V2EX uniform convergence

Uniform Convergence

释义 Definition

一致收敛:在数学分析中,一列函数 \(f_n(x)\) 收敛到函数 \(f(x)\) 时,如果对所有 \(x\) 在给定集合上的误差 \(|f_n(x)-f(x)|\) 都能被同一个 \(N\) 同时控制(即与 \(x\) 无关),则称为一致收敛。它比“逐点收敛”更强,常用于保证极限与连续、积分、求导等运算可交换。

发音 Pronunciation (IPA)

/junfrm knvdns/

例句 Examples

The series of functions does not have uniform convergence on this interval.
这列函数在这个区间上不是一致收敛的。

Because of uniform convergence, we can interchange the limit and the integral without changing the result.
由于一致收敛,我们可以交换极限与积分的顺序而不改变结果。

词源 Etymology

uniform 源自拉丁语 uniformisuni- “一” + -formis “形状/形式”),表示“统一的、同样的”;convergence 来自拉丁语 convergerecon- “共同” + vergere “趋向”),表示“汇聚、趋同”。合在一起,“unifom convergence”直译为“以同一种方式发生的收敛”,强调收敛的“整齐一致”、不依赖于具体点 \(x\)。

相关词 Related Words

文学与名著用例 Literary & Notable Works

  • Principles of Mathematical Analysis(Walter Rudin)
  • Real and Complex Analysis(Walter Rudin)
  • Calculus, Vol. 1(Tom M. Apostol)
  • Complex Analysis(Lars Ahlfors)
  • Introduction to Real Analysis(Robert G. Bartle & Donald R. Sherbert)
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