Enumeration of monadic second-order queries on trees

Enumeration of monadic second-order queries on trees
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树上一元二阶查询的枚举

DOI:
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发表时间:
2013
期刊:
TOCL
影响因子:
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通讯作者:
L. Segoufin
L. Segoufin
中科院分区:
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文献类型:
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作者:
Wojciech Kazana;L. Segoufin

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本文研究树上一阶自由变量的一元二阶查询的枚举问题。在Bagan [2006]中,证明了这个问题存在于常数延迟中。一个枚举问题属于常数-延迟,如果对于一个大小为n的输入结构,它可以通过以下方式解决: - O(n)预计算阶段,构建索引结构, - 随后是枚举答案的阶段,没有重复,两个连续输出之间有恒定的延迟。 本文基于Colcombet [2007]的确定性因子分解森林分解定理给出了这个结果的一个不同的证明。
We consider the enumeration problem of Monadic Second-Order (MSO) queries with first-order free variables over trees. In Bagan [2006] it was shown that this problem is in CONSTANT-DELAYlin. An enumeration problem belongs to CONSTANT-DELAYlin if for an input structure of size n it can be solved by: —an O(n) precomputation phase building an index structure, —followed by a phase enumerating the answers with no repetition and a constant delay between two consecutive outputs. In this article we give a different proof of this result based on the deterministic factorization forest decomposition theorem of Colcombet [2007].