Ultrafilters Throughout Mathematics

Author : Isaac Goldbring
Publisher : American Mathematical Society
ISBN 13 : 1470469006
Total Pages : 399 pages
Book Rating : 4.09/5 ( download)

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Download or read book Ultrafilters Throughout Mathematics written by Isaac Goldbring and published by American Mathematical Society. This book was released on 2022-06-13 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrafilters and ultraproducts provide a useful generalization of the ordinary limit processes which have applications to many areas of mathematics. Typically, this topic is presented to students in specialized courses such as logic, functional analysis, or geometric group theory. In this book, the basic facts about ultrafilters and ultraproducts are presented to readers with no prior knowledge of the subject and then these techniques are applied to a wide variety of topics. The first part of the book deals solely with ultrafilters and presents applications to voting theory, combinatorics, and topology, while also dealing also with foundational issues. The second part presents the classical ultraproduct construction and provides applications to algebra, number theory, and nonstandard analysis. The third part discusses a metric generalization of the ultraproduct construction and gives example applications to geometric group theory and functional analysis. The final section returns to more advanced topics of a more foundational nature. The book should be of interest to undergraduates, graduate students, and researchers from all areas of mathematics interested in learning how ultrafilters and ultraproducts can be applied to their specialty.

Author : Vitaly Bergelson
Publisher : American Mathematical Soc.
ISBN 13 : 082184833X
Total Pages : 214 pages
Book Rating : 4.33/5 ( download)

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Download or read book Ultrafilters across Mathematics written by Vitaly Bergelson and published by American Mathematical Soc.. This book was released on 2010 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the state-of-the-art of applications in the whole spectrum of mathematics which are grounded on the use of ultrafilters and ultraproducts. It contains two general surveys on ultrafilters in set theory and on the ultraproduct construction, as well as papers that cover additive and combinatorial number theory, nonstandard methods and stochastic differential equations, measure theory, dynamics, Ramsey theory, algebra in the space of ultrafilters, and large cardinals.

Author : W.W. Comfort
Publisher : Springer Science & Business Media
ISBN 13 : 364265780X
Total Pages : 494 pages
Book Rating : 4.01/5 ( download)

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Download or read book The Theory of Ultrafilters written by W.W. Comfort and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: An ultrafilter is a truth-value assignment to the family of subsets of a set, and a method of convergence to infinity. From the first (logical) property arises its connection with two-valued logic and model theory; from the second (convergence) property arises its connection with topology and set theory. Both these descriptions of an ultrafilter are connected with compactness. The model-theoretic property finds its expression in the construction of the ultraproduct and the compactness type of theorem of Los (implying the compactness theorem of first-order logic); and the convergence property leads to the process of completion by the adjunction of an ideal element for every ultrafilter-i. e. , to the Stone-Cech com pactification process (implying the Tychonoff theorem on the compact ness of products). Since these are two ways of describing the same mathematical object, it is reasonable to expect that a study of ultrafilters from these points of view will yield results and methods which can be fruitfully crossbred. This unifying aspect is indeed what we have attempted to emphasize in the present work.

Author : Yevhen Zelenyuk
Publisher : Walter de Gruyter
ISBN 13 : 3110213222
Total Pages : 229 pages
Book Rating : 4.25/5 ( download)

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Download or read book Ultrafilters and Topologies on Groups written by Yevhen Zelenyuk and published by Walter de Gruyter. This book was released on 2011-03-29 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the relationship between ultrafilters and topologies on groups. It shows how ultrafilters are used in constructing topologies on groups with extremal properties and how topologies on groups serve in deriving algebraic results about ultrafilters. The contents of the book fall naturally into three parts. The first, comprising Chapters 1 through 5, introduces to topological groups and ultrafilters insofar as the semigroup operation on ultrafilters is not required. Constructions of some important topological groups are given. In particular, that of an extremally disconnected topological group based on a Ramsey ultrafilter. Also one shows that every infinite group admits a nondiscrete zero-dimensional topology in which all translations and the inversion are continuous. In the second part, Chapters 6 through 9, the Stone-Cêch compactification βG of a discrete group G is studied. For this, a special technique based on the concepts of a local left group and a local homomorphism is developed. One proves that if G is a countable torsion free group, then βG contains no nontrivial finite groups. Also the ideal structure of βG is investigated. In particular, one shows that for every infinite Abelian group G, βG contains 22|G| minimal right ideals. In the third part, using the semigroup βG, almost maximal topological and left topological groups are constructed and their ultrafilter semigroups are examined. Projectives in the category of finite semigroups are characterized. Also one shows that every infinite Abelian group with finitely many elements of order 2 is absolutely ω-resolvable, and consequently, can be partitioned into ω subsets such that every coset modulo infinite subgroup meets each subset of the partition. The book concludes with a list of open problems in the field. Some familiarity with set theory, algebra and topology is presupposed. But in general, the book is almost self-contained. It is aimed at graduate students and researchers working in topological algebra and adjacent areas.

