![[Joseph Louis Lagrange]](ncd01152.jpg "16kib jpg detail of a portrait of Joseph Louis Lagrange, date unknown, artist unknown; please do not write to ask about the image")
(1736-1813)
Astronomer.
Supplied the analytic foundation for calculus of variations, did valuable researches on differential equations, and made contributions to the solution of equations particularly by the method of combination.
New Catholic Dictionary
