Minimum 2-tuple dominating set of permutation graphs
For a fixed positive integer k, a k-tuple dominating set of a graph G=(V,E) is a subset D?V such that every vertex in V is dominated by at least k vertex in D. The k-tuple domination number ? k (G) is the minimum size of a k-tuple dominating set of G. The special case when k=1 is the usual domination. The case when k=2 was called double domination or 2-tuple domination. A 2-tuple dominating set D 2 is said to be minimal if there does not exist any D??D 2 such that D? is a 2-tuple dominating set of G. A 2-tuple dominating set D 2, denoted by ? 2(G), is said to be minimum, if it is minimal as well as it gives 2-tuple domination number. In this paper, we present an efficient algorithm to find a minimum 2-tuple dominating set on permutation graphs with n vertices which runs in O(n 2) time.
2-tuple domination domination permutation graphs k-tuple domination design of algorithms analysis of algorithms 05c78