From: Keynan Pratt <keynan@...>
Date: 2007-02-08T06:57:52+09:00
Subject: Re: Adding Math.log2 and Math.logn to the core library.

perhaps it would be wiser to add

def log_(n, x)
  log x / log n
end

so that any log base may be used.

....

or you could just google the formula like any one else who didn't pay 
attention to  math class.

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