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graph_product_chromatic_number (372B)

      1 # Graph product chromatic number
      2 
      3 - [graph_direct_product]
      4   - the [chromatic_number] is at most the min of the chromatic number of the arguments
      5     - and the inequality can be strict [shitov2019counterexamples]
      6 - [graph_cartesian_product]
      7   - the [chromatic_number] is the sum of the two chromatic numbers: [Sabidussi's_theorem]
      8 
      9 Up: [graph_product], [chromatic_number]