Belief Revision in a Multi-Agent environment Recoverability vs. Priority to the Incoming Information

this paper is that, to be applied in a multi-sources environment, belief revision has to depart considerably from the original framework. In particular, it has to abandon the fundamental principle of "Priority to the Incoming Information" in force of what we called the principle of "Recoverability". A BRIEF RETROSPECTIVE Alchourrón , Gärdenfors and Makinson [1] introduced three rational principles to whom belief revision should obey: P1. Consistency: belief revision must yield a consistent knowledge space P2. Minimal Change: belief revision should alter as little as possible the knowledge space P3. Priority to the Incoming Information: incoming information always belongs to the revised knowledge space They conceived the knowledge space K as a deductively closed set of sentences of a propositional language L. From P1÷P3 they drew up eight postulates for the revision