arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1302.3308cs.CC
收藏

基于MaxRank的算术电路下界

Arithmetic Circuit Lower Bounds via MaxRank

Mrinal Kumar, Gaurav Maheshwari, Jayalal Sarma M. N

摘要:

我们引入多项式系数矩阵,并确定此矩阵的最大秩变量替换下的多元多项式的复杂性措施。我们使用我们的技术来证明几类非多线性算术电路的超多项式下界。特别是,我们得到了以下结果:作为我们的主要结果,我们证明了任何均匀的深度3电路计算的产品的$d$矩阵的尺寸$n \times n$需要$Ω(n^{d-1}/2^d)$大小。这改进了Nisan和Wigderson(1995)在$d=ω(1)$ .存在关于$n$变量和次数至多$\frac{n}{2}$的显式多项式,对于该多项式,乘积维数至多为$\frac{n}{10}$(馈送到每个乘积门的仿射形式的空间的维数)的任何深度3电路$C$需要大小$2^{Ω(n)}$。这推广了Saxena(2007)证明的对角电路的下界。对角电路的乘积维数为1。证明了乘积稀疏公式的一个$n^{Ω(\log n)}$下界。根据定义,任何多重线性公式都是乘积稀疏公式。因此,我们的结果扩展了Raz(2006)关于多重线性公式大小的已知超多项式下界。本文证明了分块算术分支程序规模的一个$2^{Ω(n)}$下界。这个结果扩展了Jansen(2008)给出的有序算术分支程序的规模的指数下界。

英文摘要:

We introduce the polynomial coefficient matrix and identify maximum rank of this matrix under variable substitution as a complexity measure for multivariate polynomials. We use our techniques to prove super-polynomial lower bounds against several classes of non-multilinear arithmetic circuits. In particular, we obtain the following results : As our main result, we prove that any homogeneous depth-3 circuit for computing the product of $d$ matrices of dimension $n \times n$ requires $Ω(n^{d-1}/2^d)$ size. This improves the lower bounds by Nisan and Wigderson(1995) when $d=ω(1)$. There is an explicit polynomial on $n$ variables and degree at most $\frac{n}{2}$ for which any depth-3 circuit $C$ of product dimension at most $\frac{n}{10}$ (dimension of the space of affine forms feeding into each product gate) requires size $2^{Ω(n)}$. This generalizes the lower bounds against diagonal circuits proved by Saxena(2007). Diagonal circuits are of product dimension 1. We prove a $n^{Ω(\log n)}$ lower bound on the size of product-sparse formulas. By definition, any multilinear formula is a product-sparse formula. Thus, our result extends the known super-polynomial lower bounds on the size of multilinear formulas by Raz(2006). We prove a $2^{Ω(n)}$ lower bound on the size of partitioned arithmetic branching programs. This result extends the known exponential lower bound on the size of ordered arithmetic branching programs given by Jansen(2008).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