MathType on X: "The Abel-Ruffini theorem proves that it is impossible to find a closed formula using radicals and basic operations for the roots of polynomials of degree >4. #MathType https://t.co/MltIFM2Se6" /
Transformation d'Abel — Les-mathematiques.net
Théorèmes d'Abel et taubérien faible
LIVRE IX. - Théorème d'Abel - Deutsche Digitale Bibliothek