Reachability problems in low-dimensional nondeterministic polynomial maps over integers

Reachability problems in low-dimensional nondeterministic polynomial maps over integers
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整数上的低维非确定性多项式映射的可达性问题

DOI:
10.1016/j.ic.2021.104785
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发表时间:
2021
影响因子:
1
通讯作者:
Ko S
Ko S
中科院分区:
计算机科学4区
文献类型:
--
作者:
Ko S

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我们研究了Z n中各种非确定多项式映射的可达性问题。我们证明了非常简单的三维仿射映射(独立变量)的可达性问题是不可判定的,是PSPACE困难的二维仿射映射和一维二次映射。然后我们证明了不含形式为±x+ a 0的函数的映射的可达性问题的复杂性较低。在这种情况下,可达性问题对于任何维度都是PSPACE,如果维度不固定,则问题是PSPACE完全的。最后,我们扩展了模型,考虑地图作为语言受体,并证明了普遍性问题是不可判定的二维仿射映射。
We study reachability problems for various nondeterministic polynomial maps in Z n. We prove that the reachability problem for very simple three-dimensional affine maps (with independent variables) is undecidable and is PSPACE-hard for both two-dimensional affine maps and one-dimensional quadratic maps. Then we show that the complexity of the reachability problem for maps without functions of the form±x+ a 0 is lower. In this case the reachability problem is PSPACE for any dimension and if the dimension is not fixed, then the problem is PSPACE-complete. Finally we extend the model by considering maps as language acceptors and prove that the universality problem is undecidable for two-dimensional affine maps.
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