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incidence_structure (277B)

      1 # Incidence structure
      2 
      3 https://en.wikipedia.org/wiki/Incidence_structure
      4 
      5 a relationship between two kinds of objects
      6 
      7 essentially a [graph_bipartite]
      8 
      9 [self_dual] if [isomorphism] when swapping both sides
     10 
     11 the corresponding graph is called the [levi_graph]
     12 
     13 Up: [mathematics]