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