# An Euler graph G is a graph that has a closed Euler trail. An Euler trail is a trail that contains every edge of G exactly once. Which subgraph with four edges of the graph in Example 1,is an Euler graph?

Chapter 23, PROBLEM SET 23.2 #15

An Euler graph G is a graph that has a closed Euler trail. An Euler trail is a trail that contains every edge of G exactly once. Which subgraph with four edges of the graph in Example 1,is an Euler graph?

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