“Functions in lambda calculus only accept a single input. They’re unary. If you need more than one parameter, the function will take one input and return a new function that takes the next, and so on. The n-ary function (x, y) => x + y can be expressed as a unary function like: x => y => x + y. This…”— Eric Elliott, medium.comTagged: Programming History, Alonzo Church