Abstract:
A description of all the maximal accretive extensions and their resolvents is given for a densely defined closed sectorial operator in terms of abstract boundary conditions. These results are applied to parametrize all the $m$-accretive extensions of a symmetric operator in a planar model of one-centre point interaction.
Bibliography: 40 titles.
Keywords:sectorial operator, accretive operator, linear relation, Friedrichs extension, boundary triplet.