A characterization of intermediate Weyl coefficients

Langer, Matthias and Woracek, Harald (2002) A characterization of intermediate Weyl coefficients. Monatshefte für Mathematik, 135 (2). pp. 137-155. ISSN 0026-9255 (https://doi.org/10.1007/s006050200011)

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Abstract

In connection with an indefinite analogue of canonical systems of differential equations some subclasses of the Nevanlinna class come up. We give a criterion for a function to belong to in terms of its poles and residues