Abstract
In this paper we will give a combinatorial characterization of the double point set of a generic immersion of the 2-sphere into 3 without triple points.
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Lippner, G. On double points of immersions of spheres. manuscripta math. 113, 239–250 (2004). https://doi.org/10.1007/s00229-003-0435-8
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DOI: https://doi.org/10.1007/s00229-003-0435-8