# Definitions for **natural logarithm**

### This page provides all possible meanings and translations of the word **natural logarithm**

### Princeton's WordNet

natural logarithm, Napierian logarithm(noun)

a logarithm to the base e

### Wiktionary

natural logarithm(Noun)

The logarithm in base e; either the function that given returns such that or the value of .

**Origin:** From log naturalis, coined in 1668 by Nicholas Mercator in his book Logarithmo-technica.

### Freebase

Natural logarithm

The natural logarithm is the logarithm to the base e, where e is an irrational and transcendental constant approximately equal to 2.718281828. The natural logarithm is generally written as ln x, loge x or sometimes, if the base of e is implicit, as simply log x. Parentheses are sometimes added for clarity, giving ln(x), loge(x) or log(x). This is done in particular when the argument to the logarithm is not a single symbol, in order to prevent ambiguity. The natural logarithm of a number x is the power to which e would have to be raised to equal x. For example, ln is 2, because e²=7.389.... The natural log of e itself is 1 because e¹ = e, while the natural logarithm of 1 is 0, since e0 = 1. The natural logarithm can be defined for any positive real number a as the area under the curve y = 1/x from 1 to a. The simplicity of this definition, which is matched in many other formulas involving the natural logarithm, leads to the term "natural." The definition can be extended to non-zero complex numbers, as explained below. The natural logarithm function, if considered as a real-valued function of a real variable, is the inverse function of the exponential function, leading to the identities:

# Translations for **natural logarithm**

### From our Multilingual Translation Dictionary

- natürlicher LogarithmusGerman
- logaritmo naturalSpanish
- luonnollinen logaritmiFinnish
- logarithme népérien, logarithme naturelFrench
- természetes alapú logaritmusHungarian
- náttúrlegur logriIcelandic
- 自然対数Japanese
- природен логаритамMacedonian
- logaritmo naturalPortuguese
- logaritmi naturali, logaritm naturalRomanian
- натуральный логарифмRussian
- prirodni logaritamSerbo-Croatian
- naturliga logaritmenSwedish

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"natural logarithm." *Definitions.net.* STANDS4 LLC, 2014. Web. 22 Dec. 2014. <http://www.definitions.net/definition/natural logarithm>.