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• Logarithm - Wikipedia, the free encyclopedia

  In mathematics, the logarithm of a number to a given base is the power or exponent to which the base must be raised in order to produce the number.

• Logarithm -- from Wolfram MathWorld

  The logarithm log_bx for a base b and a number x is defined to be the inverse function of taking b to the power x, i.e., b^x. Therefore, for any x and b, x=log_b(b^x), (1) or ...

• Logarithm

  If b > 0 and b is not equal to 1, and x is any real number, then log b y = x if and only if b x = y. Converting log b y = x into base 10 (base 10 or log)