10 May Tullio Levi-Civita
Dead: 29 December 1941
In: Roma, RM, Italia
He was an Italian mathematician, most famous for his work on absolute differential calculus (tensor calculus) and its applications to the theory of relativity, but who also made significant contributions in other areas.
He was a pupil of Gregorio Ricci-Curbastro, the inventor of tensor calculus.
His work included foundational papers in both pure and applied mathematics, celestial mechanics (notably on the three-body problem), analytic mechanics (the Levi-Civita separability conditions in the Hamilton–Jacobi equation) and hydrodynamics.