On the existence of Jenkins-Strebel differentials using harmonic maps from surfaces to graphs.
On the existence of multiple geodesics in static space-times
On the existence of multiple solutions for a nonlocal BVP with vector-valued response
The existence of positive solutions for a nonlocal boundary-value problem with vector-valued response is investigated. We develop duality and variational principles for this problem. Our variational approach enables us to approximate solutions and give a measure of a duality gap between the primal and dual functional for minimizing sequences.
On the Existence of Optimal Solutions for Infinite Horizon Optimal Control Problems: Nonconvex and Multicriteria Problems
In questa Nota si continua la discussione iniziata in [4] dell'esistenza di soluzioni ottimali per problemi di ottimo controllo in . Si definiscono problemi generalizzati, e si ottengono estensioni di risultati già presentati in [4]. Si dimostrano anche varie relazioni tra le soluzioni ottimali dei problemi generalizzati e i problemi originali e non convessi di ottimo controllo. Alla fine si considerano problemi lineari nelle variabili di stato anche nel caso di costi funzionali a valori vettoriali...
On the existence of periodic solutions of a semilinear wave equation with a superlinear forcing term
On the existence of positive solution for an elliptic equation of Kirchhoff type via Moser iteration method.
On the existence of solutions for impulsive Duffing dynamic equations on time scales with Dirichlet boundary conditions.
On the existence of solutions to a fourth-order quasilinear resonant problem.
On the fundamental group of the space of harmonic 2-spheres in the n-sphere.
On the genus of represenattion spheres.
On the Ginzburg–Landau model of a superconducting ball in a uniform field
On the harmonic maps from R 1,1 to S 1,1.
On the Instability of Minimal Submanifolds in Riemannian Manifolds of Positive Curvature.
On the inverse problem of the calculus of variations for ordinary differential equations
Lepagean 2-form as a globally defined, closed counterpart of higher-order variational equations on fibered manifolds over one-dimensional bases is introduced, and elementary proofs of the basic theorems concerning the inverse problem of the calculus of variations, based on the notion of Lepagean 2-form and its properties, are given.
On the inverse variational problem in nonholonomic mechanics
The inverse problem of the calculus of variations in a nonholonomic setting is studied. The concept of constraint variationality is introduced on the basis of a recently discovered nonholonomic variational principle. Variational properties of first order mechanical systems with general nonholonomic constraints are studied. It is shown that constraint variationality is equivalent with the existence of a closed representative in the class of 2-forms determining the nonholonomic system. Together with...
On the Isotropy of Compact Minimal Surfaces in CPn.
On the Jäger-Kaul theorem concerning harmonic maps
On the Kobayashi metric for perturbations of the ball.
On the meromorphic potential for a harmonic surface in a k-symmetric space.
On the minimizers of the Möbius cross energy of links.