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Principal and nonprincipal solutions of symplectic dynamic systems on time scales. (English) Zbl 0971.34018
Summary: The author establishes the concept of the principal and nonprincipal solution to the so-called symplectic dynamic systems on time scales. He presents a brief survey of the history of these concepts for differential and difference equations.

MSC:
34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations
39A10 Additive difference equations
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