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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: [mg24249] Re: Why doesn't Log[ E^x ] = x ?
  • From: zhl67 at my-deja.com
  • Date: Tue, 4 Jul 2000 15:22:11 -0400 (EDT)
  • 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?
>
> Thanks.
>
> P.S.  Mathematica 3.0
>
> _______________________
> Christopher R. Carlen
> Sr. Laser/Optical Tech.
> Sandia National Labs
>
>

Hi,

Your problem might be better answered by asking another: Why not
Log[Exp[x]] not equal to x=2 I Pi n (n integer)?

Hope that'll be one of the reason (if not all).

L Zhao


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