On the Principal Eigenvalues of Indefinite Elliptic Problems.
On the second order derivatives of convex functions on the Heisenberg group
In the euclidean setting the celebrated Aleksandrov-Busemann-Feller theorem states that convex functions are a.e. twice differentiable. In this paper we prove that a similar result holds in the Heisenberg group, by showing that every continuous –convex function belongs to the class of functions whose second order horizontal distributional derivatives are Radon measures. Together with a recent result by Ambrosio and Magnani, this proves the existence a.e. of second order horizontal derivatives for...
One dimensional symmetry in the Heisenberg group
One-sided Mullins-Sekerka flow does not preserve convexity.
Optimal conditions for anti-maximum principles
Optimal control of electromagnetic energy.
Osservazione sulla risolubilità del problema di Dirichlet per una classe di equazioni ellittiche a coefficienti discontinui
Overdetermined problems and the -Laplacian