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Geometrical approach to linear differential equations of the $$n$$-th order. (English) Zbl 0257.34029

##### MSC:
 34A30 Linear ordinary differential equations and systems 34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations 34A25 Analytical theory of ordinary differential equations: series, transformations, transforms, operational calculus, etc. 34C20 Transformation and reduction of ordinary differential equations and systems, normal forms