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・ Pseudospeciation
・ Pseudospectral knotting method
・ Pseudospectral optimal control
・ Pseudospectrum
・ Pseudosphaerodes
・ Pseudosphaerodon
・ Pseudosphecosoma
・ Pseudosphenoptera
・ Pseudosphenoptera almonia
・ Pseudosphenoptera basalis
・ Pseudosphenoptera boyi
・ Pseudosphenoptera chimaera
・ Pseudosphenoptera chrysorrhoea
・ Pseudosphenoptera cocho
・ Pseudosphenoptera nephelophora
Pseudosphere
・ Pseudosphetta
・ Pseudosphex
・ Pseudosphex aequalis
・ Pseudosphex analis
・ Pseudosphex atridorsata
・ Pseudosphex augusta
・ Pseudosphex aurantivena
・ Pseudosphex caurensis
・ Pseudosphex consobrina
・ Pseudosphex cosmosomoides
・ Pseudosphex discoplaga
・ Pseudosphex dycladioides
・ Pseudosphex eumenoides
・ Pseudosphex faveria


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Pseudosphere : ウィキペディア英語版
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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