在数学领域，希尔伯特空间是欧几里德空间的一个推广，其不再局限于有限维的情形。与欧几里德空间相仿，希尔伯特空间也是一个内积空间，其上有距离和角的概念。此外，希尔伯特空间还是一个完备的空间，其上所有的柯西列等价于收敛列，从而微积分中的大部分概念都可以无障碍地推广到希尔伯特空间中。希尔伯特空间为基于任意正交系上的多项式表示的傅立叶级数和傅立叶变换提供了一种有效的表述方式，而这也是泛函分析的核心概念之一。希尔伯特空间是公式化数学和量子力学的关键性概念之一。这本《希尔伯特空间导论》(作者勇)是英文导论本。

This book is the oute of several courses and seminar talks held at the Instituto de Matematica Pura e Aplicada (IMPA) over the years.It is a greatly modified version of a previous work by the authors,Equacoes Diferenciais Parciais, Uma lntroducao, (Projeto Euclides, IMPA,1978). It has a twofold purpose, namely to introduce the student to the basic concepts of Fourier analysis and provide illustrations of recent applications where these concepts were used to study various properties of the solutions of some important nonlinear evolution equations.

A carefully prepared account of thebasic ideas in Fourier analysis and its applications to the studyof partial differential equations. The author succeeds to make hisexposition accessible to readers with a limited background, forexample, those not acquainted with the Lebesgue integral. Readersshould be familiar with calculus, linear algebra, and plexnumbers. At the same time, the author has managed to includediscussions of more advanced topics such as the Gibbs phenomenon,distributions, Sturm-Liouville theory, Cesaro summability andmulti-dimensional Fourier analysis, topics which one usually doesnot find in books at this level. A variety of worked examples andexercises will help the readers to apply their newly acquiredknowledge.

本书是世界知名统计学家的力作，主要内容有多元正态分布、方差分析、回归分析、因子分析、椭球等高分布、相依性模式、图模型。附录中还列出了矩阵理论、Wilk似然准则和其他常用检验的显著性水平的分位数。 本书在世界各高等学校中广为采用，是一本经典的多元统计分析课程的教材，也可供相关统计研究人员、应用多元统计的科技工作者参考。

本书系统地介绍了补偿列紧方法在单个守恒律方程和一些双曲守恒律系统中的应用。主要内容包括：单个守恒律方程的解，二次流系统、LeRoux系统、等熵气体动力学系统、一维欧拉方程组和弹性力学系统等双曲守恒律系统的解以及弹性力学系统的解，双曲守恒律系统的零松弛现象。

Nonsmooth analysis refers to differential analysis in the absence of differentiability. It can be regarded as a subfield of that vast subject known as nonlinear analysis. While nonsmooth analysis has classical roots (we claim to have traced its lineage hack to Dini), it is only in the last decades that the subject has grown rapidly. To the point, in fact, that further development has sometimes appeared in danger of being stymied, due to the plethora of definitions and unclearly related theories.