In this paper we focus on adaptive methods for discretizing convection{diiusion equations by means of the nonconforming P 1 {{nite element. Local lower estimates for residual based a posteriori error estimators in a discrete H 1 {norm and in the L 2 {norm are proven. Moreover, a residual based a posteriori error estimator in the L 2 {norm is derived. The behaviour of local error estimators is i...

In this paper, we present some results of an ongoing research involving the design and implementation, in an eGovernment scenario, of a multiversion repository of norm texts supporting efficient and personalized access. In particular we defined a multi-version XML data model supporting both temporal versioning –essential in normative systems– and semantic versioning. Semantic versioning is base...

In this paper we focus on adaptive methods for discretizing convection{diiusion equations by means of the nonconforming P 1 {{nite element. Local lower estimates for residual based a posteriori error estimators in a discrete H 1 {norm and in the L 2 {norm are proven. Moreover, a residual based a posteriori error estimator in the L 2 {norm is derived. The behaviour of local error estimators is i...

We consider differences of weighted composition operators between given weighted Bergman spaces H∞ v of infinite order and characterize boundedness and the essential norm of these differences.

In this paper, the connection between Menger probabilistic norms and H"{o}hle probabilistic norms is discussed. In addition, the correspondence between probabilistic norms and Wu-Fang fuzzy (semi-) norms is established. It is shown that a probabilistic norm (with triangular norm $min$) can generate a Wu-Fang fuzzy semi-norm and conversely, a Wu-Fang fuzzy norm can generate a probabilistic norm.

Abstract In this article, all sequences u {\boldsymbol{u}} , mathvariant="bold-italic">v {\boldsymbol{v}} and mathvariant="bold-italic">w {\boldsymbol{w}} that define continuous compact tridiagonal operators T u ,...