4. Write down a vertex sequence for an Euler circuit or Euler path in the following graph, if either exists. If neither exist, state why that is so. a

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4.
Write down a vertex sequence for an Euler circuit or Euler path in the following graph, if either
exists. If neither exist, state why that is so.
a
Transcribed Image Text:4. Write down a vertex sequence for an Euler circuit or Euler path in the following graph, if either exists. If neither exist, state why that is so. a
Expert Solution
Step 1

From the given graph:

Vertex Degree
a 4
b 3
c 3
d 6
e 2
f 2
g 2
h 2
i 6
Step 2

An Euler path is a path that uses every edge in a graph only once. Because it is a path, it does not have to return to the starting vertex.

An undirected graph has an Eulerian Path if the following two conditions are true. 

  1. All vertices with non-zero degrees are connected.
  2. If zero/two vertices have odd degree and all other vertices have even degree. 

Note: Only one vertex with an odd degree is not possible in an undirected graph. Because the sum of all degrees is always even in an undirected graph.

The Euler Circuit is a special type of Euler path, where the starting and ending vertices of the Euler path are the same.

 

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