1. Introduction 2. Canonical systems and related differential equations 3. Matrix valued functions in the Nevanlinna class 4. Interpolation problems, resolvent matrices and de Branges spaces 5. Chains that are matrizants and chains of associated pairs 6. The bitangential direct input scattering problems 7. Bitangential direct input impedance and spectral problems 8. Inverse monodromy problems 9. Bitangential Krein extension problems 10. Bitangential inverse input scattering problems 11. Bitangential inverse input impedance and spectral problems 12. Dirac-Krein systems Bibliography Index.
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