Re: Simplify problems for checking easy equalities...

*To*: mathgroup at smc.vnet.net*Subject*: [mg53872] Re: [mg53856] Simplify problems for checking easy equalities...*From*: Andrzej Kozlowski <akoz at mimuw.edu.pl>*Date*: Tue, 1 Feb 2005 04:08:22 -0500 (EST)*References*: <200501300818.DAA08843@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

As I am sure many other will point out, the equality you want Mathematica to prove only holds for certain values of x and n so it would be wrong for it to give any other answer to the input you have given it. However: FullSimplify[Log[x^n] - n*Log[x],x>0&&Element[n,Reals]] 0 On 30 Jan 2005, at 08:18, Cyrus Erik Eierud wrote: > 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 > >