Non-Euclidean geometry, literally any geometry that is not the same as Euclidean geometry. Although the term is frequently used to refer only to hyperbolic geometry, common usage includes those few geometries (hyperbolic and spherical) that differ from but are very close to Euclidean geometry.
Non-Euclidean geometry - MacTutor History of Mathematics
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Janos Bolyai, Non-Euclidean Geometry, and the Nature of Space: Gray, Professor of History of Mathematics Jeremy J: 9780262571746: : Books
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Hyperbolic geometry - Simple English Wikipedia, the free encyclopedia
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Euclidean Geometry
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Non-Euclidean Geometry Overview & Examples
