Finding dominating induced matchings in [formula omitted]-free graphs in polynomial time

Abstract

Let G=(V,E) be a finite undirected graph. An edge set E′⊆E is a dominating induced matching (d.i.m.) in G if every edge in E is intersected by exactly one edge of E′. The Dominating Induced Matching (DIM) problem asks for the existence of a d.i.m. in G; this problem is also known as the Efficient Edge Domination problem; it is the Efficient Domination problem for line graphs.The DIM problem is NP-complete even for very restricted graph classes such as planar bipartite graphs with maximum degree 3 but is solvable in linear time for P7-free graphs, and in polynomial time for S1,2,4-free graphs as well as for S2,2,2-free graphs and for S2,2,3-free graphs. In this paper, combining two distinct approaches, we solve it in polynomial time for S1,1,5-free graphs.