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We examine several belief change operations in the light of Dynamic Logic of Propositional Assignments DL-PA. We show that we can encode in a systematic way update operations (such as Winslett's `Possible Models Approach') and revision operations (such as Dalal's) as particular DL-PA programs. Every DL-PA formula being equivalent to a boolean formula, we obtain syntactical counterparts for all these belief change operations.

belief change; update; revision; dynamic logic; propositional assignment