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Introductory lectures on equivariant cohomology (with appendices by Loring W. Tu and Alberto Arabia)

Introductory lectures on equivariant cohomology (with appendices by Loring W. Tu and Alberto Arabia)
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Dewey Class 514.23
Title Introductory lectures on equivariant cohomology : (with appendices by Loring W. Tu and Alberto Arabia) (M) / Loring W. Tu
Author Tu, Loring W.
Publication Princeton : Princeton University Press , 2020
Physical Details xx, 315 pages : ill ; 24 cm.
Series Annals of mathematics studies ; 204
ISBN 9780691191751
Summary Note "This book gives a clear introductory account of equivariant cohomology, a central topic in algebraic topology. Equivariant cohomology is concerned with the algebraic topology of spaces with a group action, or in other words, with symmetries of spaces. First defined in the 1950s, it has been introduced into K-theory and algebraic geometry, but it is in algebraic topology that the concepts are the most transparent and the proofs are the simplest. One of the most useful applications of equivariant cohomology is the equivariant localization theorem of Atiyah-Bott and Berline-Vergne, which converts the integral of an equivariant differential form into a finite sum over the fixed point set of the group action, providing a powerful tool for computing integrals over a manifold. Because integrals and symmetries are ubiquitous, equivariant cohomology has found applications in diverse areas of mathematics and physics. Assuming readers have taken one semester of manifold theory and a year of algebraic topology, Loring Tu begins with the topological construction of equivariant cohomology, then develops the theory for smooth manifolds with the aid of differential forms. To keep the exposition simple, the equivariant localization theorem is proven only for a circle action. An appendix gives a proof of the equivariant de Rham theorem, demonstrating that equivariant cohomology can be computed using equivariant differential forms. Examples and calculations illustrate new concepts. Exercises include hints or solutions, making this book suitable for self-study"-- Provided by publisher.:
Contents note Homotopy groups and CW complexes -- Principal bundles -- Homotopy quotients and equivariant cohomology -- Universal bundles and classifying spaces -- Spectral sequences -- Equivariant cohomology of S² under rotation -- A universal bundle for a compact lie group -- General properties of equivariant cohomology -- The lie derivative and interior multiplication -- Fundamental vector fields -- Basic forms -- Integration on a compact connected lie group -- Vector-valued forms -- The Maurer-Cartan form -- Connections on a principal bundle -- Curvature on a principal bundle -- Differential graded algebras -- The Weil algebra and the weil model -- Circle actions -- The cartan model in general -- Outline of a proof of the equivariant de Rham theorem -- Localization in algebra -- Free and locally free actions -- The topology of a group action -- Borel localization for a circle action -- A crash course in representation theory -- Integration of equivariant forms -- Rationale for a localization formula -- Localization formulas -- Proof of the localization formula for a circle action -- Some applications.
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0000000044437 515.14 TU
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