Question: Verify that in an undirected graph, the is reachable from relation is an equivalence relation on the vertices of the graph. Which of the three

Verify that in an undirected graph, the “is reachable from” relation is an equivalence relation on the vertices of the graph. Which of the three properties of an equivalence relation hold in general for the “is reachable from” relation on the vertices of a directed graph?

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