Preface.- Introduction.- The Antonov Stability Estimate.- On the Period Function $T_1$.- A Birman-Schwinger Type Operator.- Relation to the Guo-Lin Operator.- Invariances.- Appendix I: Spherical Symmetry and Action-Angle Variables.- Appendix II: Function Spaces and Operators.- Appendix III: An Evolution Equation.- Appendix IV: On Kato-Rellich Perturbation Theory.
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