2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/69233We discuss the history of attempts to solve the Pell equation using certain auxiliary equations that correspond, in modern terminology, to a second 2-descent.11 pagesNumber TheoryHistory and Overview11D09; 11R11Higher Descent on Pell Conics II. Two Centuries of Missed Opportunitiestext