Bipartite graphs that are not circle graphs
Annales de l'Institut Fourier, Volume 49 (1999) no. 3, pp. 809-814

The following result is proved: if a bipartite graph is not a circle graph, then its complement is not a circle graph. The proof uses Naji’s characterization of circle graphs by means of a linear system of equations with unknowns in GF (2).

At the end of this short note I briefly recall the work of François Jaeger on circle graphs.

Nous prouvons le résultat suivant : si un graphe biparti n’est pas un graphe de cordes, alors son complément n’est pas un graphe de cordes. La preuve fait appel à une caractérisation des graphes de cordes par Naji, qui utilise un système d’équations linéaires sur le corps à deux éléments.

À la fin de cette note je rappelle brièvement le travail de François Jaeger sur les graphes de cordes.

Bouchet, André. Bipartite graphs that are not circle graphs. Annales de l'Institut Fourier, Volume 49 (1999) no. 3, pp. 809-814. doi: 10.5802/aif.1693
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