Caricature of the German mathematician Georg Riemann (1826-1866). Riemann developed a new geometric theory that was very different to the Euclidean theory, which deals only with planes and solids. Riemannian geometry describes higher dimensions, curved surfaces and multiple planes. Fifty years later Einstein was able to show that Riemann's geometry represented a truer picture of the universe as a whole than did Euclid's, when he used it in the construction of relativity theory.
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