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The natural logarithm of a number is its logarithm to the base of the mathematical constant e, where e is an irrational and transcendental number approximately equal to 2.718281828459. The natural logarithm of x is generally written as ln x, loge x, or sometimes, if the base e is implicit, simply log x.
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"Natural Logarithm Calculator" Math @ STANDS4. STANDS4 LLC, 2018. Web. 20 Oct. 2018. <http://math.stands4.com/calculators/natural-logarithm>.