Geodesic
On the Wu invariants for immersions of a graph into the plane
Homology, homotopy, and applications, Tome 12 (2010) no. 1, pp. 45-60.

Voir la notice de l'article provenant de la source International Press of Boston

We give an explicit calculation of the Wu invariants for immersions of a finite graph into the plane and classify all generic immersions of a graph into the plane up to regular homotopy by the Wu invariant. This result is a generalization of the fact that two plane curves are regularly homotopic if and only if they have the same rotation number.
DOI : 10.4310/HHA.2010.v12.n1.a5
Classification : 57M15, 57Q35
Keywords: immersion, graph, Wu invariant 
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Ryo Nikkuni. On the Wu invariants for immersions of a graph into the plane. Homology, homotopy, and applications, Tome 12 (2010) no. 1, pp. 45-60. doi : 10.4310/HHA.2010.v12.n1.a5. http://geodesic.mathdoc.fr/articles/10.4310/HHA.2010.v12.n1.a5/

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