김동규

Bouchet (1987) defined delta-matroids by relaxing the base exchange axiom of matroids. Oum (2009) introduced a graphic delta-matroid from a pair of a graph and its vertex subset. We define a $\mathrm{\Gamma }$-graphic delta-matroid for an abelian group $\mathrm{\Gamma }$, which generalizes a graphic delta-matroid. For an abelian group $\mathrm{\Gamma }$, a $\mathrm{\Gamma }$-labelled graph is a graph whose …