“[It is a] well-known fact that the likely contacts of two individuals who are closely acquainted tend to be more overlapping than those of two arbitrarily selected individuals”

—  Anatol Rapoport

Anatol Rapoport (1954, p. 75); as quoted in: Samuel Leinhardt (1977) Social Networks: A Developing Paradigm, p. 350
1950s

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Anatol Rapoport 45
Russian-born American mathematical psychologist 1911–2007

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