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MathGroup Archive 2005

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Re: Simplify problems for checking easy equalities...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg53861] Re: [mg53856] Simplify problems for checking easy equalities...
  • From: "David Park" <djmp at earthlink.net>
  • Date: Tue, 1 Feb 2005 04:08:11 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Cyrus,

Include the proper assumptions in the Simplify statement.

Simplify[Log[x^n] - n*Log[x], n \[Element] Integers && x > 0]
0

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/ 

From: Cyrus Erik Eierud [mailto:cyruserik at tele2.se]
To: mathgroup at smc.vnet.net

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




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