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Triadic closure is a concept in social network theory, first suggested by German sociologist Georg Simmel in his 1908 book Soziologie [Sociology: Investigations on the Forms of Sociation]. Triadic closure is the property among three nodes A, B, and C, such that if a strong tie exists between A-B and A-C, there is only a strong tie between B-C. This property is too extreme to hold true across very large, complex networks, but it is a useful simplification of reality that can be used to understand and predict networks.

Triadic closure is a concept in social network theory, first suggested by German sociologist Georg Simmel in his 1908 book Soziologie [Sociology: Investigations on the Forms of Sociation]. Triadic closure is the property among three nodes A, B, and C, such that if a strong tie exists between A-B and A-C, there is only a strong tie between B-C. This property is too extreme to hold true across very large, complex networks, but it is a useful simplification of reality that can be used to understand and predict networks.

'''<font color="#FF8000">三元闭包</font>'''是'''<font color="#FF8000">社会网络</font>'''理论中的一个概念，最早由德国社会学家格奥尔格·西梅尔 Georg Simmel于1908年在其著作《社会学：社会形式的调查》中提出。 三元闭包是关于A，B，C三个节点的一种性质，即当节点A与节点B、节点A与节点C之间均为强连接时，节点B与节点C之间也必定为强连接。尽管这一性质对于规模较大的'''<font color="#FF8000">复杂网络</font>'''而言过于严格，以至于其往往难以被满足，然而在理解网络、预测网络等方面，它却是对现实的一种有用的简化。

'''<font color="#FF8000">三合闭包 Triadic Closure </font>'''是'''<font color="#FF8000">社会网络理论 Social Network Theory </font>'''中的一个概念，最早由德国社会学家格奥尔格·西梅尔（Georg Simmel）在其1908年的著作《社会学：社会形式的调查》中提出。 三元闭合是三个节点A，B和C之间的属性，因此，如果A-B和A-C之间存在牢固的联系，则B-C之间仅存在牢固的联系。 这个属性太极端了，无法在非常大的'''<font color="#FF8000">复杂网络 Complex Network </font>'''中实现，但是它是对现实的有用简化，可以用来理解和预测网络。