Unter- und Überbestimmte Systeme von Differentialgleichungen
Reference: Mathematische Semesterberichte, 57 (2010) 231-268
Description: This article (written in German) is a comparatively elementary introduction to some ideas of the formal theory centering around the question how one can rigorously define the notion of an under- or overdetermined system of differential equations. It begins with many examples and then gradually introduces more advanced mathematical concepts like jet bundles and symbol modules.
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