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MathGroup Archive 2001

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RE: combining Log[] terms

  • To: mathgroup at
  • Subject: [mg30502] RE: [mg30482] combining Log[] terms
  • From: "David Park" <djmp at>
  • Date: Fri, 24 Aug 2001 04:06:00 -0400 (EDT)
  • Sender: owner-wri-mathgroup at


One method would be to use a replacement rule.

2*Log[a] - 3*Log[b] /. 
  (k1_.)*Log[x_] + (k2_.)*Log[y_] -> Log[x^k1*y^k2]

David Park
djmp at 

> From: Nicolas Bock [mailto:nbock at]
To: mathgroup at
> 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.
>    Thanks already for you help,
>      nick

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