Western Australia Nedlands WA 6907 AUSTRALIA http://physics.uwa.edu.au/~paul