5. Lecture - 54
The chapter delves into the concept of graphic sequences in graph theory, specifically focusing on the Havel-Hakimi theorem for determining if a given degree sequence can represent a simple graph. It outlines necessary conditions for a sequence to be classified as graphic, offers methods for constructing sequences, and provides detailed proofs of the theorem's implications. Additionally, the chapter presents exercises and activities that reinforce the concepts discussed throughout.
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Sections
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What we have learnt
- A graphic sequence is one that can construct a simple graph with the given degree sequence.
- The Havel-Hakimi theorem provides a method to determine if a sequence is graphic through iterative reduction.
- The sum of degrees in any graph must be an even number, which is a vital characteristic of graphic sequences.
Key Concepts
- -- Graphic Sequence
- A sequence of non-negative integers representing the degrees of the vertices of a simple graph.
- -- HavelHakimi Theorem
- A theorem that states a degree sequence is graphic if and only if the constructed reduced sequence is also graphic.
- -- Degree Sequence
- The list of degrees of the vertices in a graph, typically arranged in non-increasing order.
Additional Learning Materials
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