Cox rings are significant global invariants of algebraic varieties, naturally generalizing homogeneous coordinate rings of projective spaces. This book provides a largely self-contained introduction to Cox rings, with a particular focus on concrete aspects of the theory. Besides the rigorous presentation of the basic concepts, other central topics include the case of finitely generated Cox rings and its relation to toric geometry; various classes of varieties with group actions; the surface case; and applications in arithmetic problems, in particular Manin's conjecture. The introductory chapters require only basic knowledge in algebraic geometry. The more advanced chapters also touch on algebraic groups, surface theory, and arithmetic geometry. Each chapter ends with exercises and problems. These comprise mini-tutorials and examples complementing the text, guided exercises for topics not discussed in the text, and, finally, several open problems of varying difficulty.
Ivan Arzhantsev received his doctoral degree in 1998 from Lomonosov Moscow State University and is a professor in its department of higher algebra. His research areas are algebraic geometry, algebraic groups and invariant theory. Ulrich Derenthal received his doctoral degree in 2006 from Universitat Gottingen. He is a professor of mathematics at Ludwig-Maximilians-Universitat Munchen. His research interests include arithmetic geometry and number theory. Jurgen Hausen received his doctoral degree in 1995 from Universitat Konstanz. He is a professor of mathematics at Eberhard-Karls-Universitat Tubingen. His field of research is algebraic geometry, in particular algebraic transformation groups, torus actions, geometric invariant theory and combinatorial methods. Antonio Laface received his doctoral degree in 2000 from Universit... degli Studi di Milano. He is an associate professor of mathematics at Universidad de Concepcion. His field of research is algebraic geometry, more precisely linear systems and algebraic surfaces and their Cox rings.
Introduction; 1. Basic concepts; 2. Toric varieties and Gale duality; 3. Cox rings and combinatorics; 4. Selected topics; 5. Surfaces; 6. Arithmetic applications.
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