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MathGroup Archive 2000

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Re: How do I force Log[Exp[x]]=x

  • To: mathgroup at smc.vnet.net
  • Subject: [mg22044] Re: How do I force Log[Exp[x]]=x
  • From: "Kevin J. McCann" <kevin.mccann at jhuapl.edu>
  • Date: Fri, 11 Feb 2000 02:38:23 -0500 (EST)
  • Organization: Johns Hopkins University Applied Physics Lab, Laurel, MD, USA
  • References: <87tp95$5ia@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

ComplexExpand[Log[E^x]]

does the trick.

Kevin

--

Kevin J. McCann
Johns Hopkins University APL


Bart Killam <sasrbk at unx.sas.com> wrote in message
news:87tp95$5ia at smc.vnet.net...
>
>   For real x, Log[Exp[x]]=x. For general complex x
> Mathematical leaves this expression unevaluated. I
> have tried Log[Exp[x/;Im[x]=0]], but this give a result
> of 0.
>
>   How do I tell Mathematica that I want the expression
> simplied for real x ? Thanks for any help.





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