2. Hamiltonian Circuit
The lecture discusses Hamiltonian circuits and paths, emphasizing their importance in graph theory. It introduces Dirac's and Ore's theorems as sufficient conditions for the existence of Hamiltonian circuits within graphs, highlighting the differences compared to Eulerian graphs. A thorough explanation of both sufficient conditions is provided, alongside proofs to enhance understanding of their application and limitations.
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Sections
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What we have learnt
- Hamiltonian circuits require each vertex of a graph to be visited exactly once without repetition.
- Dirac's theorem states that a connected graph with each vertex degree at least n/2 is Hamiltonian.
- Ore's condition relates to non-adjacent vertices and indicates that if the sum of their degrees is at least n, then the graph is Hamiltonian.
Key Concepts
- -- Hamiltonian Circuit
- A simple circuit in a graph that visits every vertex exactly once and returns to the starting vertex.
- -- Hamiltonian Path
- A path in a graph that visits every vertex exactly once but does not necessarily return to the starting vertex.
- -- Dirac's Theorem
- States that a connected graph with each vertex having a degree of at least n/2 contains a Hamiltonian circuit.
- -- Ore's Condition
- States that for any non-adjacent vertices u and v in a graph, if the sum of their degrees is at least n, the graph is Hamiltonian.
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