The best-selling, best known text in Mathematical Economics course, Chiang teaches the basic mathematical methods indispensable for understanding current economic literature. the book's patient explanations are written in an informal, non-intimidating style. To underscore the relevance of mathematics to economics, the author allows the economist's analytical needs to motivate the study of related mathematical techniques; he then illustrates these techniques with appropriate economics models. Graphic illustrations often visually reinforce algebraic results. Many exercise problems serve as drills and help bolster student confidence. These major types of economic analysis are covered: statics, comparative statics, optimization problems, dynamics, and mathematical programming. These mathematical methods are introduced: matrix algebra, differential and integral calculus, differential equations, difference equations, and convex sets. For this fourth edition of a text for students of economics, Chiang (University of Connecticut) and Wainwright (British Columbia Institute of Technology) add new chapters on the envelope theorem, advanced topics in optimization, and optimal control theory, and delete a chapter on mathematical programming. The book can serve as a text for a course on mathematical methods, and as supplementary reading in such courses as micro- or macroeconomic theory, and economic growth and development. This edition is updated with new examples based on current economic conditions.