An Elementary Proof of a 3n - o(n) Lower Bound on the Circuit Complexity of Affine Dispersers
An Elementary Proof of a 3n - o(n) Lower Bound on the Circuit Complexity of Affine Dispersers
复制标题
仿射分散器电路复杂度的 3n - o(n) 下界的基本证明
DOI:
10.1007/978-3-642-22993-0_25
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发表时间:
2011
期刊:
影响因子:
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通讯作者:
A. Kulikov
中科院分区:
文献类型:
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作者:
Evgeny Demenkov;A. Kulikov
A Boolean function f: F2n → F2 is called an affine disperser of dimension d, if f is not constant on any affine subspace of F2n of dimension at least d. Recently Ben-Sasson and Kopparty gave an explicit construction of an affine disperser for sublinear d. The main motivation for studying such functions comes from extracting randomness from structured sources of imperfect randomness. In this paper, we show another application: we give a very simple proof of a 3n-o(n) lower bound on the circuit complexity (over the full binary basis) of affine dispersers for sublinear dimension. The same lower bound 3n-o(n) (but for a completely different function) was given by Blum in 1984 and is still the best known.
The main technique is to substitute variables by linear functions. This way the function is restricted to an affine subspace of F2n. An affine disperser for sublinear dimension then guarantees that one can make n - o(n) such substitutions before the function degenerates. It remains to show that each such substitution eliminates at least 3 gates from a circuit.
DOI:
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发表时间:
2007
期刊:
影响因子:
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作者:
天野一幸;垂井淳;トンプラチュム・アクサラ;垂井 淳
通讯作者:
垂井 淳