Preface
1．An Overview
2．The Mountain Pass Theorem and Some Applications
3．Some Variants of the Mountain Pass Theorem
4．The Saddle Point Theorem
5．Some Generalizations of the Mountain Pass Theorem
6．Applications to Hamiltonian Systems
7．Functionals with Symmetries and Index Theories
8．Multiple Critical Points of Symmetric Functionals： Problems with Constraints
9．Multiple Critical Points of Symmetric Functionals： The Unconstrained Case
10．Perturbations from Symmetry
11．Variational Methods in Bifurcation Theory
Appendix A
Appendix B
References
