[Van der Waerden's theorem - Wikipedia](https://en.wikipedia.org/wiki/Van_der_Waerden%27s_theorem) [Van der Waerden number - Wikipedia](https://en.wikipedia.org/wiki/Van_der_Waerden_number) [Schur numbers - Numberphile](https://www.youtube.com/watch?v=57V8Ud7PL8k&t=5s) [Schur's theorem - Wikipedia](https://en.wikipedia.org/wiki/Schur%27s_theorem#Ramsey_theory) [Folkman's theorem - Wikipedia](https://en.wikipedia.org/wiki/Folkman%27s_theorem)
