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The Theory of Ultrafilters
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Catalogue Information
Field name
Details
Dewey Class
514
Title
The Theory of Ultrafilters ([EBook]) / by W. Wistar Comfort, Stylianos Negrepontis.
Author
Comfort, W. W. (William Wistar) , 1933-
Added Personal Name
Negrepontis, Stylianos
Other name(s)
SpringerLink (Online service)
Publication
Berlin, Heidelberg : Springer , 1974.
Physical Details
X, 484 pages : online resource.
Series
Die Grundlehren der mathematischen Wissenschaften in Einzeldarstellungen mit besonderer Berücksichtigung der Anwendungsgebiete
0072-7830 ; ; 211
ISBN
9783642657801
Summary Note
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.:
Contents note
§1. Set Theory -- Ordinals -- Cardinal Arithmetic -- Notes for §1 -- § 2. Topology and Boolean Algebras -- Topology -- Finitary Properties of Boolean Algebras -- Stone’s Duality -- The Completion of a Boolean Algebra and the Gleason Space of a Compact Space -- Notes for §2 -- §3. Intersection Systems and Families of Large Oscillation -- Intersection Systems and the Souslin Number -- Families of Large Oscillation -- Notes for §3 -- § 4. The General Theory of Jönsson Classes -- Notes for §4 -- §5. The Jónsson Class of Ordered Sets -- Notes for §5 -- § 6. The Jónsson Class of Boolean Algebras -- The Stone Space of the Homogeneous-Universal Boolean Algebras -- Properties of the Space S? -- Notes for §6 -- § 7. Basic Facts on Ultrafilters -- Notes for §7 -- §8. Large Cardinals -- Weakly Compact Cardinals: Combinatorial Equivalences -- Weakly Compact Cardinals: Boolean-Algebraic and Topological Equivalences -- Measurable Cardinals -- Descendingly Incomplete Ultrafilters -- Notes for §8 -- § 9. The Rudin-Keisler Order on Types of Ultrafilters -- The Rudin-Keisler Order -- Rudin-Keisler Minimal Types in ?[?(?)\?] -- Good Ultrafilters -- Notes for §9. -- § 10. Good Ultrafilters -- Families of Large Oscillation Modulo Filters; the Fundamental Existence Theorem of Good Ultrafilters -- Additional Existence Results -- Directedness Properties of the Rudin-Keisler Order -- Adequate Ultrafilters on Special Boolean Algebras -- Notes for §10 -- § 11. Elementary Types -- Notes for §11 -- § 12. Families of Almost Disjoint Sets -- Cardinalities of Families of Almost Disjoint Sets -- The Balcar-Vop?nka Theorem -- Cardinalities of Ultraproducts -- Notes for § 12 -- §13. Saturation of Ultraproducts -- Ultraproducts Modulo Regular Ultrafilters -- Ultraproducts Modulo Good Ultrafilters -- Shelah’s Characterisation of Elementary Equivalence -- Characterisation of the Rudin-Keisler Order -- Notes for §13 -- § 14. Topology of Spaces of Ultrafilters -- Certain Properties of F?-Spaces -- The Space of ?-Uniform Ultrafilters on ? -- Spaces of Uniform Ultrafilters and Homogeneous-Universal Boolean Algebras -- The Space of Sub-Uniform Ultrafilters -- Relations to Measurable Cardinals -- Notes for §14 -- §15. Spaces Homeomorphic to (2?)? -- The Topological Characterization of (2?)? -- The Baire Category Properties of (2?)? -- Spaces of Ultrafilters Homeomorphic to Spaces (2?)? -- Applications to the Growth Spaces ?X\X -- Notes for §15 -- § 16. Ultrafilters on ? -- The Rudin-Keisler Order on ?(?) and the Canonical Function ?:?(? × ?) ? ?(?) × ?(?) -- The Rudin-Frolík Order -- Non-Homogeneity of Certain Spaces -- Notes for §16 -- Index of Symbols.
System details note
Online access to this digital book is restricted to subscription institutions through IP address (only for SISSA internal users)
Internet Site
http://dx.doi.org/10.1007/978-3-642-65780-1
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Subject References:
Mathematics
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Topology
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Authors:
author
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Comfort, W. W. (William Wistar) 1933-
.
Comfort, W. W. (William Wistar) 1933-
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Negrepontis, Stylianos
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Corporate Authors:
SpringerLink (Online service)
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Series:
Die Grundlehren der mathematischen Wissenschaften in Einzeldarstellungen mit besonderer Berücksichtigung der Anwendungsgebiete
.
Classification:
514
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