圖論內,樹狀圖arborescence)是一個有向圖;並且,對其中一個我們稱呼作的頂點,以及任何其他頂點,此圖必然存在且只存在一條從的路徑。換句話說,樹狀圖是一個有向的,有根的,並且所有的邊都指離根的方向。所有的樹狀圖都是一個有向無環圖

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