Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2005
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2005

[Date Index] [Thread Index] [Author Index]

Search the Archive

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
> 
> 


  • Prev by Date: Matrix equations
  • Next by Date: Re: Simplify problems for checking easy equalities...
  • Previous by thread: Re: Simplify problems for checking easy equalities...
  • Next by thread: Re: Simplify problems for checking easy equalities...