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.

本书系统讲解偏微分方程及其定解问题的求解方法，通过大量实例讨论偏微分方程解的性质，特别强调傅里叶级数在求解边值问题中的作用。书中配有丰富的例题与习题，还采用“专题问题”较为系统地研究某个具体问题，补充和扩展了正文内容。 本书内容丰富、推导严密，包含大量物理背景，为理解和掌握偏微分方程提供了有效途径。本书可作为高等院校数学及相关专业学生的偏微分方程课程教材，同时也可作为工程技术人员、科技工作者的参考书。

《希尔伯特空间及其应用导论(第3版)(英文版)》无论是学生还是科研人员，都将从《希尔伯特空间及其应用导论(第3版)(英文版)》的特别表达中受益。《希尔伯特空间及其应用导论(第3版)(英文版)》在原来版本的基础上做了不少改动，新增加了一部分讲述Sobolev空间，展开讲述了有限维赋范空间，有关小波的一章做了全面更新。并且包括了积分和微分方程、量子力学、化、变分和控制问题、逼近理论问题、非线性不稳定性和分岔理论的多种应用。在众多希尔伯特空间的书中，《希尔伯特空间及其应用导论(第3版)(英文版)》在讲述勒贝格积分方面独具特色。学习泛函分析和希尔伯特理论的老师和学生都十分推崇这本书作为教材或者参考书。

本书系统而全面地介绍了复分析的基本理论和方法及其在工程问题上的应用，且注重理论与实际密切结合。全书共分八章：复数，解析函数，初等函数，复积分，解析函数的级数表示，留数理论，共形映射，应用数学的变换。为了便于读者掌握本书的主要内容，在每章后面都给出了小结和参考文献，并且配备了大量的例题和练习，书末有练习答案和提示。

This is primarily a textbook on mathematical analysis forgraduate students in economics. While there are a large number ofexcellent textbooks on thiroad topic in the mathematicsliterature， most ofthese texts are overly advanced relative to theneeds of the vast majority of economics students and concentrate onvarious topics that are not readily helpful for studying economictheory. Moreover， it seems that most economics students lack thetime or courage to enroll in a math course at the graduatelevel. Sometimes this is not even for bad reasons， for only fewmath departments offer classes that are designed for the parhcularneeds of economists. Unfortunately，more often than not， theconsequent lack ofmathematical background cre-ates problems for thestudents at a later stage of their education， since an exceedinglylarge fraction ofeconomic theory is imperable without somerigorouackground in real analysis. The present text aims atproviding a remedy for this inconvenient situation.

《希尔伯特空间及其应用导论(第3版)(英文版)》无论是学生还是科研人员，都将从《希尔伯特空间及其应用导论(第3版)(英文版)》的特别表达中受益。《希尔伯特空间及其应用导论(第3版)(英文版)》在原来版本的基础上做了不少改动，新增加了一部分讲述Sobolev空间，展开讲述了有限维赋范空间，有关小波的一章做了全面更新。并且包括了积分和微分方程、量子力学、化、变分和控制问题、逼近理论问题、非线性不稳定性和分岔理论的多种应用。在众多希尔伯特空间的书中，《希尔伯特空间及其应用导论(第3版)(英文版)》在讲述勒贝格积分方面独具特色。学习泛函分析和希尔伯特理论的老师和学生都十分推崇这本书作为教材或者参考书。