Discrete Math › Section C · Graph theory › Topic C.5

Euler trails and Hamilton paths

A snowplough wants to clear every street once; a delivery van wants to call at every address once. The first question, about edges, has a complete and simple answer. The second, about vertices, is one of the hardest problems in computing.

In this topic

  • Seven bridges
  • Euler trails and circuits
  • Why degrees decide it
  • Euler's theorem
  • Worked example: tracing a trail
  • Worked example: fixing Königsberg
  • Hamilton paths and cycles
  • A guarantee: Dirac's theorem
  • Worked example: proving there is no Hamilton cycle
  • The travelling salesperson problem
  • Common mistakes to avoid
  • Key takeaways

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