In a partial proper edge colouring with one uncoloured edge incident with a vertex , a Vizing fan is a sequence of neighbours of whose incident edge colours are missing at earlier fan vertices. With one more colour than the maximum degree, fan rotations and a two-colour Kempe chain free one common colour at the endpoints of the uncoloured edge.

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  1. Vizing theorem
  2. Edge chromatic number
  3. Graph colouring
  4. Graph theory
  5. Foundations of mathematics
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