Gerhard Preuß – författare

A new foundation of Topology, summarized under the name Convenient Topology, is considered such that several deficiencies of topological and uniform spaces are remedied. This does not mean that these spaces are superfluous. It means exactly that a better framework for handling problems of a topological nature is used. In this setting semiuniform convergence spaces play an essential role. They include not only convergence structures such as topological structures and limit space structures, but also uniform convergence structures such as uniform structures and uniform limit space structures, and they are suitable for studying continuity, Cauchy continuity and uniform continuity as well as convergence structures in function spaces, e.g. simple convergence, continuous convergence and uniform convergence. Various interesting results are presented which cannot be obtained by using topological or uniform spaces in the usual context. The text is self-contained with the exception of the last chapter, where the intuitive concept of nearness is incorporated in Convenient Topology (there exist already excellent expositions on nearness spaces).

Der vorliegende Band II enthält Hausdorffs wohl wichtigstes Werk, die "Grundzüge der Mengenlehre" Dieses Buch gehört zu den Klassikern der mathematischen Literatur und hat auf die Entwicklung der Mathematik im 20. Jahrhundert einen bedeutenden Einfluß ausgeübt. Daher erschien es geboten, ausführliche Kommentare beizufügen. In diesen Kommentaren werden vor allem die bedeutenden originellen Beiträge, die Hausdorff in den "Grundzügen" zur Topologie, allgemeinen und deskriptiven Mengenlehre geleistet hat, eingehend behandelt. Insbesondere wird versucht, Hausdorffs Leistungen in die historische Entwicklung einzuordnen und ihre jeweilige Wirkungsgeschichte zu skizzieren.

This volume contains selected papers of the International Workshop on "Categorical Methods in Computer Science - with Aspects from Topology" and of the "6th International Data Type Workshop" held in August/September 1988 in Berlin. The 23 papers of this volume are grouped into three parts: Part 1 includes papers on categorical foundations and fundamental concepts from category theory in computer science. Part 2 presents applications of categorical methods to algebraic specification languages and techniques, data types, data bases, programming, and process specifications. Part 3 comprises papers on categorial aspects from topology which mainly concentrate on special adjoint situations like cartesian closeness, Galois connections, reflections, and coreflections which are of growing interest in categorical topology and computer science.

Band III der Hausdorff-Edition enthält Hausdorffs Band „Mengenlehre", seine veröffentlichten Arbeiten zur deskriptiven Mengenlehre und Topologie sowie zahlreiche einschlägige Studien aus dem Nachlaß. Sein Buch „Mengenlehre" erlangte besonders dadurch historische Bedeutung, als darin erstmals eine monographische Darstellung des damals aktuellen Standes der deskriptiven Mengenlehre gegeben wurde. Es ist hier von Spezialisten dieses Gebietes sorgfältig kommentiert worden. Auch die veröffentlichten Arbeiten sind mit ausführlichen Kommentaren versehen. Besonders umfassend ist in diesem Band der Edition der Nachlaß Hausdorffs berücksichtigt. Hingewiesen sei insbesondere auf seinen zahlreichen originellen Studien zu Themen der deskriptiven Mengenlehre und auf seine damals sehr originelle Vorlesung über algebraische Topologie vom Sommersemester 1933.

Der vorliegende Band II enthält Hausdorffs wohl wichtigstes Werk, die "Grundzüge der Mengenlehre" Dieses Buch gehört zu den Klassikern der mathematischen Literatur und hat auf die Entwicklung der Mathematik im 20. Jahrhundert einen bedeutenden Einfluß ausgeübt. Daher erschien es geboten, ausführliche Kommentare beizufügen. In diesen Kommentaren werden vor allem die bedeutenden originellen Beiträge, die Hausdorff in den "Grundzügen" zur Topologie, allgemeinen und deskriptiven Mengenlehre geleistet hat, eingehend behandelt. Insbesondere wird versucht, Hausdorffs Leistungen in die historische Entwicklung einzuordnen und ihre jeweilige Wirkungsgeschichte zu skizzieren.

Approach your problems from the right end It isn't that they can't see the solution. It is and begin with the answers. Then one day, that they can't see the problem. perhaps you will find the final question. G. K. Chesterton. The Scandal of Father 'The Hermit Clad in Crane Feathers' in R. Brown 'The point of a Pin'. van Gulik's The Chinese Maze Murders. Growing specialization and diversification have brought a host of monographs and textbooks on increasingly specialized topics. However, the "tree" of knowledge of mathematics and related fields does not grow only by putting forth new branches. It also happens, quite often in fact, that branches which were thought to be completely disparate are suddenly seen to be related. Further, the kind and level of sophistication of mathematics applied in various sciences has changed drastically in recent years: measure theory is used (non-trivially) in regional and theoretical economics; algebraic geometry interacts with physics; the Minkowsky lemma, coding theory and the structure of water meet one another in packing and covering theory; quantum fields, crystal defects and mathematical programming profit from homotopy theory; Lie algebras are relevant to filtering; and prediction and electrical engineering can use Stein spaces. And in addition to this there are such new emerging subdisciplines as "experimental mathematics", "CFD", "completely integrable systems", "chaos, synergetics and large-scale order", which are almost impossible to fit into the existing classification schemes. They draw upon widely different sections of mathematics.

A new foundation of Topology, summarized under the name Convenient Topology, is considered such that several deficiencies of topological and uniform spaces are remedied. This does not mean that these spaces are superfluous. It means exactly that a better framework for handling problems of a topological nature is used. In this setting semiuniform convergence spaces play an essential role. They include not only convergence structures such as topological structures and limit space structures, but also uniform convergence structures such as uniform structures and uniform limit space structures, and they are suitable for studying continuity, Cauchy continuity and uniform continuity as well as convergence structures in function spaces, e.g. simple convergence, continuous convergence and uniform convergence. Various interesting results are presented which cannot be obtained by using topological or uniform spaces in the usual context. The text is self-contained with the exception of the last chapter, where the intuitive concept of nearness is incorporated in Convenient Topology (there exist already excellent expositions on nearness spaces).