Signed total double Roman dominating functions in graphs

Figures & data

Fig. 1 The graph G₁.

Fig. 2 The graphs H_i and $H_i^{\prime }$.

Fig. 3 The graphs F_i and $F_i^{\prime }$.

Fig. 4 NP-completeness of signed total double Roman for bipartite graphs.

Fig. 5 NP-completeness of signed total double Roman for chordal graphs.