Author : Nathanial Patrick Brown
Publisher : American Mathematical Soc.
ISBN 13 : 0821843818
Total Pages : 530 pages
Book Rating : 4.19/5 ( download)

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Download or read book $\textrm {C}^*$-Algebras and Finite-Dimensional Approximations written by Nathanial Patrick Brown and published by American Mathematical Soc.. This book was released on 2008 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: $\textrm{C}*$-approximation theory has provided the foundation for many of the most important conceptual breakthroughs and applications of operator algebras. This book systematically studies (most of) the numerous types of approximation properties that have been important in recent years: nuclearity, exactness, quasidiagonality, local reflexivity, and others. Moreover, it contains user-friendly proofs, insofar as that is possible, of many fundamental results that were previously quite hard to extract from the literature. Indeed, perhaps the most important novelty of the first ten chapters is an earnest attempt to explain some fundamental, but difficult and technical, results as painlessly as possible. The latter half of the book presents related topics and applications--written with researchers and advanced, well-trained students in mind. The authors have tried to meet the needs both of students wishing to learn the basics of an important area of research as well as researchers who desire a fairly comprehensive reference for the theory and applications of $\textrm{C}*$-approximation theory.

Author : A. B. Slomson
Publisher : Dover Publications
ISBN 13 : 9780486788630
Total Pages : 336 pages
Book Rating : 4.36/5 ( download)

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Download or read book Models and Ultraproducts written by A. B. Slomson and published by Dover Publications. This book was released on 2013-12-20 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first-year graduate text assumes only an acquaintance with set theory to explore homogeneous universal models, saturated structure, extensions of classical first-order logic, and other topics. 1974 edition.

Author : Stephen George Simpson
Publisher : American Mathematical Soc.
ISBN 13 : 0821850520
Total Pages : 408 pages
Book Rating : 4.27/5 ( download)

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Download or read book Logic and Combinatorics written by Stephen George Simpson and published by American Mathematical Soc.. This book was released on 1987 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Mauro Di Nasso
Publisher : Springer
ISBN 13 : 3030179567
Total Pages : 206 pages
Book Rating : 4.64/5 ( download)

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Download or read book Nonstandard Methods in Ramsey Theory and Combinatorial Number Theory written by Mauro Di Nasso and published by Springer. This book was released on 2019-05-23 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this monograph is to give an accessible introduction to nonstandard methods and their applications, with an emphasis on combinatorics and Ramsey theory. It includes both new nonstandard proofs of classical results and recent developments initially obtained in the nonstandard setting. This makes it the first combinatorics-focused account of nonstandard methods to be aimed at a general (graduate-level) mathematical audience. This book will provide a natural starting point for researchers interested in approaching the rapidly growing literature on combinatorial results obtained via nonstandard methods. The primary audience consists of graduate students and specialists in logic and combinatorics who wish to pursue research at the interface between these areas.

Author : Steven A. Gaal
Publisher : Courier Corporation
ISBN 13 : 0486472221
Total Pages : 338 pages
Book Rating : 4.25/5 ( download)

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Download or read book Point Set Topology written by Steven A. Gaal and published by Courier Corporation. This book was released on 2009-04-23 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: Suitable for a complete course in topology, this text also functions as a self-contained treatment for independent study. Additional enrichment materials make it equally valuable as a reference. 1964 edition.

Author : Mahmoud Filali
Publisher :
ISBN 13 : 9789668849145
Total Pages : 258 pages
Book Rating : 4.40/5 ( download)

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Download or read book Ultrafilters and Topologies on Groups written by Mahmoud Filali and published by . This book was released on 2010 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: