# Topological methods for variational problems with symmetries / Thomas Bartsch.

##### By: Bartsch, Thomas

Material type: TextSeries: Lecture notes in mathematics (Springer-Verlag): 1560.Publisher: Berlin ; New York : Springer-Verlag, ©1993Description: 1 online resource (x, 152 pages) : illustrationsContent type: text Media type: computer Carrier type: online resourceISBN: 9783540480990; 3540480994Subject(s): Critical point theory (Mathematical analysis) | Symmetry groups | Calculus of variations | Points critiques, Théorie des (Analyse mathématique) | Groupes symétriques | Calcul des variations | Calculus of variations | Critical point theory (Mathematical analysis) | Symmetry groups | Globale analyse | Algebraïsche topologie | Point critique | Groupes, Théorie des -- Symétriques | Calcul des variationsGenre/Form: Electronic books. Additional physical formats: Print version:: Topological methods for variational problems with symmetries.DDC classification: 510 s | 514/.74 LOC classification: QA3 | .L28 no. 1560Other classification: 31.55 | 31.61 Online resources: Click here to access onlineItem type | Current location | Collection | Call number | Status | Date due | Barcode | Item holds |
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Includes bibliographical references (pages 142-149) and index.

Symmetry has a strong impact on the number and shape of solutions to variational problems. This has been observed, for instance, in the search for periodic solutions of Hamiltonian systems or of the nonlinear wave equation; when one is interested in elliptic equations on symmetric domains or in the corresponding semiflows; and when one is looking for "special" solutions of these problems. This book is concerned with Lusternik-Schnirelmann theory and Morse-Conley theory for group invariant functionals. These topological methods are developed in detail with new calculations of the equivariant Lusternik-Schnirelmann category and versions of the Borsuk-Ulam theorem for very general classes of symmetry groups. The Morse-Conley theory is applied to bifurcation problems, in particular to the bifurcation of steady states and hetero-clinic orbits of O(3)-symmetric flows; and to the existence of periodic solutions nearequilibria of symmetric Hamiltonian systems. Some familiarity with the usualminimax theory and basic algebraic topology is assumed.

Print version record.

Category, genus and critical point theory with symmetries -- Category and genus of infinite-dimensional representation spheres -- The length of G-spaces -- The length of representation spheres -- The length and Conley index theory -- The exit-length -- Bifurcation for O(3)-equivariant problems -- Multiple periodic solutions near equilibria of symmetric Hamiltonian systems.

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