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Two theorems in the mathematical field of Riemannian geometry bear the name Myers–Steenrod theorem, both from a 1939 paper by Myers and Steenrod.
His remarkable contributions include comparison theorems of Laplacian eigenvalues on Riemannian manifolds, the maximal diameter theorem in Riemannian geometry.
Chow–Rashevskii theorem: In sub-Riemannian geometry, the theorem that asserts that any two points are connected by a horizontal curve.