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Re: combining Log[] terms

• To: mathgroup at smc.vnet.net
• Subject: [mg30494] Re: [mg30482] combining Log[] terms
• From: BobHanlon at aol.com
• Date: Fri, 24 Aug 2001 04:05:53 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

In a message dated 2001/8/23 2:24:57 AM, nbock at acsu.buffalo.edu writes:

>Is there a function that combines terms like
>
>Log[a] - Log[b]
>
>to
>
>Log[a/b]?
>
>I couldn't find anything so far in the documentation regarding the
>Log[] function, only some references to Collect[], which does
>something similar to what I want for powers of a given expression.
>

Use a rule

Log[a] - Log[b];

% /. Log[y_] - Log[z_] -> Log[y/z]

Log[a/b]

%//PowerExpand

Log[a] - Log[b]


Bob Hanlon
Chantilly, VA  USA