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单词 pseudosphere
释义

Pseudosphere


Pseu´do`sphere`


n.1.(Geom.) The surface of constant negative curvature generated by the revolution of a tractrix. This surface corresponds in non-Euclidian space to the sphere in ordinary space. An important property of the surface is that any figure drawn upon it can be displaced in any way without tearing it or altering in size any of its elements.

Pseudosphere


pseudosphere

[′süd·ə‚sfir] (mathematics) The pseudospherical surface generated by revolving a tractrix about its asymptote.

Pseudosphere

 

the surface of constant negative curvature formed by the rotation of a tractrix about its asymptote (see Figure 1). Its name emphasizes both its similarity to and difference from a sphere, which is an example of a surface with constant positive curvature. The pseudosphere is of particular interest because figures drawn on smooth parts of this surface

obey the laws of Lobachevskian non-Euclidean geometry. This fact, established in 1868 by E. Beltrami, was of great importance in the dispute over the reality of Lobachevskian geometry.

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更新时间:2025/3/3 5:09:33