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Heron of Alexandria (ca. 75 AD)
scienceworld.wolfram.com
Greek mathematician who was mainly interested in practical studies in mechanics and engineering, best known for Heron's Formula
Klein, Felix (1849-1925)
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Plücker's assistant at Bonn who studied Analytic Geometry, describing geometry as the study of properties of figures which remain invariant under a Group of Transformations. He sy…