       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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