Critical point theory for perturbations of symmetric functionals.
Critical point theory with symmetries.
Critical points at infinity in the variational calculus
Critical points of asymptotically quadratic functions
Existence results for critical points of asymptotically quadratic functions defined on Hilbert spaces are studied by using Morse-Conley index and pseudomonotone mappings. Applications to differential equations are given.
Critical points of solutions of elliptic equations in two variables
Critical sets in 3-space
Critical sets of 2-dimensional compact manifolds.