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Re: log expression not simplified

  • To: mathgroup at smc.vnet.net
  • Subject: [mg115661] Re: log expression not simplified
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
  • Date: Tue, 18 Jan 2011 05:46:16 -0500 (EST)
  • References: <ih16cv$jke$1@smc.vnet.net>

I don't know why Simplify can't do it, but PowerExpand first and then
Simplify does the job.

Cheers -- Sjoerd

On Jan 17, 11:41 am, Praeceptor <gianluca.cruci... at poste.it> wrote:
> Sorry, can anybody help me understand why
>
> Simplify[Log[a/b]/Log[b/a], Assumptions -> {a > 0, b > a}]
>
> doesn't reduce to -1 ??
> Thanks (it's for a simple Carnot cycle calculation...)!

I don't know why Simplify can't do it, but PowerExpand first and then
Simplify does the job.

Cheers -- Sjoerd


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