Foundations of Geometry: Euclidean, Bolyai-Lobachevskian, and Projective Geometry (Dover Books on Mathematics)
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Lobachevskian geometry
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THEORY OF GROUPS AND SYMMETRIES: FINITE GROUPS, LIE GROUPS, AND LIE ALGEBRAS
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A sketch of the fundamentals of Lobachevskian geometry
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Lobachevskian Bridge
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Foundations of Geometry: Euclidean and Bolyai-Lobachevskian Geometry. Projective Geometry
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Foundations of Geometry. Part I: Euclidean and Bolyai - Lobachevskian Geometry. Part II: Projective Geomertry.
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