子移位、MSO逻辑和折叠层次
Subshifts, MSO Logic, and Collapsing Hierarchies
摘要:
我们使用一元二阶逻辑来定义二维子移位,或无限平面的着色集。我们提出了一个自然的家庭的量词交替层次结构,并表明,他们都崩溃到第三级。特别是,这解决了[Jeandel & Theysier 2013]的一个开放问题。这一结果与图画语言形成了鲜明的对比,图画语言的层次结构通常是无限的。
英文摘要:
We use monadic second-order logic to define two-dimensional subshifts, or sets of colorings of the infinite plane. We present a natural family of quantifier alternation hierarchies, and show that they all collapse to the third level. In particular, this solves an open problem of [Jeandel & Theyssier 2013]. The results are in stark contrast with picture languages, where such hierarchies are usually infinite.
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