Iterated Revision Operations Stemming from the History of an Agent’s Observations

摘要: Knowledge bases can be used to represent an agent’s perception of the world. As agent often has deal with incomplete, uncertain or vague information, she revise her beliefs about In order model revision, one provide a mechanism support modification knowledge base in presence new item information. Since revision is central topic representation, it been tackled literature according several points view, symbolic numerical, logical probabilistic. Among approaches, AGM paradigm [Alchourron et al., 1985], which interpreted as change, become standard. Although very elegant, this framework does not iterated because underlying preference relation between lost process change. fact, approach epistemic state represented by set, i.e. deductively closed set sentences language, that represents current beliefs. However, only consist but also encodes strategy uses modify his after learning piece A operator satisfying postulates equivalent pre-orders ≤Ψ, where each pre-order corresponds Ψ and for observation. However total associated two successive states are related, requirement these faithful.