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Re:嘟嘟教你学英语In Reply To:嘟嘟教你学英语 Posted by:nbuacm09 at 2011-07-27 10:46:54 像我英语比较差,就直接看表达式了bottom(G)={v∈V|∀w∈V:(v→w)⇒(w→v)}.
这样也是可以没有歧义的~~
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