The paper deals with an initial problem of a parabolic variational inequality whichcontains a nonlinear elliptic form $a(v,w)$ having a potential $J\left(v\right)$, which is twice $G$-differentiable at arbitrary $v\in H^1\left(\Omega \right)$. This property of $a(v,w)$ makes it possible to prove convergence of an approximate solution defined by a linearized scheme which is fully discretized - in space by the finite elements method and in time by a one-step finite-difference method. Strong convergence of the approximate solution is proved without any regularity...

We prove that minimizers $u\in W^{1,n}$ of the functional $E_{}\left(u\right)=1/n{\int }_{|}{\nabla u|}^{n}dx+1/\left(4^n\right){\int }_{(}1-{\left|u\right|}^2{)}^{2}dx$, ⊂ ${ℝ}^n$, n ≥ 3, which satisfy the Dirichlet boundary condition $u_{}=g$ on for g: → $S^{n-1}$ with zero topological degree, converge in $W^{1,n}$ and $C_{loc}^{\alpha }$ for any α<1 - upon passing to a subsequence ${}_k\to 0$ - to some minimizing n-harmonic map. This is a generalization of an earlier result obtained for n=2 by Bethuel, Brezis, and Hélein. An example of nonunique asymptotic behaviour (which cannot occur in two dimensions if deg g = 0) is presented.

Si studiano problemi di autovalori per disequazioni variazionali semilineari ellittiche con un ostacolo puntuale sulla derivata prima della funzione incognita. Si mette in particolare in evidenza il ruolo della «ipotesi di non tangenza» tra il convesso, che viene definito dalla condizione di ostacolo, e la sfera dello spazio funzionale, su cui è naturale studiare un problema di autovalori. Tale condizione viene analizzata in alcuni casi concreti e si indicano alcune ipotesi che, garantendone la...