Hidehiko Yamabe (山辺 英彦, Yamabe Hidehiko; August 22, 1923, in Ashiya, Hyōgo, Japan – November 20, 1960, in Evanston, Illinois) was a Japanese mathematician. Above all, he is famous for discovering that every conformal class on a smooth compact manifold is represented by a Riemannian metric of constant scalar curvature. Other notable contributions include his definitive solution of Hilbert's fifth problem.
Source: “Hidehiko Yamabe”, English Wikipedia (CC BY-SA 4.0), excerpt