Definition:Euler's Number

As the Base of the Natural Logarithm
As the base of the Natural Logarithm:

In Terms of the Exponential Function
In terms of the exponential function:

Also see

 * Equivalence of Definitions of Euler's Number


 * Euler's Number is Irrational


 * Euler's Number is Transcendental


 * Do not confuse with Euler's constant, also known as the Euler-Mascheroni constant


 * $\pi$ (Pi), the other of the two most famous irrational constants in mathematics.