<b_jonas> slashlearn euclid//Euclid is a short geeky game in which the goal is to do Euclidean compass and straightedge constructions in as few steps as possible. It runs in the browser, found at "http://www.euclidthegame.com/". It was popular among #esoteric regulars in 2016-07.

Bézout's theorem says that if a system of polynomial equations over the complexes has as many variables as equations, then in the general case the number of solutions it has is equal to the product of one less than the degrees of the polynomials.