网站首页  情感咨询  情感美文  情感百科  情感生活  学习充电  旧版美文

请输入您要查询的词汇:

 

词汇 Pseudometric space
分类 英语词汇 英语翻译词典
释义

Pseudometric space

中文百科

伪度量

对于集X中任意元素x,y,若实值函数d: (X,X) \to R符合以下三个条件,称它为一个伪度量(pseudometric)。

  • d(x,x)=0
  • d(x,y)=d(y,x)
  • d(x,z) \le d(x,y) + d(y,z)

它和一般距离(度量)的定义的分别只在于伪度量容许对于相异的元素x,yd(x,y)=0

  • X为矢量空间,p是半范数,d(x,y)=p(x-y)X的伪度量
  • 有集X,Y,其中Y上有一距离d(Y),设F(X)为所有X \to Y的函数之集,取x_0 \in X,则d(f,g) = d_Y(f(x_0) - g(x_0))是一个F(X)的伪度量。
英语百科

Pseudometric space 伪度量

In mathematics, a pseudometric space or semi-metric space is a generalized metric space in which the distance between two distinct points can be zero. In the same way as every normed space is a metric space, every seminormed space is a pseudometric space. Because of this analogy the term semimetric space (which has a different meaning in topology) is sometimes used as a synonym, especially in functional analysis.

随便看

 

依恋情感网英汉例句词典收录3870147条英语例句词条,基本涵盖了全部常用英语单词的释义及例句,是英语学习的有利工具。

 

Copyright © 2004-2024 Yiyi18.com All Rights Reserved
京ICP备2021023879号 更新时间:2025/8/8 4:09:20