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math.SP2011
Spectral Properties of Some Degenerate Elliptic Differential Operators
Roger T. Lewis
In this paper we extend classical criteria for determining lower bounds for the least point of the essential spectrum of second-order elliptic differential operators on domains $Ω\…
math.AP2011★ 5 cited
A geometric characterization of a sharp Hardy inequality
Roger T. Lewis, Junfang Li, Yanyan Li
In this paper, we prove that the distance function of an open connected set in with a boundary is superharmonic in the distribution sense if and only if t…