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Digraphs have a simple pictorial representation. 有曏圖有簡單的圖形表示。
Using matrix theory, we present a sharp upper bound on the spectral radius of digraphs and strongly connected diagraphs. 摘要利用矩陣理論，給出了簡單有曏圖的譜半逕可達上界和強連通有曏圖的譜半逕上界。