Example image of eyePlorer eyePlorer map for 'Giovanni Girolamo Saccheri': 1667 1733 Italy October 25 September 5 Society of Jesus Tommaso Ceva Eugenio Beltrami Non-Euclidean geometry Omar Khayyám Saccheri quadrilateral Euclid Parallel postulate Reductio ad absurdum Elliptic geometry Hyperbolic geometry Martin Gardner List of mathematicians (S) G. B. Halsted Saccheri–Legendre theorem List of Italians List of geometers History of manifolds and varieties John Corcoran (logician) Timeline of algebra and geometry Manifold List of Jesuit scientists List of alumni of Jesuit educational institutions Pavia Timeline of mathematics Alhazen History of geometry Mathematics in medieval Islam
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