The Equivalence of Two Problems on the Cube

The Equivalence of Two Problems on the Cube
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DOI:
10.1016/0097-3165(92)90060-8
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发表时间:
1992-09
期刊:
J. Comb. Theory A
影响因子:
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通讯作者:
C. Gotsman;N. Linial
C. Gotsman;N. Linial
中科院分区:
其他
文献类型:
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作者:
C. Gotsman;N. Linial

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用Qn表示超立方体Cn = {+1,−1}n的图。下面两个看似无关的问题是等价的:1。设G是Qn的导出子图,使得|V(G)|2n−1。记Δ(G)= maxx∈V(G)degG(x)和Γ(G)= max(Δ(G),Δ(Qn-G))。Γ(G)能被n的函数从下有界吗?2.设f:Cn→ {+1,−1}是一个布尔函数。atx的灵敏度表示为(f,x),是xinQn使得f(x)<$f(y)的邻域数。fiss(f)= maxx∈Cns(f,x)的灵敏度。将byd(f)表示为Cn上的真实的多线性多项式的唯一表示的次数。Cand(f)从上到下受s(f)的函数约束?
Denote byQnthe graph of the hypercubeCn= { +1, −1}n. The following two seemingly unrelated questions are equivalent: 1. LetGbe an induced subgraph ofQnsuch that |V(G)| ≠ 2n−1. DenoteΔ(G) = maxx∈V(G)degG(x) andΓ(G) = max(Δ(G),Δ(Qn−G)). CanΓ(G) be bounded from below by a function ofn?; 2. Letf:Cn→ {+1, −1} be a boolean function. Thesensitivityoffatx, denoteds(f,x), is the number of neighborsyofxinQnsuch thatf(x) ≠f(y). The sensitivity offiss(f) = maxx∈Cns(f,x). Denote byd(f) the degree of the unique representation offas a real multilinear polynomial onCn. Cand(f) be bounded from above by a function ofs(f)?