Euler's Number is Transcendental/Historical Note

Historical Note on $e$ is Transcendental
The transcendental nature of Euler's number $e$ was conjectured by in $1844$, after he had proved that it was not the root of a quadratic equation with integer coefficients.

The proof that $e$ is transcendental was first achieved by in $1873$.

The proof given here is a simplified version of 's original proof, given by.