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  See:     Logarithm     -  Wikipedia         The logarithm is the inverse function to exponentiation. That means that the logarithm of a number x to the base b is the exponent to which b must be raised to produce x.   For example, since 1000 = 103,
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   source         The  slide rule  is based on the work on logarithms by John Napier and was invented by William Oughtred.  Before electronic calculators were developed, slide rules were the tool used most often in science and engineering.  The use o
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