The natural logarithm of a number is its logarithm to the base e, where e is an irrational and transcendental constant approximately equal to 2.718281828. The natural logarithm of x is generally written as ln x, loge x, or sometimes, if the base e is implicit, simply log x. Parentheses are sometimes added for clarity, giving ln(x), loge(x) or log(...
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http://en.wikipedia.org/wiki/Natural_logarithm
(from the article `logarithm`) ...for more than 300 years, until the perfection of mechanical calculating machines in the late 19th century and computers in the 20th century ... Scottish mathematician and theological writer who originated the concept of logarithms as a mathematical device to aid in calculations.[2 related articles]
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http://www.britannica.com/eb/a-z/n/17
Logarithm to the base e (approximately 2.7183).
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http://www.duke.edu/~charvey/Classes/wpg/bfglosn.htm
Logarithm to the base e (approximately 2.7183).
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http://www.encyclo.co.uk/local/20047
Logarithm to the base e (approximately 2.7183).
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http://www.encyclo.co.uk/local/22402
[
n] - a logarithm to the base e
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http://www.webdictionary.co.uk/definition.php?query=natural%20logarithm
Napierian logarithm noun a logarithm to the base e
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https://www.encyclo.co.uk/local/20974
In mathematics, the exponent of a number expressed to base e, where e represents the irrational number 2.71828... . Natural logarithms are also called Napierian logarithms, after their inventor, the Scottish mathematician John Napier
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a logarithm having e as a base. Symbol: ln Also calledCf.
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https://www.infoplease.com/dictionary/natural-logarithm
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