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Automorphisms and derivations of differential equations and algebras. (English) Zbl 0809.34015

Automorphisms and derivations of quadratic differential systems are investigated. The authors give conditions of exponential representations of solutions. Some examples of systems with periodic and quasiperiodic solutions are considered.
Reviewer: S.Mazanik (Minsk)

MSC:

34A25 Analytical theory of ordinary differential equations: series, transformations, transforms, operational calculus, etc.
34A34 Nonlinear ordinary differential equations and systems
34C25 Periodic solutions to ordinary differential equations
34C27 Almost and pseudo-almost periodic solutions to ordinary differential equations
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