Gregor Kemper – författare

This textbook offers a thorough, modern introduction into commutative algebra. It is intented mainly to serve as a guide for a course of one or two semesters, or for self-study. The carefully selected subject matter concentrates on the concepts and results at the center of the field. The book maintains a constant view on the natural geometric context, enabling the reader to gain a deeper understanding of the material. Although it emphasizes theory, three chapters are devoted to computational aspects. Many illustrative examples and exercises enrich the text.

Invariant theory is a subject with a long tradition and an astounding abil­ ity to rejuvenate itself whenever it reappears on the mathematical stage. Throughout the history of invariant theory, two features of it have always been at the center of attention: computation and applications. This book is about the computational aspects of invariant theory. We present algorithms for calculating the invariant ring of a group that is linearly reductive or fi­ nite, including the modular case. These algorithms form the central pillars around which the book is built. To prepare the ground for the algorithms, we present Grabner basis methods and some general theory of invariants. Moreover, the algorithms and their behavior depend heavily on structural properties of the invariant ring to be computed. Large parts of the book are devoted to studying such properties. Finally, most of the applications of in­ variant theory depend on the ability to calculate invariant rings. The last chapter of this book provides a sample of applications inside and outside of mathematics.

This textbook offers a thorough, modern introduction into commutative algebra. It is intented mainly to serve as a guide for a course of one or two semesters, or for self-study. The carefully selected subject matter concentrates on the concepts and results at the center of the field. The book maintains a constant view on the natural geometric context, enabling the reader to gain a deeper understanding of the material. Although it emphasizes theory, three chapters are devoted to computational aspects. Many illustrative examples and exercises enrich the text.

This book is about the computational aspects of invariant theory. Of central interest is the question how the  invariant ring of a given group action can be calculated. Algorithms for this purpose form the main pillars around which the book is built. There are two introductory chapters, one on Gröbner basis methods and one on the basic concepts of invariant theory, which prepare the ground for the algorithms. Then algorithms for computing invariants of finite and reductive groups are discussed. Particular emphasis lies on interrelations between structural properties of invariant rings and computational methods. Finally, the book contains a chapter on applications of invariant theory, covering fields as disparate as graph theory, coding theory, dynamical systems, and computer vision.The book is intended for postgraduate students as well as researchers in geometry, computer algebra, and, of course, invariant theory. The text is enriched with numerous explicit examples which illustrate the theory and should be of more than passing interest.More than ten years after the first publication of the book, the second edition now provides a major update and covers many recent developments in the field. Among the roughly 100 added pages there are two appendices, authored by Vladimir Popov, and an addendum by Norbert A'Campo and Vladimir Popov.

This book is about the computational aspects of invariant theory. Of central interest is the question how the  invariant ring of a given group action can be calculated. Algorithms for this purpose form the main pillars around which the book is built. There are two introductory chapters, one on Gröbner basis methods and one on the basic concepts of invariant theory, which prepare the ground for the algorithms. Then algorithms for computing invariants of finite and reductive groups are discussed. Particular emphasis lies on interrelations between structural properties of invariant rings and computational methods. Finally, the book contains a chapter on applications of invariant theory, covering fields as disparate as graph theory, coding theory, dynamical systems, and computer vision.The book is intended for postgraduate students as well as researchers in geometry, computer algebra, and, of course, invariant theory. The text is enriched with numerous explicit examples which illustrate the theory and should be of more than passing interest.More than ten years after the first publication of the book, the second edition now provides a major update and covers many recent developments in the field. Among the roughly 100 added pages there are two appendices, authored by Vladimir Popov, and an addendum by Norbert A'Campo and Vladimir Popov.

Auf diese Weise lassen sich die Nebenstränge in eine gemeinsame Vorlesung mit der Linearen Algebra integrieren oder bleiben ein optionales Zusatzangebot zur Linearen Algebra für Ergänzungen oder Seminare.Mit über 350 Aufgaben bietet das Buch bei jedem Themengebiet die Gelegenheit zur aktiven Auseinandersetzung mit dem Stoff an.

Lineare Algebra auf den Punkt gebrachtDieses Buch ist bestens geeignet für Studierende als Begleitlektüre und für Lehrende als Grundlage zur Vorlesungsplanung. Es zeichnet sich aus durch eine präzise Darstellung ohne Ausschweifungen.Einzigartig ist die Kombination dreier „Handlungsstränge“: Lineare Algebra als Hauptstrang, diskrete Mathematik und Mengenlehre. Dabei kann der Hauptstrang unabhängig von den beiden anderen Strängen gelesen werden, die jeweils eine solide Einführung in ihre Stoffgebiete beinhalten. Auf diese Weise lassen sich die Nebenstränge in eine gemeinsame Vorlesung mit der Linearen Algebra integrieren oder bleiben ein optionales Zusatzangebot zur Linearen Algebra für Ergänzungen oder Seminare.Die zweite Auflage enthält neben kleineren Anpassungen und Korrekturen weitere Aufgaben und außerdem drei neue Abschnitte: über nichtnegative Matrizen, über Quadriken und über Anwendungen auf das Global Positioning-Problem.Mit über 380 Aufgaben bietet das Buch bei jedem Themengebiet die Gelegenheit zur aktiven Auseinandersetzung mit dem Stoff an. Die Bandbreite umfasst neben vorlesungsbegleitenden Übungsaufgaben auch typische Klausuraufgaben und größere Aufgabenprojekte. Für einige der Aufgaben sind Lösungsvideos verfügbar. Außerdem kommt nun begleitend zur zweiten Auflage ein Übungsbuch heraus, in dem neben den Aufgaben auch vollständige Lösungen gegeben werden.