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On the reduction of connection problems for differential equations with an irregular singular point to ones with only regular singularities. I. (English) Zbl 0468.34024

MSC:
34C20 Transformation and reduction of ordinary differential equations and systems, normal forms
34C05 Topological structure of integral curves, singular points, limit cycles of ordinary differential equations
34A30 Linear ordinary differential equations and systems
44A10 Laplace transform
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