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设G(A,A2;E)为2连通偶图,(A1,A2)为顶点二分划,D(x)={y|y∈V(G)\{x},d(x,y)=2},d^*d(x)表示D(x)∪{x}中所有的度排成的非减度序列(d^*1,d^*2,…,d^*j,…,d^*|D(x)|+1)中当下标j=d(x)时的度而当|D(x)|+1<d(x)时d^*d(x)=d^*|D(x)|+1。δ0=min{d(x)|x∈V(G)},δi=min{d^