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math.FA2005
Operator Holes and extensions of sectorial operators and dual pairs of contractions
Mark Malamud
A description of the set of -sectorial extensions of a dual pair of nonnegative operators is obtained. Some classes of nonaccretive extensions of the dual pair $\{…
math.FA2000
On the number of square integrable solutions and self-adjointness of symmetric first order systems of differential equations
Matthias Lesch, Mark M. Malamud
The main purpose of this paper is to investigate the formal deficiency indices of a symmetric first order system on an interval , wh…