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arXiv 2005.02384cs.LO
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MSO +U逻辑的组合性

Compositionality of the MSO+U Logic

Paweł Parys

摘要:

我们证明了MSO+U逻辑在以下意义上是合成的:MSO+U公式在树T中是否成立仅取决于T的根和T的直接从根下面开始的子树的MSO+ U可定义性质。另一种复合性如下:每个MSO+U公式,其所有自由变量的范围仅在有限的节点集上(特别是,其所有自由变量都是一阶的),可以重写为MSO公式,该MSO公式可以访问由MSO+U语句(没有自由变量)定义的子树的属性。

英文摘要:

We prove that the MSO+U logic is compositional in the following sense: whether an MSO+U formula holds in a tree T depends only on MSO+U-definable properties of the root of T and of subtrees of T starting directly below the root. Another kind of compositionality follows: every MSO+U formula whose all free variables range only over finite sets of nodes (in particular, whose all free variables are first-order) can be rewritten into an MSO formula having access to properties of subtrees definable by MSO+U sentences (without free variables).

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