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Re: Re: Inverse of "PowerExpand"
Klaus, This brings up an interesting point about Mathematica that I think is often troubling to new users. That is that Mathematica does not have commands for everything, for example there is no command for complete the square. If Mathematica had commands for everything, since mathematics and computing applications are so broad and varied, it would end up having millions of commands - and then you would have trouble finding the one you need. Mathematica is not so much a tool box for doing mathematics, but a metatoolbox for making the tools you will need to perform calculations in your particular application. So it is almost always necessary to make definitions or rules and do programming while using Mathematica. Many people find it difficult to adjust to that point of view and may spend much effort trying to find an existing Mathematica command to do what they want, when they could much more quickly write the necessary tool. Of course, sometimes you may write a tool and later find that Mathematica has it - but that is a lesser problem. David Park djmp at earthlink.net http://home.earthlink.net/~djmp/ From: Klaus G [mailto:Karl_boehme_9 at msn.com] To: mathgroup at smc.vnet.net > Klaus,> One method... > Log[a] + 2*Log[b] - Log[c]; > % //. (a_.)*Log[b_] + (c_.)*Log[d_] -> Log[b^a*d^c] > > Log[(a*b^2)/c] OK. But you assume that you know how to add logarithms.. Klaus G.