Andrew McLennan – författare

What a wonderful occasion it is to be celebrating 65 years of Hugo Sonnenschein! Given his many contributions to economic research and academia more broadly, there is much to celebrate. This volume, presented to Hugo at a confer­ ence in his honor at the University of Chicago in October 2005, highlights one of his deepest contributions. It is perhaps the hardest to detect from reading his bios and vita; but something that he is famous for among economists in general and economic theorists in particular. It is his incredible record as a mentor and advisor of students. In putting this volume together, we have collected papers from Hugo's students with the aim of demonstrating his tremendous impact as an advisor. The papers span decades, with the earliest coming from his advisees in the first years of his career and the most recent coming in the last two years after his return to research and advising that followed his adventures as a university administrator. The con­ tributors include not only his graduate advisees, but also some of his undergraduate advisees and still others who did not have him as an advisor, but nonetheless con­ sider him a primary mentor in their training as economic theorists. Each paper is accompanied with a brief preface by the student that provides background on the paper and indicates Hugo's influence on its genesis.

What a wonderful occasion it is to be celebrating 65 years of Hugo Sonnenschein! Given his many contributions to economic research and academia more broadly, there is much to celebrate. This volume, presented to Hugo at a confer­ ence in his honor at the University of Chicago in October 2005, highlights one of his deepest contributions. It is perhaps the hardest to detect from reading his bios and vita; but something that he is famous for among economists in general and economic theorists in particular. It is his incredible record as a mentor and advisor of students. In putting this volume together, we have collected papers from Hugo''s students with the aim of demonstrating his tremendous impact as an advisor. The papers span decades, with the earliest coming from his advisees in the first years of his career and the most recent coming in the last two years after his return to research and advising that followed his adventures as a university administrator. The con­ tributors include not only his graduate advisees, but also some of his undergraduate advisees and still others who did not have him as an advisor, but nonetheless con­ sider him a primary mentor in their training as economic theorists. Each paper is accompanied with a brief preface by the student that provides background on the paper and indicates Hugo''s influence on its genesis.

What a wonderful occasion it is to be celebrating 65 years of Hugo Sonnenschein! Given his many contributions to economic research and academia more broadly, there is much to celebrate. This volume, presented to Hugo at a confer­ ence in his honor at the University of Chicago in October 2005, highlights one of his deepest contributions. It is perhaps the hardest to detect from reading his bios and vita; but something that he is famous for among economists in general and economic theorists in particular. It is his incredible record as a mentor and advisor of students. In putting this volume together, we have collected papers from Hugo's students with the aim of demonstrating his tremendous impact as an advisor. The papers span decades, with the earliest coming from his advisees in the first years of his career and the most recent coming in the last two years after his return to research and advising that followed his adventures as a university administrator. The con­ tributors include not only his graduate advisees, but also some of his undergraduate advisees and still others who did not have him as an advisor, but nonetheless con­ sider him a primary mentor in their training as economic theorists. Each paper is accompanied with a brief preface by the student that provides background on the paper and indicates Hugo's influence on its genesis.

This book develops the central aspect of fixed point theory – the topological fixed point index – to maximal generality, emphasizing correspondences and other aspects of the theory that are of special interest to economics. Numerous topological consequences are presented, along with important implications for dynamical systems.The book assumes the reader has no mathematical knowledge beyond that which is familiar to all theoretical economists. In addition to making the material available to a broad audience, avoiding algebraic topology results in more geometric and intuitive proofs.Graduate students and researchers in economics, and related fields in mathematics and computer science, will benefit from this book, both as a useful reference and as a well-written rigorous exposition of foundational mathematics. Numerous problems sketch key results from a wide variety of topics in theoretical economics, making the book an outstandingtext for advanced graduate courses in economics and related disciplines.

This book develops the central aspect of fixed point theory – the topological fixed point index – to maximal generality, emphasizing correspondences and other aspects of the theory that are of special interest to economics. Numerous topological consequences are presented, along with important implications for dynamical systems.The book assumes the reader has no mathematical knowledge beyond that which is familiar to all theoretical economists. In addition to making the material available to a broad audience, avoiding algebraic topology results in more geometric and intuitive proofs.Graduate students and researchers in economics, and related fields in mathematics and computer science, will benefit from this book, both as a useful reference and as a well-written rigorous exposition of foundational mathematics. Numerous problems sketch key results from a wide variety of topics in theoretical economics, making the book an outstandingtext for advanced graduate courses in economics and related disciplines.