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Published in 2021 at "Electronic Journal of Qualitative Theory of Differential Equations"
DOI: 10.14232/ejqtde.2021.1.16
Abstract: This paper is devoted to the study of the period function of planar generic and non-generic turning points. In the generic case (resp. non-generic) a non-degenerate (resp. degenerate) center disappears in the limit e →…
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Keywords:
planar turning;
period function;
function planar;
turning points ... See more keywords