Singular Quadratic Forms in Perturbation Theory 87 Erziehungsberechtigten sind

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Singular Quadratic Forms in Perturbation Theory 87 Erziehungsberechtigten sindThe notion of singular quadratic form appears in mathematical physics as a tool for the investigation of formal expressions corresponding to perturbations devoid of operator sense. Numerous physical models are based on the use of Hamiltonians containing perturba tion terms with singular properties. Typical examples of such expressions are Schrodin ger operators with O potentials ( ~ + AD) and Hamiltonians in quantum field theory with perturbations