《线性代数群》讲述了：For this printing, I have corrected some errors and made numerous minor changes in the interest of clarity. The most significant corrections occur in Sections 4.2, 4.3, 5.5, 30.3, 32.1, and 32.3. I have also updated the biblio-graphy to some extent. Thanks are due to a number of readers who took the trouble to point out errors, or obscurities; especially helpful were the detailed ments of Jose Antonio Vargas...
《示性类》内容简介：The text which follows is based mostly on lectures at PrincetonUniversity in 1957. The senior author wishes to apologize for the delayin publication.The theory of characteristic classes began in the year 1935 with almostsimultaneous work by HASSLER WHITNEY in the United States andEDUARD STIEFEL in Switzerland. StiefeI's thesis, written under thedirection of Heinz Hopf, introduced and studied certain "characteristic"homology classes determined by the tangent bundle of a smooth manifold.Whitney, then at Harvard University, treated the case of an arbitrary spherebundle. Somewhat later he invented the language of cohomology theory,hence the concept of a characteristic cohomology class, and proved thebasic product theorem.
《线性代数群》讲述了：For this printing, I have corrected some errors and made numerous minor changes in the interest of clarity. The most significant corrections occur in Sections 4.2, 4.3, 5.5, 30.3, 32.1, and 32.3. I have also updated the biblio-graphy to some extent. Thanks are due to a number of readers who took the trouble to point out errors, or obscurities; especially helpful were the detailed ments of Jose Antonio Vargas...
《学英语入门》由科学工作基本常识(Science Basics)、生命科学(Life Science)、地球科学(Earth Science)~l物理科学(Physical Science)4个大板块构成，收录相关主题55个，每个主题包括]1个小板块： 焦点问题(Focus Question)：以1—2个问题揭示本课主要内容 词汇表(Vocabulary List)：列出4—19个本课最重要的单词 词汇学习(Word Study)：介绍2条词汇学习技巧 语境中的词汇(Vocabulary in Context)：以1篇短文呈现新词意义 阅读(Readings)：以2一Big短文介绍相关的科学信息 理解检查(Check Your Understanding)：提出8个问题，检查对内容的理解 科学技能(Science Skill)：教授l项科学技能，如阅读图表 课程词~E(Academic Vocabulary)：通过例句介绍2—5个近义或相关表达 关键信息(Key Information)：以图表形式呈现本课最重要的科学信息 研究与调查(Research and Inquiry)：提供3个拓展问题，
