New to graph theory and I'm surprised I cannot find any solid clarification on this: For two nodes and one undirected connecting edge, can this be considered a tree graph where both nodes are leaves-- or is the minimum number of nodes on a tree graph three? What about if the connecting edge is directed?
2026-04-02 04:25:53.1775103953
Tree graph with only two nodes
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This is a tree. A tree is a connected, acyclic graph. A single edge certainly satisfies this definition.