A New Rank Technique for Formula Size Lower Bounds
A New Rank Technique for Formula Size Lower Bounds
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公式大小下限的新排序技术
DOI:
10.1007/978-3-540-70918-3_13
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发表时间:
2007
期刊:
影响因子:
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通讯作者:
Troy Lee
中科院分区:
文献类型:
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作者:
Troy Lee
We introduce a new technique for proving formula size lower bounds based on matrix rank. A simple form of this technique gives bounds at least as large as those given by the method of Khrapchenko, originally used to prove ann2lower bound on the parity function. Applying our method to the parity function, we are able to give an exact expression for the formula size of parity: ifn= 2ℓ+k, where 0 ≤k< 2ℓ, then the formula size of parity onnbits is exactly 2ℓ(2ℓ+ 3k) =n2+k2ℓ−k2. Such a bound cannot be proven by any of the lower bound techniques of Khrapchenko, Nečiporuk, Koutsoupias, or the quantum adversary method, which are limited byn2.