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arXiv 2205.02149cs.CCmath.AG
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度限制强度分解与代数分支规划

Degree-restricted strength decompositions and algebraic branching programs

Fulvio Gesmundo, Purnata Ghosal, Christian Ikenmeyer, Vladimir Lysikov

摘要:

我们分析了Kumar最近的二次代数分支程序大小下限证明方法(CCC 2017)。我们提出了一种改进的方法,在某些情况下,提供更好的界限。下界依赖于由齐次多项式定义的超曲面上的Noether-Lefschetz型条件。在我们提供的显式例子中,借助于经典的交集理论证明了下界。此外,我们使用类似的方法,以改善已知的下限方法的切片秩的多项式。我们考虑了一系列的多项式,已研究过的Shioda,并表明,这些多项式的改进的下限匹配已知的上限。

英文摘要:

We analyze Kumar's recent quadratic algebraic branching program size lower bound proof method (CCC 2017) for the power sum polynomial. We present a refinement of this method that gives better bounds in some cases. The lower bound relies on Noether-Lefschetz type conditions on the hypersurface defined by the homogeneous polynomial. In the explicit example that we provide, the lower bound is proved resorting to classical intersection theory. Furthermore, we use similar methods to improve the known lower bound methods for slice rank of polynomials. We consider a sequence of polynomials that have been studied before by Shioda and show that for these polynomials the improved lower bound matches the known upper bound.

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