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arXiv 1605.02494cs.SC
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关于多项式次数的柱形代数分解的复杂性

The complexity of cylindrical algebraic decomposition with respect to polynomial degree

Matthew England, James H. Davenport

摘要:

柱形代数分解(CAD)是处理多项式系统的重要工具,特别是量词消去。然而,它的复杂性在变量的数量上是双指数的。基本算法可以通过适应以利用任何等式约束(EC)来改进:输入逻辑上隐含的等式。直觉上,我们期望复杂度的双指数对于每个EC减少1。在ISSAC 2015中,本文作者证明了这一点,因为复杂度界中的因子取决于输入中多项式的数量。然而,依赖于输入多项式的次数的另一项保持不变。在本文中,作者研究如何在存在EC的CAD可以进一步细化使用Groebner基地的技术,走向直观的多项式次数的界限。

英文摘要:

Cylindrical algebraic decomposition (CAD) is an important tool for working with polynomial systems, particularly quantifier elimination. However, it has complexity doubly exponential in the number of variables. The base algorithm can be improved by adapting to take advantage of any equational constraints (ECs): equations logically implied by the input. Intuitively, we expect the double exponent in the complexity to decrease by one for each EC. In ISSAC 2015 the present authors proved this for the factor in the complexity bound dependent on the number of polynomials in the input. However, the other term, that dependent on the degree of the input polynomials, remained unchanged. In the present paper the authors investigate how CAD in the presence of ECs could be further refined using the technology of Groebner Bases to move towards the intuitive bound for polynomial degree.

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。

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