Newton-Sobolev spaces, as presented by N. Shanmugalingam, describe a way to extend Sobolev spaces to the metric setting via upper gradients, for metric spaces with ´sucient´ paths of nite length. Sometimes, as is the case ...

We obtain improved fractional Poincaré and Sobolev-Poincaré inequalities including powers of the distance to the boundary in bounded John, s-John, and Hölder-α domains, and discuss their optimality.

We study the problem -Δu=f, where f has a point-singularity. In particular, we are interested in f = δx0, a Dirac delta with support in x0, but singularities of the form f|x - x0|-s are also considered. We prove the stability ...

We develop an a posteriori error estimator which focuses on the local H1 error on a region of interest. The estimator bounds a weighted Sobolev norm of the error and is efficient up to oscillation terms. The new idea is ...

The main topic of the thesis is the study of Elliptic Partial Differential Equations. The thesis is divided into two Parts: (I) Trudinger-Moser Type inequality on weighted Sobolev spaces; and (II) on existence and nonexistence ...

This paper presents wavelet characterizations through heavy space Orlicz type standards, such as heavy Orlicz spaces, Orlicz-Sobolev and Hardy-Orlicz. For the study of Orlicz spaces and Orlicz-Sobolev weight used various ...