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math.FA2020★ 24 cited
Semi-uniform stability of operator semigroups and energy decay of damped waves
R. Chill, D. Seifert, Y. Tomilov
Only in the last fifteen years or so has the notion of semi-uniform stability, which lies between exponential stability and strong stability, become part of the asymptotic theory o…
math.AP2020
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…