For pairwise disjoint subsets S1, S2, ···, S2n of V(G), β2n(G, S1, S2,···, S2n) denotes the graph obtained from G by contracting each Si, i = 1, 2, ···, 2n, to a single vertex respectively.
设S1,S2,…,S2n是V(G)的两两不相交的子集,将Si,i=1,2,…,2n,分别收缩为一点所得到的图记β2n(G,S1,S2,…,S2n)。
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