He had solved this in the same year that his brother posed the problem and it was his first important mathematical result produced independently of his brother, although it used ideas that Jacob had given when he posed the problem.
Siya ay malulutas ito sa parehong taon na ang kanyang mga kapatid na lalaki posed ang problema at ito ay kanyang unang mahalagang matematiko resulta ginawa malaya ng kanyang mga kapatid na lalaki, kahit na ito ginamit na mga ideya na Jacob had given kapag siya posed ang problema.