http://olivernash.org/2018/07/08/poring-over-poncelet/ хороше | Непрерывное математическое образование

http://olivernash.org/2018/07/08/poring-over-poncelet/

хорошее обсуждение доказательств теоремы Понселе и формулы Кэли + файлы оригинальных статей

«Poncelet's Porism has a lot going for it. It turns out to be an archetypal result demonstrating the power of “modern” algebraic geometry, it admits numerous fruitful generalisations, and it has connections to many beautiful subjects including elliptic curves, modular forms, dynamical systems, the Painlevé equations, and even instantons. But there is another reason for its popularity: it asserts the existence of some very appealing pictures and animations.»