4 papers
On the numerical range of second order elliptic operators with mixed boundary conditions in
Ralph Chill, Hannes Meinlschmidt, Joachim Rehberg
We consider second order elliptic operators with real, nonsymmetric coefficient functions which are subject to mixed boundary conditions. The aim of this paper is to provide unifor…
Extrapolated Elliptic Regularity and Application to the van Roosbroeck system of Semiconductors
Hannes Meinlschmidt, Joachim Rehberg
In this paper we present a general extrapolated elliptic regularity result for second order differential operators in divergence form on fractional Sobolev-type spaces of negative…
Optimal control of an energy-critical semilinear wave equation in 3D with spatially integrated control constraints
Karl Kunisch, Hannes Meinlschmidt
This paper is concerned with an optimal control problem subject to the -critical defocusing semilinear wave equation on a smooth and bounded domain in three spatial dimensions…
-estimates for the Neumann problem on general domains
A. F. M. ter Elst, Hannes Meinlschmidt, Joachim Rehberg
Let be bounded open and connected. Suppose that for some . Let be a pure second-order elliptic differential operator…