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An abstract framework for interior-boundary conditions

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arxiv 2103.17124 v2 pith:TI4CNGUW submitted 2021-03-31 math.SP math-phmath.MP

classification math.SPmath-phmath.MP
keywords boundaryconditionsabstractinteriorinterior-boundaryadditionallyadditiveappear
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In a configuration space whose boundary can be identified with a subset of its interior, a boundary condition can relate the behaviour of a function on the boundary and in the interior. Additionally, boundary values can appear as additive perturbations. Such boundary conditions have recently provided insight into problems form quantum field theory. We discuss interior-boundary conditions in an abstract setting, with a focus on self-adjoint operators, proving self-adjointness criteria, resolvent formulas, and a classification theorem.

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