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    5 June 1993
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    Brahmagupta
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    fifth postulate
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    Lobachevskian geometry
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    non-Euclidean geometry
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    space
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    spherical geometry
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    sundials
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    Theory of parallels
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    Geometric transformations
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    multidimensional spaces
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    curvature of space
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    Groups of transformations
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    algebra
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