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  1. Upper bound on chromatic number of graph in terms of number of edges | graph theory | elementary

    Upper bound on chromatic number of graph in terms of number of edges | graph theory | elementary

    28
  4. The chromatic number of a graph and min degrees of its subgraphs | graph theory | intermediate level

    The chromatic number of a graph and min degrees of its subgraphs | graph theory | intermediate level

    17
  6. Proper colorings and the chromatic number of graphs | graph theory | elementary level

    Proper colorings and the chromatic number of graphs | graph theory | elementary level

    32
  7. Fractional colorings and the fractional chromatic number of graphs | graph theory | advanced level

    Fractional colorings and the fractional chromatic number of graphs | graph theory | advanced level

    2
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  8. The incorrect proof of the Dirac's theorem about Hamiltonian graphs on ProofWiki

    The incorrect proof of the Dirac's theorem about Hamiltonian graphs on ProofWiki

    25
  9. Magic Chess Tours Explained — Knights, Kings & Impossible Moves | Numberphile

    Magic Chess Tours Explained — Knights, Kings & Impossible Moves | Numberphile

    41