Original French pamphlet on the impossibility of solving the general quintic equation by radicals.
Primary-work index and verified attribution: abelprize.no/page/work-niels-henrik-abel . The complete original title continues: où on démontre l'impossibilité de la résolution de l'équation générale du cinquième dégré. Cited passage: title and principal impossibility statement; no uninspected proof-page locator is asserted.