When1: 1771
When2: 1811
Who: Joseph Louis Lagrange [Lagrange, Joseph Louis]
What: mathematician
Where: Paris, France/Italy
works\ Turin Miscellany [1771]; Analytical Mechanics [1788 and 1811]
Detail: He lived 1736 to 1813 and studied calculus of variations, mean-value theorem, spherical coordinates, solution envelopes, adjoint equations, finite-differences method, and perturbation methods. He solved differential-equation systems using conic-section deviations. Newton's laws can depend on principle of stationary action in Euler-Lagrange equations. Natural numbers are sums of four natural-number squares.
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Date Modified: 2022.0224