The extension problem for fractional Sobolev spaces with a partial vanishing trace condition

Abstract

We construct whole-space extensions of functions in a fractional Sobolev space of order $s\in (0,1)$ and integrability $p\in (0,\infty )$ on an open set $O$ which vanish in a suitable sense on a portion $D$ of the boundary $\partial O$ of $O$. The set $O$ is supposed to satisfy the so-called interior thickness condition in $\partial O\setminus D$, which is much weaker than the global interior thickness condition. The proof works by means of a reduction to the case $D=\varnothing$ using a geometric construction.

Completely rewritten to only focus on the extension problem. 6 pages. To be submitted

References in corpus (1)

• Properties of Kondratiev spaces