V2EX strong limit

Strong Limit

释义 Definition

strong limit(强极限):常用于泛函分析/算子理论中,指一列算子 \(T_n\) 在“强意义”下收敛到算子 \(T\),也就是对空间中每个向量 \(x\),都有
\[ T_n x \to T x. \]
(在不同数学分支里 strong limit 也可能有其他特定含义,例如集合论中的 strong limit cardinal;此处以最常见的“强收敛/强极限”用法为主。)

发音 Pronunciation (IPA)

/str lmt/

词源 Etymology

strong 源自古英语 strang,有“强的、严格的”之意;limit 源自拉丁语 limes(边界、界限)。合起来在数学语境中表达“比某些较弱的收敛概念更严格的极限”,强调“对每个向量都成立”的收敛方式。

例句 Examples

The strong limit exists for this sequence of operators.
这个算子序列的强极限是存在的。

If \(T_n\) are uniformly bounded and \(T_n x\) converges for every \(x\), then \(T\) is the strong limit of \(T_n\).
如果 \(T_n\) 一致有界且对每个 \(x\),\(T_n x\) 都收敛,那么 \(T\) 就是 \(T_n\) 的强极限。

h2>相关词 Related Words

文学与著作 Literary Works

  • Functional Analysis Walter Rudin
  • A Course in Functional Analysis John B. Conway
  • Introductory Functional Analysis with Applications Erwin Kreyszig
  • Methods of Modern Mathematical Physics, Vol. I: Functional Analysis Reed & Simon
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