**Natural logarithm - Wikipedia**
https://en.wikipedia.org/wiki/Natural_logarithm

The natural logarithm of a number is its logarithm to the base of the mathematical constant e, which is an irrational and transcendental number approximately equal to 2.718 281 828 459. The natural logarithm of x is generally written as ln x, loge x, or sometimes, if the base e is implicit, simply log x. [1] [2] Parentheses are sometimes added ...

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