# Tag Archives: algebraic number

## The Number e, Part 1: e is Irrational

(Or would "The Number 1, Part e" be more interesting?!) Let's talk about the number $e$, my favourite number. Of course, to talk about it we need a definition, so we define $e$ as $e = 1/0! + 1/1! + 1/2! + 1/3! + \cdots.$ Exercise: check that this converges! In Part […]