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Elliptic planar vector fields with degeneracies. (English) Zbl 1246.35090
This paper deals with the normalization of elliptic vector fields in the plane that degenerate along a simple and closed curve. The associated homogeneous equation $$Lu=0$$ is studied and application to a degenerate Beltrami equation is given.

##### MSC:
 35J70 Degenerate elliptic equations 30G20 Generalizations of Bers and Vekua type (pseudoanalytic, $$p$$-analytic, etc.) 35F05 Linear first-order PDEs
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##### References:
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