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Re: log expression not simplified

  • To: mathgroup at smc.vnet.net
  • Subject: [mg115666] Re: log expression not simplified
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Tue, 18 Jan 2011 05:47:13 -0500 (EST)

I don't know why it doesn't work; however, you can force it with PowerExpand

Log[a/b]/Log[b/a] // PowerExpand // Simplify

-1


Bob Hanlon

---- Praeceptor <gianluca.cruciani 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...)!




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