An argument principle for real functions and nonharmonic singularities in the plane

DOI10.1216/rmj.2024.54.1131MaRDI QIDQ6635534

Joel C. Langer

Publication date: 12 November 2024

Published in: Rocky Mountain Journal of Mathematics (Search for Journal in Brave)

zbMATH Keywords

rational functionsSturm sequencescounting zerosplanar foliation singularities

Mathematics Subject Classification ID

Geometric methods in ordinary differential equations (34A26) Plane and space curves (14H50) Real rational functions (26C15)

Cites Work

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• Persson's list of singular fibers for a rational elliptic surface
• Qualitative theory of planar differential systems
• On foliations of the real projective plane defined by decomposable pencils of cubics

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