freeCodeCamp/guide/english/mathematics/e-eulers-number/index.md

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title: E Eulers Number
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## E Eulers Number
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Euler's Number, 2.71828, is a famous irrational mathematical constant that serves as the base of the natural logarithm. It is named after the Swiss mathematician, Leonhard Euler, and it can be identified with the following symbol, &#8455;. This number has many important uses and roles in mathematics and is applied in calculating compound interest, for example. You would use Euler's Number in calculus in order to be able to perform differential and integral calculus with exponential functions and logarithms.
![Leonhard_Euler Image](https://github.com/TomerPacific/fccGuideImages/blob/master/Leonhard_Euler.jpg?raw=true)
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To read more about Euler's Number, you can go here : https://en.wikipedia.org/wiki/E_(mathematical_constant