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单词 Extremal length
释义

Extremal length

中文百科

极值长度

数学上,共形和拟共形映射的理论中,一个曲线族\Gamma极值长度\Gamma的一个共形不变量。确切来说,设 D是复平面中的开集,\GammaD中的路径族,f:D\to D'是一个共形映射。那么\Gamma的极值长度等于 \Gamma f下的像的极值长度。因此极值长度是研究共形映射的有用工具。

英语百科

Extremal length 极值长度

In the mathematical theory of conformal and quasiconformal mappings, the extremal length of a collection of curves \Gamma is a measure of the size of \Gamma that is invariant under conformal mappings. More specifically, suppose that D is an open set in the complex plane and \Gamma is a collection of paths in D and f:D\to D' is a conformal mapping. Then the extremal length of \Gamma is equal to the extremal length of the image of \Gamma under  f. One also works with the conformal modulus of \Gamma, the reciprocal of the extremal length. The fact that extremal length and conformal modulus are conformal invariants of \Gamma makes them useful tools in the study of conformal and quasi-conformal mappings. One also works with extremal length in dimensions greater than two and certain other metric spaces, but the following deals primarily with the two dimensional setting.

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更新时间:2025/6/23 4:46:42