Let G be a graph and R be a subset of its vertices. A subset of vertices DR is called R-dominating target if every connected subgraph of G containing Da dominates R. In addition, if each vertex of DR has some R verter in its closed neighborhood, then we call it an essential-R-dominating-target.

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Q: minimum

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Minimum Spanning Tree

A spanning tree is a sub-graph of a connected, undirected graph. It has all the vertices of a graph with the minimum possible number of edges. If a vertex is skipped, then it will not be a spanning tree. The edges of a spanning tree may or may not have weights.