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logarithm
The logarithm of a number or variable x to base b, logb x, is the exponent of b needed to give x. The bases most commonly used in mathematics are e and 10. A logarithm to base e, written as log x or ln x, is known as a natural logarithm. A logarithm to base 10 is written as log10 x and is known as a common logarithm.
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