Contents
Prefaee vi i
1. An Overview 1
2. The Mountain Pass Theorem and Some Applications 9
3. Some Variants of the Mountain Pass Theorem 2 1
4. The Saddle Point Theorem 2 5
5. Some Generalizations of the Mountain Pass Theorem 3 0
6. Applications to Hamiltonian Systems 3 7
7. Functionals with Symmetries and Index Theories 4 7
8. Multiple Critical Points of Symmetrie Functionals:
Problems with Constraints 5 0
9. Multiple Critical Points of Symmetrie Functionals:
The Unconstrained Cas e 5 5
10. Perturbations from Symmetry 6 3
11. Variational Methods in Bifurcation Theor y 7 2
Appendix A 8 3
Appendix B 9
References 9 8
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