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Euler's number

The Euler number e = 2.7182… is the limit



We start with the exponential function

Substitution in the definition of the derivative gives

and so

For x = 0 this becomes

That is a constant, as there is no x in it. The value depends only on a, the base. You can therefore write

We want to know, for what value of a the function f ′(0) = 1, because then is f ′(x) = ax, and the function is it's own derivative. So we start the calculation of

Multiplcation with h


Exponentiation of both sides

This is

Let , and because → 0 gives this → ∞, and so



The mathematician Leonhardt Euler (1707 - 1783) is famous for his contributions on this constant.

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