Abstract
The paper analyzes dynamic epistemic logic from a topological perspective. The main contribution consists of a framework in which dynamic epistemic logic satisfies the requirements for being a topological dynamical system thus interfacing discrete dynamic logics with continuous mappings of dynamical systems. The setting is based on a notion of logical convergence, demonstratively equivalent with convergence in Stone topology. Presented is a flexible, parametrized family of metrics inducing the latter, used as an analytical aid. We show maps induced by action model transformations continuous with respect to the Stone topology and present results on the recurrent behavior of said maps.
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Notes
- 1.
\(\varvec{\mathcal {L}_{\varLambda }}\) is isomorphic to the domain of the Lindenbaum algebra of \(\varLambda \).
- 2.
- 3.
- 4.
A logic \(\varLambda \) is logically compact if any arbitrary set A of formulas is \(\varLambda \)-consistent iff every finite subset of A is \(\varLambda \)-consistent.
- 5.
An \(\varvec{\mathcal {L}}_{\varLambda }\) modal space \(\varvec{X}\) is saturated iff for each \(\varLambda \)-consistent set of formulas A, there is an \(\varvec{x}\in \varvec{X}\) such that \(x\vDash A\). Saturation relates to the notion of strong completeness, cf. e.g. [14, Proposition 4.12]. See [31] for its use in a more general context.
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- 7.
The precondition of \(\sigma \) specify the conditions under which \(\sigma \) is executable, while its postcondition may dictate the posterior values of a finite, possibly empty, set of atoms.
- 8.
I.e. a conjuction of literals, where a literal is an atom or a negated atom.
- 9.
Or \(\omega \)-limit point. The \(\omega \) is everywhere omitted as time here only moves forward.
- 10.
We paraphrase van Benthem and Sadzik using the terminology introduced.
- 11.
See [16] for an elegant and generalizing exposition.
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- 14.
- 15.
A similar argument shows that all \(x^{Z}\) with \(Z\subseteq \mathbb {N}\) co-infinite are recurrent points. Hence \(\omega _{f}(\varvec{x}'_{k})\) for any \(\varvec{x}'_{k}\in (\varvec{x}'_{n})_{n\in \mathbb {N}_{0}}\) contains uncountably many recurrent points.
- 16.
- 17.
In the omitted part of the quotation from the introduction.
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Acknowledgements
The contribution of R.K. Rendsvig was funded by the Swedish Research Council through the Knowledge in a Digital World project and by The Center for Information and Bubble Studies, sponsored by The Carlsberg Foundation. The contribution of D. Klein was partially supported by the Deutsche Forschungsgemeinschaft (DFG) and Grantová agentura České republiky (GAČR) as part of the joint project From Shared Evidence to Group Attitudes [RO 4548/6-1].
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Klein, D., Rendsvig, R.K. (2017). Convergence, Continuity and Recurrence in Dynamic Epistemic Logic. In: Baltag, A., Seligman, J., Yamada, T. (eds) Logic, Rationality, and Interaction. LORI 2017. Lecture Notes in Computer Science(), vol 10455. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-55665-8_8
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