He failed to show that all singular solutions were given by his technique, however, and this was not achieved until four years after his death.
Siya ay nabigo upang ipakita na ang lahat ng isahan solusyon ay binigay sa pamamagitan ng kanyang mga pamamaraan, gayunpaman, at ito ay hindi makakamtan hanggang apat na taon pagkatapos ng kanyang kamatayan.