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MathGroup Archive 2000

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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg24257] Re: Why doesn't Log[ E^x ] = x ?
  • From: "Bill Bertram" <wkb at ansto.gov.au>
  • Date: Wed, 5 Jul 2000 23:10:38 -0400 (EDT)
  • Organization: Australian Nuclear Science and Technology Organisation
  • References: <8jrdc2$e2t@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Christopher R. Carlen <crcarle at sandia.gov> wrote in message
news:8jrdc2$e2t at smc.vnet.net...
> Hi:
>
> E^Log[x] evaluates to x
>
> but
>
> Log[ E^x ] evaluates to Log[ E^x ]
>
> Why?
>


Same for Mathematica Version 4, except if you use "PowerExpand".

     PowerExpand[Log[Exp[x]]]  -> x

Cheers,
      Bill




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