Wednesday, April the 28th, 2004
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“Let us start our investigation of finite rank perturbations of self-adjoint operators with the simplest sort of perturbation—a rank one bounded perturbation. Let A be a self-adjoint (perhaps unbounded) operator in the Hilbert space H with domain Dom (A) … To discuss the eigenfunctions we restrict ourselves first to the case where all particles are bosons, respectively, fermions.” — S Albeverio & P Kurasov, Singular Perturbations of Differential Operators