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character: Nikolai Ivanovich Lobachevsky
topic: Non-Euclidean Geometry
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character: Euclid
topic: Euclidean Geometry
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character: Bernhard Riemann
topic: Riemannian Geometry
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    https://www.yourstory.education/learn?character=Bernhard+Riemann&topic=Riemannian+Geometry
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character: David Hilbert
topic: Foundations of Geometry
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