V2EX associated legendre function

Associated Legendre Function

释义 Definition

伴随勒让德函数:一类特殊函数,通常记作 \(P_\ell^m(x)\)(以及第二类 \(Q_\ell^m(x)\)),是勒让德微分方程在带有“阶数” \(m\) 时的解。它与球谐函数密切相关,常用于物理与工程中的角向问题(如拉普拉斯方程、量子力学中的角动量分离变量)。
(注:在不同语境下也可能泛指“伴随勒让德多项式/函数”的整体体系。)

发音 Pronunciation (IPA)

/sosietd lndr fkn/

例句 Examples

The associated Legendre function appears in the formula for spherical harmonics.
伴随勒让德函数出现在球谐函数的公式中。

When solving Laplace’s equation in spherical coordinates, we often expand the angular part using associated Legendre functions \(P_\ell^m(\cos\theta)\).
在球坐标中求解拉普拉斯方程时,我们常用伴随勒让德函数 \(P_\ell^m(\cos\theta)\) 来展开角向部分。

词源 Etymology

Legendre 来自法国数学家 Adrien-Marie Legendre(让德) 的姓氏;“associated(伴随的)”表示它是在标准勒让德函数/多项式的基础上,引入额外参数(常见为阶 \(m\))而得到的一族相关解,因此称为“伴随勒让德函数”。

相关词 Related Words

文学与经典著作 Literary Works

  • Mathematical Methods for Physicists(Arfken, Weber, Harris):在球谐函数与分离变量章节中系统使用 \(P_\ell^m\)
  • Classical Electrodynamics(J. D. Jackson):多极展开与角向函数处理中出现
  • Handbook of Mathematical Functions(Abramowitz & Stegun):作为特殊函数条目收录并给出性质与表格
  • Methods of Theoretical Physics(Morse & Feshbach):在球坐标解偏微分方程时反复使用
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