Critical point theory for perturbations of symmetric functionals.
Critical point theory with symmetries.
Lusternik-Schnirelmann category and minimal coverings with contractible sets.
The Homotopy Categorie of Parametrized Spectra.
The compact category and mulitple periodic solutions of Hamiltionian systems on symmetric starshaped energy surfaces.
Bifurcation Theory for Symmetric Potential Operators and the Equvariant Cup-length.
Singular limits for the bi-laplacian operator with exponential nonlinearity in
Strongly indefinite functionals with perturbed symmetries and multiple solutions of nonsymmetric elliptic systems.
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