Hans Grauert – författare

The aim of this book is to give an understandable introduction to the the­ ory of complex manifolds. With very few exceptions we give complete proofs. Many examples and figures along with quite a few exercises are included. Our intent is to familiarize the reader with the most important branches and methods in complex analysis of several variables and to do this as simply as possible. Therefore, the abstract concepts involved with sheaves, coherence, and higher-dimensional cohomology are avoided. Only elementary methods such as power series, holomorphic vector bundles, and one-dimensional co­ cycles are used. Nevertheless, deep results can be proved, for example the Remmert-Stein theorem for analytic sets, finiteness theorems for spaces of cross sections in holomorphic vector bundles, and the solution of the Levi problem. The first chapter deals with holomorphic functions defined in open sub­ sets of the space en. Many of the well-known properties of holomorphic functions of one variable, such as the Cauchy integral formula or the maxi­ mum principle, can be applied directly to obtain corresponding properties of holomorphic functions of several variables. Furthermore, certain properties of differentiable functions of several variables, such as the implicit and inverse function theorems, extend easily to holomorphic functions.

The aim of this book is to give an understandable introduction to the the­ ory of complex manifolds. With very few exceptions we give complete proofs. Many examples and figures along with quite a few exercises are included. Our intent is to familiarize the reader with the most important branches and methods in complex analysis of several variables and to do this as simply as possible. Therefore, the abstract concepts involved with sheaves, coherence, and higher-dimensional cohomology are avoided. Only elementary methods such as power series, holomorphic vector bundles, and one-dimensional co­ cycles are used. Nevertheless, deep results can be proved, for example the Remmert-Stein theorem for analytic sets, finiteness theorems for spaces of cross sections in holomorphic vector bundles, and the solution of the Levi problem. The first chapter deals with holomorphic functions defined in open sub­ sets of the space en. Many of the well-known properties of holomorphic functions of one variable, such as the Cauchy integral formula or the maxi­ mum principle, can be applied directly to obtain corresponding properties of holomorphic functions of several variables. Furthermore, certain properties of differentiable functions of several variables, such as the implicit and inverse function theorems, extend easily to holomorphic functions.

From the reviews:"Theory of Stein Spaces provides a rich variety of methods, results, and motivations - a book with masterful mathematical care and judgement. It is a pleasure to have this fundamental material now readily accessible to any serious mathematician."J. Eells in Bulletin of the London Mathematical Society (1980)"Written by two mathematicians who played a crucial role in the development of the modern theory of several complex variables, this is an important book."J.B. Cooper in Internationale Mathematische Nachrichten (1979)

Das vorliegende Brich über Funktionen einer reellen Veränderlichen ist der erste Teil einer dreibändigen Darstellung der Differential- und Integralrechnung. In den folgenden Bänden sollen Funktionen mehrerer Veränderlichen, gewöhnliche Differentialgleichungen und Integrations­ theorie behandelt werden. Das Werk ist aus Vorlesungen für Studienanfänger der Mathematik und Physik hervorgegangen. Dem einführenden Charakter dieser Vor­ lesungen gemäß soll auch das Buch einem Leser, der keine Vorkenntnisse in höherer Mathematik besitzt, die Gelegenheit geben, einen möglichst strengen und systematischen Aufbau der Theorie der reellen Funktionen kennen zu lernen. Dementsprechend sind alle Beweise bis in die Einzel­ heiten hinein ausgeführt, und in den ersten Paragraphen werden wich­ tige Beweismethoden eigens erläutert. Dabei nehmen wir jedoch den logischen und mengentheoretischen Gesetzen gegenüber einen "naiven", d. h. nicht-axiomatischen, Standpunkt ein. Das gilt besonders für das Prinzip der vollständigen Induktion und damit auch für den Begriff der natürlichen Zahl und der Folge. Wir geben eine Übersicht über den Inhalt des Buches. Grundlegend ist der Begriff der reellen Zahl. Im ersten Kapitel werden die Axiome des reellen Zahlkörpers mit ihren einfachsten Folge­ rungen ausführlich besprochen; die unendlich fernen Punkte + oo und - oo werden axiomatisch miteingeführt. Die nächsten beiden Kapitel sind dem Umgebungsbegriff und dem darauf fußenden Grenzwertbegriff für Folgen und Reihen gewidmet. Da wir für die Definition der Konvergenz die natürliche (uniforme) Topologie der Zahlengeraden zugrundelegen, bleibt die Konvergenz gegen ± oo ausgeschlossen. -Die Begriffe "Iimes superior" und "Iimes inferior" sind so gefaßt, daß sie mit der Definition der halbstetigen Funktionen harmonieren.

Hans Grauert was one of the world's leading mathematicians in the field of Several Complex Variables; he not only shaped the development of this area decisively but was also responsible for some of its most important results. This representative selection of mathematical papers exhibits Grauert's influential research and reflects two decades of excellence. In this edition, each paper has been augmented by a detailed commentary, thus offering a comprehensive survey of the development of this fascinating subject from its beginnings in Münster and Göttingen. Hans Grauert may be regarded as a direct successor of Gauss, holding a chair at Göttingen that before him was held by Siegel, Weyl, Hilbert, Riemann and Gauss.