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单词 Hopf bundle
释义

Hopf bundle

中文百科

霍普夫纤维化 Hopf fibration

(重定向自Hopf bundle)

在拓扑学中,霍普夫纤维化Hopf fibration,亦称霍普夫纤维丛)是最早提出的纤维化,其中的纤维是圆圈(1-球面,S),基空间是三维空间中的球面(2-球面,S),而全空间是四维空间中的超球面(3-球面,S)。容易验证,它是非平凡的。即全空间S与积空间S×S不是拓扑同构的。

英语百科

Hopf fibration 霍普夫纤维化

(重定向自Hopf bundle)
The Hopf fibration can be visualized using a stereographic projection of S3 to R3 and then compressing R3 to a ball.  This image shows points on S2 and their corresponding fibers with the same color.
Pairwise linked keyrings mimic part of the Hopf fibration.
The fibers of the Hopf fibration stereographically project to a family of Villarceau circles in R3.

In the mathematical field of topology, the Hopf fibration (also known as the Hopf bundle or Hopf map) describes a 3-sphere (a hypersphere in four-dimensional space) in terms of circles and an ordinary sphere. Discovered by Heinz Hopf in 1931, it is an influential early example of a fiber bundle. Technically, Hopf found a many-to-one continuous function (or "map") from the 3-sphere onto the 2-sphere such that each distinct point of the 2-sphere comes from a distinct circle of the 3-sphere (Hopf 1931). Thus the 3-sphere is composed of fibers, where each fiber is a circle — one for each point of the 2-sphere.

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更新时间:2025/6/19 11:47:21