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Rigid isotopy classification of real degree-4 planar rational curves with only real nodes (An elementary approach)
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classification
math.AG
keywords
realcurvesisotopyrationalrigidchorddegreeelementary
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abstract
We prove an elementary method to classify, up to rigid isotopy, all nodal degree 4 real rational curves in $\mathbb{RP}^2$ that have only real double points. We show how to associate a chord diagram to a nodal real degree 4 planar rational curve and prove that such curves are defined up to rigid isotopy by their chord diagrams.
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