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pseudosphere
In geometry, the term pseudosphere is used to describe various surfaces with constant negative Gaussian curvature. Depending on context, it can refer to either a theoretical surface of constant negative curvature, to a tractricoid, or to a hyperboloid.
== Theoretical pseudosphere ==
In its general interpretation, a pseudosphere of radius ''R'' is any surface of curvature −1/''R''2, by analogy with the sphere of radius ''R'', which is a surface of curvature 1/''R''2. The term was introduced by Eugenio Beltrami in his 1868 paper on models of hyperbolic geometry.〔
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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