In chapter 4, the conception of binding number of undirected graphs is introduced to digraphs, based on which the relationship between degree condition of vertices and girth is generalized to the relationship between neighborhood condition of vertices sets and girth.
第四章将有向图的度条件(顶点的邻域)与围长的关系进行了推广，考虑结合数(点集合的邻域条件)与围长的关系。
参考来源 - 有向图中若干问题的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
We test the separability of the density matrix by researching the simple combinatorial condition (the "degree condition"), the condition is directly related to the PPT-criterion.
通过对图的密度矩阵简单的组合条件(“度数条件”)判断图的密度矩阵的可分性。这个条件直接与PPT判据相联系。
Cash incentives, for example, can provide a degree of protection, particularly if they come with the condition that parents look after the health and nutrition of their children.
例如，通过现金激励措施，可以提供一定程度的保护，尤其是在附加以下条件的情况下——父母必须重视孩子的健康和营养状况。
Conclusion: the selection of refractive surgery in patients with myopia should be based on age, condition of the lens, degree of myopia, and monocular and binocular refraction.
结论：近视患者的屈光矫正手术的术式选择，应根据年龄、晶状体情况、近视程度和单、双眼情况，进行综合判断决定。
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