The solution of a Fučík's conjecture
The Strong Rigidity of Locally Symmetric Complex Manifolds of Rank One and Finite Volume.
The structure and limiting behavior of locally optimal minimizers
The structure of the critical set in the general mountain pass principle
The structure of the cut locus in dimension less than or equal to six
The symmetry of minimizing harmonic maps from a two dimensional domain to the sphere
The total divergence equation.
The Tzitzeica surface as solution of PDE systems.
The uniqueness for minimal surfaces in S3.
The use of Cerami sequences in critical point theory.
The Weak Solutions to the Evolution Problems of Harmonic Maps.
The Weinstein Conjecture in P X Cl.
Théorie de Morse (d'après E. Witten)
Theory of coverings in the study of Riemann surfaces
For a G-covering Y → Y/G = X induced by a properly discontinuous action of a group G on a topological space Y, there is a natural action of π(X,x) on the set F of points in Y with nontrivial stabilizers in G. We study the covering of X obtained from the universal covering of X and the left action of π(X,x) on F. We find a formula for the number of fixed points of an element g ∈ G which is a generalization of Macbeath's formula applied to an automorphism of a Riemann surface. We give a new method...
Three nodal solutions of singularly perturbed elliptic equations on domains without topology
Three periodic solutions for an ordinary differential inclusion with two parameters
Applying a nonsmooth version of a three critical points theorem of Ricceri, we prove the existence of three periodic solutions for an ordinary differential inclusion depending on two parameters.
Three solutions for a nonlinear Neumann boundary value problem
The aim of this paper is to establish the existence of at least three solutions for the nonlinear Neumann boundary-value problem involving the p(x)-Laplacian of the form in Ω, on ∂Ω. Our technical approach is based on the three critical points theorem due to Ricceri.
Three solutions for forced Duffing-type equations with damping term.
Three solutions of a quasilinear elliptic problem near resonance
Timelike trajectories with fixed energy under a potential in static spacetimes.