2011-07-13Buch DOI: 10.18452/2767
Linear differential-algebraic equations with properly stated leading term
We examine in this paper so-called B-critical points of linear, time-varying differential-algebraic equations (DAEs) of the form A(t)(D(t)x(t))' + B(t)x(t) = q(t). These critical or singular points, which cannot be handled by classical projector methods, require adapting a recently introduced framework based on Π-projectors. Via a continuation of certain invariant spaces through the singularity, we arrive at an scenario which accommodates both A- and Bcritical DAEs. The working hypotheses apply in particular to standard-form analytic systems although, in contrast to other approaches to critical problems, the scope of our approach extends beyond the analytic setting. Some examples illustrate the results.
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Is Part Of Series: Preprints aus dem Institut für Mathematik - 9, Mathematik-Preprints, ISSN:0863-0976