Roberto Frigerio – författare

The theory of bounded cohomology, introduced by Gromov in the late 1980s, has had powerful applications in geometric group theory and the geometry and topology of manifolds, and has been the topic of active research continuing to this day. This monograph provides a unified, self-contained introduction to the theory and its applications, making it accessible to a student who has completed a first course in algebraic topology and manifold theory. The book can be used as a source for research projects for master's students, as a thorough introduction to the field for graduate students, and as a valuable landmark text for researchers, providing both the details of the theory of bounded cohomology and links of the theory to other closely related areas.The first part of the book is devoted to settling the fundamental definitions of the theory, and to proving some of the (by now classical) results on low-dimensional bounded cohomology and on bounded cohomology of topological spaces. The second part describes applications of the theory to the study of the simplicial volume of manifolds, to the classification of circle actions, to the analysis of maximal representations of surface groups, and to the study of flat vector bundles with a particular emphasis on the possible use of bounded cohomology in relation with the Chern conjecture. Each chapter ends with a discussion of further reading that puts the presented results in a broader context.

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This book starts with a concise but rigorous overview of the basic notions of projective geometry, using straightforward and modern language. The goal is not only to establish the notation and terminology used, but also to offer the reader a quick survey of the subject matter. In the second part, the book presents more than 200 solved problems, for many of which several alternative solutions are provided. The level of difficulty of the exercises varies considerably: they range from computations to harder problems of a more theoretical nature, up to some actual complements of the theory. The structure of the text allows the reader to use the solutions of the exercises both to master the basic notions and techniques and to further their knowledge of the subject, thus learning some classical results not covered in the first part of the book. The book addresses the needs of undergraduate and graduate students in the theoretical and applied sciences, and will especially benefit those readers with a solid grasp of elementary Linear Algebra.

This book starts with a concise but rigorous overview of the basic notions of projective geometry, using straightforward and modern language. The goal is not only to establish the notation and terminology used, but also to offer the reader a quick survey of the subject matter. In the second part, the book presents more than 200 solved problems, for many of which several alternative solutions are provided. The level of difficulty of the exercises varies considerably: they range from computations to harder problems of a more theoretical nature, up to some actual complements of the theory. The structure of the text allows the reader to use the solutions of the exercises both to master the basic notions and techniques and to further their knowledge of the subject, thus learning some classical results not covered in the first part of the book. The book addresses the needs of undergraduate and graduate students in the theoretical and applied sciences, and will especially benefit those readers with a solid grasp of elementary Linear Algebra.

A partire dagli studi sulla prospettiva degli artisti del Rinascimento, la geometria proiettiva si è sviluppata nei secoli successivi come disciplina autonoma che, oltre ad essere alla base della geometria algebrica classica, trova applicazioni in numerosi settori, dall’ingegneria alla computer vision, dall’architettura alla crittografia. La prima parte di questo testo contiene richiami, sintetici ma rigorosi, delle nozioni fondamentali di geometria proiettiva, in un linguaggio semplice e moderno. Ciò offre al lettore una rapida visione d’insieme della materia trattata e lo introduce alle tecniche e alle notazioni successivamente adoperate. Nella seconda parte sono presentati più di 200 problemi risolti, per molti dei quali si propongono più soluzioni alternative. Il livello di difficoltà è variabile: si spazia da esercizi di carattere calcolativo a problemi più impegnativi di carattere teorico, fino a veri e propri teoremi con dimostrazione guidata. La struttura del testo consente al lettore di utilizzare la risoluzione degli esercizi per impadronirsi delle nozioni e delle tecniche di base e per progredire nella conoscenza della materia fino allo studio di alcuni risultati classici.