Saddle-Point and Linking Theorems
In this chapter we extend the minimax characterizations of critical points of functionals considering saddle-point theorems. First we present an earlier version of a saddle-point theorem of Von Neumann [Neu] and some generalizations. The goal of this chapter is to present the saddle-point theorem of P. Rabinowitz and some extensions obtained by several authors.
KeywordsReal Banach Space Critical Point Theory Minimax Theorem Nonlinear Functional Analysis Deformation Type
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