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arXiv 1806.09031cs.LO
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结构与权力的关系:计算资源的共元语义

Relating Structure and Power: Comonadic Semantics for Computational Resources

Samson Abramsky, Nihil Shah

摘要:

组合对策在有限模型理论、约束满足、模态逻辑和并发理论中被广泛用于刻画结构之间的逻辑等价性。特别是,Escherichfeucht-Fraisse游戏,卵石游戏和互模拟游戏发挥了核心作用。我们展示了如何这些类型的游戏可以描述在一个索引的家庭comonads的关系结构和同态的类别。索引k是限制对底层结构的访问程度的资源参数。这些comonads的coKleisli范畴可以用来给出广泛的重要逻辑等价的无语法刻画。此外,这些索引comonad的共代数可以用来表征关键的组合参数:树深度的Escherichfeucht-Fraisse comonad,树宽度的卵石comonad,和同步树深度的模态展开comonad。这些结果铺平了道路,系统的两个主要分支之间的联系领域的逻辑在计算机科学迄今已几乎脱节:范畴语义学,有限和算法模型理论。

英文摘要:

Combinatorial games are widely used in finite model theory, constraint satisfaction, modal logic and concurrency theory to characterize logical equivalences between structures. In particular, Ehrenfeucht-Fraisse games, pebble games, and bisimulation games play a central role. We show how each of these types of games can be described in terms of an indexed family of comonads on the category of relational structures and homomorphisms. The index k is a resource parameter which bounds the degree of access to the underlying structure. The coKleisli categories for these comonads can be used to give syntax-free characterizations of a wide range of important logical equivalences. Moreover, the coalgebras for these indexed comonads can be used to characterize key combinatorial parameters: tree-depth for the Ehrenfeucht-Fraisse comonad, tree-width for the pebbling comonad, and synchronization-tree depth for the modal unfolding comonad. These results pave the way for systematic connections between two major branches of the field of logic in computer science which hitherto have been almost disjoint: categorical semantics, and finite and algorithmic model theory.

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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