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friendship_theorem (293B)

      1 # Friendship theorem
      2 
      3 https://en.wikipedia.org/wiki/Friendship_graph#Friendship_theorem
      4 
      5 "if in a [graph] any pair of vertices have exactly one common [neighbor] then the graph is a [friendship_graph]"
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      7 In [graph_directed]: [choi2023digraph]
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      9 Up: [graph_theory]
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     11 See also: [handshaking_lemma]