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Triadic closure
Triadic closure is a concept in social network theory, first suggested by German sociologist Georg Simmel in his 1908 book ''Soziologie'' (Investigations on the Forms of Sociation'' ).〔(Georg Simmel ), originator of the concept: "Facebook" article at the New York Times website. Retrieved on December 21, 2007.〕 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 a weak or strong tie between B-C.〔(Working concept ) of triadic closure: book review of Duncan Watts' "Six Degrees: The Science of a Connected Age" at the ''Serendip'' (Bryn Mawr College) website. Retrieved on December 21, 2007.〕 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.〔Easley, D, & Kleinberg, J. (2010). Networks, crowds, and markets: reasoning about a highly connected world. Cornell, NY: Cambridge Univ Pr.〕
==History==
Triadic closure was made popular by Mark Granovetter in his 1973 article ''The Strength of Weak Ties''.〔Granovetter, M. (1973). "(The Strength of Weak Ties )", American Journal of Sociology, Vol. 78, Issue 6, May 1360-80.〕 There he synthesized the theory of cognitive balance first introduced by Fritz Heider in 1946 with a Simmelian understanding of social networks. In general terms, cognitive balance refers to the propensity of two individuals to want to feel the same way about an object. If the triad of three individuals is not closed, then the person connected to both of the individuals will want to close this triad in order to achieve closure in the relationship network.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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