On depth-reduction and grates

On depth-reduction and grates
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关于深度减少和格栅

DOI:
10.1109/sfcs.1983.38
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发表时间:
1983
期刊:
24th Annual Symposium on Foundations of Computer Science (sfcs 1983)
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通讯作者:
G. Schnitger
G. Schnitger
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文献类型:
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作者:
G. Schnitger

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对于每个ε(0≤ε≪1)一个循环挖掘的family gn =(v(gn),e(gn))具有以下属性的建设性定义:(a)#v(gn)≤n¿ 2n+2(b)度(gn)≤恒定(c),必须删除ω(n€2n)边缘,以便将GN的深度降低到(2n)ε。 ,c2 ≫0,有(fn,n) - grate(请参阅n中的size 1),其中fn(x):= c1。 n2x≤c2¿ N/0否则
For each ε(0 ≤ ε ≪ 1) a family Gn =(V(Gn), E(Gn)) of a cyclic digraphs can be constructively defined having the following properties: (a) #V(Gn) ≤ n ¿ 2n+2 (b) degree (Gn) ≤ constant (c) it is necessary to remove Ω(n ¿ 2n) edges in order to reduce the depth of Gn to (2n)ε. It is then shown: For suitable constants c1, C2 ≫ 0, there are (fn, n)- grates (see Definition 1) of size linear in n, where fn(x):= c1 ¿ n2 x ≤ c2 ¿ n/0 otherwise