Re: Working with Log
- To: mathgroup at smc.vnet.net
- Subject: [mg112141] Re: Working with Log
- From: Themis Matsoukas <tmatsoukas at me.com>
- Date: Thu, 2 Sep 2010 02:29:56 -0400 (EDT)
To summarize the responses, there are two solutions:
1: Tell mathematica that the arguments are positive numbers:
FullSimplify[2 Log[a] + 3 Log[b], Assumptions -> {a > 0, b > 0, c > 0}]
Log[a^2 b^3]
2: Use a replacement rule
2 Log[a] + 3 Log[b] //. a_ Log[b_] + c_ Log[d_] -> Log[b^a d^c]
Log[a^2 b^3]
Thanks to all.
Themis