B6) Show that the following graphs Hamiltonian are hot a a) d d 137 c) ol
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Transcribed Image Text:### Problem 36
**Objective:** Show that the following graphs are not Hamiltonian.
#### Graph Descriptions
**a)**
- This graph is composed of two triangles joined by a shared vertex.
- Vertices are labeled as: \(a, b, c, d, e, f, g, h\).
- There is a triangle formed by the vertices \(a, f, g\).
- A second triangle is formed by \(b, e, f\).
- Both triangles meet at vertex \(f\).
- Additionally, a link exists forming a triangle with vertices \(b, c, d\).
**b)**
- This diagram is a complete bipartite graph known as \(K_{3,3}\).
- There are six vertices: \(a, b, c, d, e, f\).
- Three vertices at the top (\(a, b, c\)) are connected to three at the bottom (\(d, e, f\)).
- Edges criss-cross, making connections between the non-adjacent vertices of the two groups.
**c)**
- This graph forms a star structure.
- Vertices are labeled \(a, b, c, d, e\).
- There is a central vertex \(c\) connected to four peripheral vertices \(a, b, d, e\).
- Vertices \(a\) and \(b\) are connected by a line, so are \(d\) and \(e\).
**d)**
- This graph consists of a quadrilateral formed by a single triangle joined at one vertex to another point.
- It has five total vertices in the shape, forming two separate triangles connected by one common vertex.
#### Analysis
**Notes:**
- A Hamiltonian graph is one that contains a Hamiltonian cycle, a loop that visits each vertex exactly once and returns to the starting vertex.
- All four graphs exhibit characteristics that prevent the formation of such a cycle, usually due to excessive intersections or separate components that cannot be traversed without revisiting vertices.
**Educational Insight:**
Understanding why certain graphs are non-Hamiltonian is crucial for students studying graph theory, as it reinforces the structural properties and constraints affecting cycle formation.
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