EXPLICIT EXPANDERS OF EVERY DEGREE AND SIZE

EXPLICIT EXPANDERS OF EVERY DEGREE AND SIZE
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DOI:
10.1007/s00493-020-4429-x
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发表时间:
2021-02-01
期刊:
影响因子:
1.1
通讯作者:
Alon, Noga
Alon, Noga
中科院分区:
数学2区
文献类型:
--
作者:
Alon, Noga

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An(n,d,lambda)-graph是n个顶点上的常规图,其中任何非平凡特征值的绝对值最多都是lambda。对于任何常数的d> = 3,epsilon> 0和所有足够大的n,我们表明存在确定性的poly(n)时间算法,该算法输出A a(n,d,lambda)-graph(在n个顶点上) (0)(epsilon)和n> n(0)(d; epsilon)我们提出了一个强烈的明确结构(M; d; lambda) - 用lambda的图表
An (n, d, lambda)-graph is a d regular graph on n vertices in which the absolute value of any nontrivial eigenvalue is at most lambda. For any constant d >= 3, epsilon > 0 and all sufficiently large n we show that there is a deterministic poly(n) time algorithm that outputs an (n, d, lambda)-graph (on exactly n vertices) with lambda d(0)(epsilon) and n>n(0)(d; epsilon) we present a strongly explicit construction of an (m;d;lambda)-graph with lambda