Re: Simplify problems for checking easy equalities...

*To*: mathgroup at smc.vnet.net*Subject*: [mg53875] Re: [mg53856] Simplify problems for checking easy equalities...*From*: Bob Hanlon <hanlonr at cox.net>*Date*: Tue, 1 Feb 2005 04:08:26 -0500 (EST)*Reply-to*: hanlonr at cox.net*Sender*: owner-wri-mathgroup at wolfram.com

Log[(-1)^3]==3*Log[-1] False Simplify[Log[x^n]-n*Log[x],{Element[{n,x}, Reals],x>=0}] 0 PowerExpand[Log[x^n]-n*Log[x]] 0 Bob Hanlon > > From: cyruserik at tele2.se (Cyrus Erik Eierud) To: mathgroup at smc.vnet.net > Date: 2005/01/30 Sun AM 03:18:19 EST > To: mathgroup at smc.vnet.net > Subject: [mg53875] [mg53856] Simplify problems for checking easy equalities... > > Please Help! > > Thanks for all great answers I've already found here! > My problem is that I can not simplify what to me seems as a very > simple equality task. This is what I want Mathematica to return zero > for: > > in[1]:= FullSimplify[Log[x^n] - n*Log[x]] > > out[1]= -n Log[x] + Log[x^n]) > > I have used Simplify to check equalities, but the one above (and many > other equations similar to the one above) just don't simplify. Am I > doing anything wrong or does anyone know of a better way to check > equalities? > > Appreciate any help, > Cyrus Eierud, Student > cyruserik at tele2.se > >