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Mathematics - Geometry & Topology | General Topology II - Compactness, Homologies of General Spaces

General Topology II

Compactness, Homologies of General Spaces

Arhangel'skii, A.V. (Ed.)

Translated by Lysko, J.M.

Original Russian edition published by VINITI Moscow, 1989

Softcover reprint of the original 1st ed. 1996, VII, 256 pp.

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  • About this book

This volume of the Encyclopaedia consists of two independent parts. The first contains a survey of results related to the concept of compactness in general topology. It highlights the role that compactness plays in many areas of general topology. The second part is devoted to homology and cohomology theories of general spaces. Special emphasis is placed on the method of sheaf theory as a unified approach to constructions of such theories. Both authors have succeeded in presenting a wealth of material that is of interest to students and researchers in the area of topology. Each part illustrates deep connections between important mathematical concepts. Both parts reflect a certain new way of looking at well known facts by establishing interesting relationships between specialized results belonging to diverse areas of mathematics.

Content Level » Research

Keywords » Algebraic structure - Boolean algebra - Compact space - Kohomologie - Separation axiom - cardinal invariant - cohomology - cohomology theory - fixed-point theorem - general topology - homology - kompakte Räume - sheaf theory - topological group - topology

Related subjects » Algebra - Geometry & Topology

Table of contents 

§1. Compactness and Its Different Forms: Separation Axioms.- 1.1. Different Definitions of Compactness.- 1.2. Relative Compactness.- 1.3. Countable Compactness.- 1.4. Relative Countable Compactness.- 1.5. Pseudocompact Spaces.- 1.6. Separation Axioms and Properties Related to Compactness.- 1.7. Star Characterizations of Countable Compactness and Pseudocompactness.- §2. Compactness and Products.- 2.1. Tikhonov’s Theorem on Compactness of the Product.- 2.2. Products of Countably Compact Spaces.- 2.3. Products of Pseudocompact Spaces.- 2.4. Total Countable Compactness and Total Pseudocompactness.- 2.5. Compactness with Respect to a Fixed Ultrafilter (?-Compactness).- 2.6. ?-Products of Compact Spaces.- §3. Continuous Mappings of Compact Spaces.- 3.1. Theorem on Compactness of the Image and Its Consequences.- 3.2. Continuous Images of “Standard” Compacta.- 3.3. Open Mappings of Compacta and Dimension.- 3.4. Mardeši?’s Factorization Theorem.- 3.5. Continuous Images of Ordered Compacta.- 3.6. Pseudocompactness and Continuous Mappings.- 3.7. Continuous Mappings and Extremally Disconnected Compacta.- 3.8. Scattered Compacta and Their Images.- §4. Metrizability Conditions for Compact, Countably Compact and Pseudocompact Spaces.- 4.1. Classical Results and the Theorem of Chaber.- 4.2. Theorems of Dow and Tkachenko.- 4.3. Point-countable and ?-Point-finite Bases.- 4.4. Quasi-developments and ??-Bases.- 4.5. Strongly N0-Noetherian Bases.- 4.6. Rank of a Base and Metrizability Conditions for Compacta.- 4.7. Symmetrics and Metrizability of Compacta.- §5. Cardinal Invariants in the Class of Compacta.- 5.1. Network Weight, Diagonal Number and Weight of Compacta.- 5.2. Pseudocharacter and Character in the Class of Compacta.- 5.3. First Countable Compacta.- 5.4. Perfectly Normal Compacta.- 5.5. Continuous Images of First Countable Compacta.- 5.6. Sequential Compacta and the First Axiom of Countability Almost Everywhere.- 5.7. Corson Compact Spaces and N0-Monolithicity.- 5.8. Compacta of Countable Tightness.- 5.9. Mappings of Compacta onto Tikhonov Cubes I?.- 5.10. Dyadic Compacta.- 5.11. Supercompacta and Extensions of the Class of Dyadic Compacta.- §6. Compact Extensions.- 6.1. General Remarks about Compact Extensions.- 6.2. Compact T1-Extensions.- 6.3. Embedding Topological Spaces into Compact T1-Spaces of Countable Weight.- 6.4. Compact Hausdorff Extensions, Relation of Subordination.- 6.5. Compact Extensions of Locally Compact Hausdorff Spaces.- 6.6. Duality Between Properties of a Space and of Its Remainder.- 6.7. Compact Extensions and Cardinal Invariants.- 6.8. Compact Hausdorff Extensions and Perfect Mappings.- 6.9. Properties of the ?ech-Stone Extension.- 6.10. Closing Remarks Concerning Compact Hausdorff Extensions.- §7. Compactness and Spaces of Functions.- 7.1. Natural Topologies on Spaces of Functions.- 7.2. Joint Continuity and Compact-Open Topology.- 7.3. Stone-Weierstrass Theorem.- 7.4. Convex Compact Sets and Krein-Milman Theorem.- 7.5. Theorem of Alaoglu and Convex Hulls of Compacta.- 7.6. Fixed-Point Theorems for Continuous Mappings of Convex Compacta.- 7.7. Milyutin Compact Spaces.- 7.8. Dugundji Compact Spaces.- §8. Algebraic Structures and Compactness — A Review of the Most Important Results.- 8.1. Compacta and Ideals in Rings of Functions.- 8.2. Spectrum of a Ring. Zariski Topology.- 8.3. The Space of Maximal Ideals of a Commutative Banach Algebra.- 8.4. The Stone Space of a Boolean Algebra.- 8.5. Pontryagin’s Duality Theory.- 8.6. Compact Extensions of Topological Groups. Almost Periodic Functions.- 8.7. Compacta and Namioka’s Theorem About Joint Continuity of Separately Continuous Functions.- 8.8. Fragmentable and Strongly Fragmentable Compacta and Radon-Nikodým Compact Spaces.- 8.9. Hilbert Modules over C*-Algebras of Continuous Functions on Compacta.- 8.10. Compact Subsets of Topological Fields.- 8.11. Locally Compact Topological Groups and Paracompactness.- 8.12. Final Remarks.- References.

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