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June 21st, 2010, 05:39 PM   #1
Joined: May 2010

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Logarithms, what are they?

I know all the properties of a logarithm, how it is defined, what it is used for.

But I have yet to find, or have anyone tell me, what a logarithm is.

I could easly enter this into a calculator, or estimate it on paper.
But how do I do this without estimation, without a calculator or table, just my mind and a pen. And how do I derive that method?

And how where logarithms originally defined? I know there must have been much more rigor and understanding in the original explanations.
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June 21st, 2010, 07:57 PM   #2
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Re: Logarithms, what are they?

Try this hit off of Google: As far as derivation, it is just an inverse operation like add/subtract or multiply/divide. If the log is the inverse of raising to an exponent, then if A=10^B, then log(A)=B. 100=10^2, so log(100)=2. That's the extent of what I can speak to.
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