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parallel postulate: Related Content
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Topics
non-Euclidean geometryparallel linesEuclidean geometrypostulatePythagorean theoremRiemannian geometryhyperbolic geometrytriangle inequalitymethod of exhaustionquadratureside-angle-side theorem
Key People

János Bolyai
Hungarian mathematician

Farkas Bolyai
Hungarian mathematician and writer
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