His first paper on the theory of equations Sur plusieurs classes d'équations de tous les degrés qui admettent une solution algébrique examined how a single equation in a single unknown could be attacked by writing it as two equations in two unknowns.
Kanyang unang papel sa teorya ng equation Sur plusieurs klase d'equation de tous les degrés Huweb admettent une solusyon algébrique napagmasdan kung paano ang isang equation sa isang hindi kilala ay maaaring attacked sa pamamagitan ng pagsulat ito bilang dalawang equation sa dalawang unknowns.