The minimum neighborhood and combinatorial property are two important indicators of fault tolerance of a multiprocessor system. Given a graph G, θ G (q) is the minimum number of vertices adjacent to a set of q vertices of G (1 ≤ q ≤ |V (G)|). It is meant to determine θ G (q), the minimum neighborhood problem (MNP). In this paper, we obtain θ AG n (q) for an independent set with size q in an n-dimensional alternating group graph AG n , a well-known interconnection network for multiprocessor systems. We first propose some combinatorial properties of AG n. Then, we study the MNP for an independent set of two vertices and obtain that θ AG n (2) = 4n − 10. Next, we prove that θ AG n (3) = 6n − 16. Finally, we propose that θ AG n (4) = 8n − 24. INDEX TERMS Minimum neighborhood, combinatorial property, fault tolerance, independent set, alternating group graphs.
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