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出典:Wiktionary
出典:『Wiktionary』 (2011/09/02 07:31 UTC 版)
出典:『Wiktionary』 (2025/12/31 20:44 UTC 版)
non-Euclidean geometry (countable and uncountable, plural non-Euclidean geometries)
出典:Wikipedia
出典:『Wikipedia』 (2011/07/24 11:39 UTC 版)
A non-Euclidean geometry is the study of shapes and constructions that do not map directly to any n-dimensional Euclidean system, characterized by a non-vanishing Riemann curvature tensor. Examples of non-Euclidean geometries include the hyperbolic and elliptic geometry, which are contrasted with a Euclidean geometry.