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four_color_theorem (201B)

      1 # Four color theorem
      2 
      3 Variant on graphs embedded in more general [genus]:
      4   - https://en.wikipedia.org/wiki/Heawood_conjecture
      5 
      6 Generalization: [inoue2024three]
      7 
      8 Up: [graph_coloring] of [planar_graph]