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Is the \({\mathcal C}{\mathcal P}{\mathcal T}\) norm always positive? (English) Zbl 1065.81048


MSC:

81Q05 Closed and approximate solutions to the Schrödinger, Dirac, Klein-Gordon and other equations of quantum mechanics
34B24 Sturm-Liouville theory
34L05 General spectral theory of ordinary differential operators
81U15 Exactly and quasi-solvable systems arising in quantum theory
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