Some non-linear s. p. d. e's that are second order in time.
Some problems in inverse scattering theory
Some problems of parabolic type with discontinuous nonlinearities on convex constraints
We study semilinear equations and inequalities of parabolic type with discontinuous nonlinearities, possibly subjected to convex or even nonconvex constraint conditions. To prove some existence theorems we regard the solutions as «curves of maximal relaxed slope» for a suitable functional on the given constraint.
Some properties of reachable solutions of nonlinear elliptic equations with measure data
Some regularity results for a family of variational inequalities
Some remarks on infinite-dimensional nonlinear elliptic problems.
Some remarks on the multi-dimensional Borg-Levinson theorem
Some results about multiplicity and bifurcation of stationary solutions of a reaction diffusion climatological model.
In this survey we collect several results concerning S-type bifurcation curves for the number of solutions of reaction-diffusion stationary equations. In particular, we recall several results in the literature for the case of stationary energy balance models.
Some results on the well-posedness of an integro-differential Frémond model for shape memory alloys.
Some simple nonlinear PDE's without solutions
In questo articolo consideriamo alcune semplici equazioni a derivate parziali elittiche nonlineari, per le quali il Teorema della Funzione Inversa, se applicato in modo formale, suggerisce l'esistenza di soluzioni. Nonostante ciò, proviamo che non esistono soluzioni neppure in vari sensi deboli. Un problema modello è dato da in , su , dove , , è un dominio limitato contenente . Per qualunque costante , arbitrariamente piccola, proviamo che questo problema non ammette soluzioni distribuzionali...
Some uniqueness results for Bernoulli interior free-boundary problems in convex domains.
Some weighted Hardy-type inequalities on anisotropic Heisenberg groups.
Source type positive solutions of nonlinear parabolic inequalities
Sparse adaptive Taylor approximation algorithms for parametric and stochastic elliptic PDEs
The numerical approximation of parametric partial differential equations is a computational challenge, in particular when the number of involved parameter is large. This paper considers a model class of second order, linear, parametric, elliptic PDEs on a bounded domain D with diffusion coefficients depending on the parameters in an affine manner. For such models, it was shown in [9, 10] that under very weak assumptions on the diffusion coefficients, the entire family of solutions to such equations...
Spatial smoothness of the stationary solutions of the 3D Navier-Stokes equations.
Spazi BV e di Nikolskii e applicazioni al problema di Stefan
Questa Nota è dedicata a mettere in evidenza alcune proprietà degli spazi delle funzioni a variazione limitata e degli spazi di Nikolskii ed , ( ), che non mi risulta siano già state esposte nella forma generale qui enunciata, quali la non separabilità, l'essere il duale di uno spazio di Banach separabile, la convergenza e la compattezza debole in e le loro applicazioni al classico problema di Stefan bifase.
SPDEs with coloured noise: Analytic and stochastic approaches
We study strictly parabolic stochastic partial differential equations on , d ≥ 1, driven by a Gaussian noise white in time and coloured in space. Assuming that the coefficients of the differential operator are random, we give sufficient conditions on the correlation of the noise ensuring Hölder continuity for the trajectories of the solution of the equation. For self-adjoint operators with deterministic coefficients, the mild and weak formulation of the equation are related, deriving...
Spectral properties of non-local uniformly-elliptic operators.
Spectral statistics for random Schrödinger operators in the localized regime
We study various statistics related to the eigenvalues and eigenfunctions of random Hamiltonians in the localized regime. Consider a random Hamiltonian at an energy in the localized phase. Assume the density of states function is not too flat near . Restrict it to some large cube . Consider now , a small energy interval centered at that asymptotically contains infintely many eigenvalues when the volume of the cube grows to infinity. We prove that, with probability one in the large volume...
Spline collocation for strongly elliptic equations on the torus.