(b) Show that G may not necessarily have three cycle subgraphs by giving an example of a graph G, and vertices x and y of G, so that there are at least three distinct x-y paths but G only has two cycle subgraphs. Label the vertices of G and give the paths explicitly.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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How to do b

(a) Suppose G = (V, E) is a connected simple graph, and let x, y E V be two vertices in G. Show that if
there are three distinct (not necessarily disjoint) paths from x to y in G, then G has at least two cycle
subgraphs.
Note: You may use any result in the course notes and assignments without proof. If necessary, you may
also use the fact that in a tree there is always a unique path between any two vertices.
(b) Show that G may not necessarily have three cycle subgraphs by giving an example of a graph G, and
vertices x and y of G, so that there are at least three distinct x-y paths but G only has two cycle
subgraphs. Label the vertices of G and give the paths explicitly.
Transcribed Image Text:(a) Suppose G = (V, E) is a connected simple graph, and let x, y E V be two vertices in G. Show that if there are three distinct (not necessarily disjoint) paths from x to y in G, then G has at least two cycle subgraphs. Note: You may use any result in the course notes and assignments without proof. If necessary, you may also use the fact that in a tree there is always a unique path between any two vertices. (b) Show that G may not necessarily have three cycle subgraphs by giving an example of a graph G, and vertices x and y of G, so that there are at least three distinct x-y paths but G only has two cycle subgraphs. Label the vertices of G and give the paths explicitly.
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