Re: Simplify problems for checking easy equalities...

*To*: mathgroup at smc.vnet.net*Subject*: [mg53874] Re: Simplify problems for checking easy equalities...*From*: "Dr. Wolfgang Hintze" <weh at snafu.de>*Date*: Tue, 1 Feb 2005 04:08:25 -0500 (EST)*References*: <cti5nd$8n2$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Try to impose reasonable conditions on x and n: In[22]:= Simplify[Log[x^n] == n*Log[x], {x > 0, n \[Element] Reals}] Out[22]= True or In[23]:= Simplify[Log[x^n] == n*Log[x], {x > 0, Im[n] == 0}] Out[23]= True but it's not enough to just say x>0: In[24]:= Simplify[Log[x^n] == n*Log[x], x > 0] Out[24]= Log[x^n] == n*Log[x] Hopre this hepls Wolfgang 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 > >