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

• To: mathgroup at smc.vnet.net
• Subject: [mg22061] Re: How do I force Log[Exp[x]]=x
• From: "Dimiter Petsev" <dimiter at cmmr.uah.edu>
• Date: Fri, 11 Feb 2000 02:38:47 -0500 (EST)
• Organization: The University of Alabama in Huntsville
• References: <87tp95$5ia@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Try:

PowerExpand[Log[Exp[x]]]

Works for me.

Regards,

Dimiter Petsev

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.
> --
> Bart Killam                            Work:  919-677-8000 x7538
> SAS Institute Inc.                     Fax:   919-677-8123
> SAS Campus Dr., R5115                  Email: sasrbk at unx.sas.com
> Cary NC 27513-8000
>