Codensity Games for Bisimilarity

Codensity Games for Bisimilarity
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相似性的代码密度游戏

DOI:
10.1007/s00354-022-00186-y
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发表时间:
2022
影响因子:
2.6
通讯作者:
Hasuo Ichiro
Hasuo Ichiro
中科院分区:
计算机科学4区
文献类型:
--
作者:
Komorida Yuichi;Katsumata Shin-ya;Hu Nick;Klin Bartek;Humeau Samuel;Eberhart Clovis;Hasuo Ichiro

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Bisimilarity as an equivalence notion of systems has been central to process theory. Due to the recent rise of interest in quantitative systems (probabilistic, weighted, hybrid, etc.), bisimilarity has been extended in various ways, such as bisimulation metric between probabilistic systems. An important feature of bisimilarity is its game-theoretic characterization, where Spoiler and Duplicator play against each other; extension of bisimilarity games to quantitative settings has been actively pursued too. In this paper, we present a general framework that uniformly describes game characterizations of bisimilarity-like notions. Our framework is formalized categorically using fibrations and coalgebras. In particular, our characterization of bisimilarity in terms of fibrational predicate transformers allows us to derive what we call codensity bisimilarity games: a general categorical game characterization of bisimilarity. Our framework covers known bisimilarity-like notions (such as bisimulation metric and bisimulation seminorm) as well as new ones (including what we call bisimulation topology).
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