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MathGroup Archive 2006

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Re: Help with Identities

  • To: mathgroup at smc.vnet.net
  • Subject: [mg65613] Re: Help with Identities
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Tue, 11 Apr 2006 04:04:21 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <e1ahdv$2j1$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

because SameQ[]  === will test for identical 
elements
You mean Equal[] and try
Log[x/y] == Log[x] - Log[y] /. {{x -> 2, y -> 3}, 
{x -> 2, y -> 3 I}, {x -> -2 I, y -> 3 I}} // 
FullSimplify



Regards

  Jens



"Sven C. Koehler" <schween at snafu.de> schrieb im 
Newsbeitrag news:e1ahdv$2j1$1 at smc.vnet.net...
| Hello!
|
| As an occasional mathematican, I sometimes 
forget that i.e.
|
| Log[x/y] is very similar to Log[x] / Log[y]
|
| Is there some way in Mathematica to see how an 
mathematical
| expression could look like alternatively? 
(Something like the  opposite
| of Simplify.)
|
| And then I wonder why
|
| Log[x/y] === Log[x] - Log[y]
|
| is False.  Can I instruct Mathematica to explain 
why this is False?
|
| Best wishes,
|
| Sven
| 



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