《积分表、级数与产品》编排挑战:难以模仿字典的公式体系

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《积分、级数与产品表》第七版是一本详尽的数学工具书,主要关注于三角函数积分以及其他复杂数学公式的研究。这本书由I.S.格拉德舍夫和I.M.里兹希克编写,两位作者在积分理论领域享有盛誉。编辑工作由艾伦·杰弗里和丹尼尔·兹维尔京共同完成,他们分别来自英国纽卡斯尔大学和美国伦斯勒理工学院。 该书的核心内容围绕着积分公式、无穷级数和复杂数学产品的整理,旨在提供一个方便快捷的查询系统,类似于数学词典。然而,由于积分公式本身的复杂性和多样性,设计出一个既逻辑清晰又涵盖所有重要公式的分类体系并非易事。例如,书中探讨的问题是如何高效地组织公式,包括如何决定哪些特定公式(如定积分)应被归入哪个类别,这是一个相当具有挑战性的任务。 书中提到的"任意公式的形式"可能指的是通用积分表达式,其中涉及各种三角函数、幂函数或其他复合函数的积分。这些公式可能包括但不限于基本积分公式(如三角函数的基本积分、幂函数积分、椭圆函数积分等)、特殊函数积分(如伽马函数、贝塞尔函数等)、以及更高级的技术性积分,如傅里叶变换或拉普拉斯变换的积分表示。 《积分、级数与产品表》第七版不仅提供了大量的计算公式,还可能包含它们的应用场景、证明方法、变型和拓展,以便读者能够迅速找到所需的信息,进行深入研究或者解决实际问题。此外,版权信息表明,本书的印刷材料采用酸碱度中和的纸张,以保护长期保存时的耐久性,并强调了未经许可不得复制或传播内容的法律要求。 这是一本不可或缺的参考资料,对于数学、物理学、工程学等领域的工作人员来说,无论是教学还是研究,它都提供了丰富的三角函数积分公式库和相关知识,极大地便利了专业人士在计算和理论分析中的查阅和应用。

For macroscopically anisotropic media in which the variations in the phase stiffness tensor are small, formal solutions to the boundary-value problem have been developed in the form of perturbation series (Dederichs and Zeller, 1973; Gubernatis and Krumhansl, 1975 ; Willis, 1981). Due to the nature of the integral operator, one must contend with conditionally convergent integrals. One approach to this problem is to carry out a “renormalization” procedure which amounts to identifying physically what the conditionally convergent terms ought to contribute and replacing them by convergent terms that make this contribution (McCoy, 1979). For the special case of macroscopically isotropic media, the first few terms of this perturbation expansion have been explicitly given in terms of certain statistical correlation functions for both three-dimensional media (Beran and Molyneux, 1966 ; Milton and Phan-Thien, 1982) and two-dimensional media (Silnutzer, 1972 ; Milton, 1982). A drawback of all of these classical perturbation expansions is that they are only valid for media in which the moduli of the phases are nearly the same, albeit applicable for arbitrary volume fractions. In this paper we develop new, exact perturbation expansions for the effective stiffness tensor of macroscopically anisotropic composite media consisting of two isotropic phases by introducing an integral equation for the so-called “cavity” strain field. The expansions are not formal but rather the nth-order tensor coefficients are given explicitly in terms of integrals over products of certain tensor fields and a determinant involving n-point statistical correlation functions that render the integrals absolutely convergent in the infinite-volume limit. Thus, no renormalization analysis is required because the procedure used to solve the integral equation systematically leads to absolutely convergent integrals. Another useful feature of the expansions is that they converge rapidly for a class of dispersions for all volume fractions, even when the phase moduli differ significantly.

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