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Putting More Dynamics in Revision with Memory

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Logic, Rationality, and Interaction (LORI 2017)

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Abstract

We have proposed in previous works [14, 15] a construction that allows to define operators for iterated revision from classical AGM revision operators. We called these operators revision operators with memory and show that the operators obtained have nice logical properties. But these operators can be considered as too conservative, since the revision policy of the agent, encoded as a faithful assignment, does not change during her life. In this paper we propose an extension of these operators, that aims to add more dynamics in the revision process.

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Notes

  1. 1.

    See also [22,23,24]. We do not adress this kind of operators in this paper since they require an additional numerical information with the new evidence.

  2. 2.

    The Dalal distance [7] is a Hamming distance between interpretations.

  3. 3.

    Recall that classical AGM operators are functions that map a belief base and a formula to a belief base, which is (completely) defined by the theorem, whereas Proposition 1 concerns operators that are functions which map an epistemic state and a formula to an epistemic state, that is not completely defined by the theorem.

  4. 4.

    It is the same set of postulates than (R*1-R*6) but expressed for belief bases instead of epistemic states (cf [12]).

  5. 5.

    The Hamming distance between two interpretations is the number of propositional letters on which the two interpretations differ.

  6. 6.

    Where \(I\le _{lex(\le _1,\le _2)} J\) means \(I <_{1} J\) or (\(I \simeq _{1} J\) and \(I \le _2 J\)).

  7. 7.

    In that framework, it is a consequence of the other axioms.

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Konieczny, S., Pino Pérez, R. (2017). Putting More Dynamics in Revision with Memory. 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_42

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