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Riemann, Georg Friedrich Bernhard (1826-1866) - http://turnbull.dcs.st-and.ac.uk/history/Mathematicians/Riemann.html
Theory of functions, non-Euclidian geometry, relativity theory, Famous for the Riemann hypothesis about the behavior of zeros of the Riemann zeta function, which he showed determines the distribution of prime numbers. |
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Steiner, Jakob (1796-1863) - http://turnbull.dcs.st-and.ac.uk/history/Mathematicians/Steiner.html
Was one of the greatest contributors to projective geometry. |
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Klein, Felix (1849-1925) - http://scienceworld.wolfram.com/biography/KleinFelix.html
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 systemized Non-Euclidean Geometry. |
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Heron of Alexandria (ca. 75 AD) - http://scienceworld.wolfram.com/biography/Heron.html
Greek mathematician who was mainly interested in practical studies in mechanics and engineering, best known for Heron's Formula |
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Apollonius of Perga (c. 262-190 B.C.) - http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Apollonius.html
known as 'The Great Geometer', great influence on the development of mathematics, famous book Conics introduced terms such as parabola, ellipse and hyperbola. |