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eulers_formula (203B)

      1 # Euler's formula
      2 
      3 https://en.wikipedia.org/wiki/Euler_characteristic#Plane_graphs
      4 
      5 https://en.wikipedia.org/wiki/Planar_graph#Euler's_formula
      6 
      7 Up: [planar_graph]
      8 
      9 See also: [crossing_number_inequality]