2024 Putnam Math Competition - Question A2 - Polynomials with p(p(x)) - x = (p(x) - x)^2 * q(x)

From a channel Lumen includes in full: Nathaniel Johnston, a maths professor, posts full lecture courses in linear algebra, advanced linear algebra and applied calculus.

A 18-minute video from Nathaniel Johnston's catalogue; the title names its topic.

Video by Nathaniel Johnston, played through YouTube's embedded player.