摘要:AGM公设是用于信念修正的（被一个单一信念修正），而DP公设是用于迭代修正的（被一个有限的信念序列修正）.李未给出了对于R-构型（configuration）△|Γ的R-演算，其中，△是一个原子公式或原子公式否定的集合，而Γ是一个有限的公式集合.为了在修正过程中能够保留断言中尽可能多的信息，将考虑一种新的极小改变的定义：伪子概念极小改变（≤-极小改变），其中，≤是一种伪子概念的关系；之后，在此基础上给出一种新的R-演算T^DL，它是关于≤-极小改变可靠和完备的，使得△|Γ在T^DL中可以被约减为一个理论△∪Θ（记作├_T^DL △|Γ⇒△，Θ）当且仅当Θ是Γ关于△的一个≤-极小改变.



Abstract:The AGM postulates are for the belief revision (revision by a single belief), and the DP postulates are for the iterated revision (revision by a finite sequence of beliefs). Li gave an R-calculus for R-configurations △|Γ, where △ is a set of atomic formulas or the negations of atomic formulas, and Γ is a finite set of formulas. With an idea to preserve as much as possible information of statements to be revised, another definition of the minimal change is considered:pseudo-subconcept-minimal (≤-minimal) change, where ≤ is the pseudo-subconcept relation, and then give a new R-calculus T^DL which is sound and complete with respect to ≤-minimal change such that △|Γ is reduced to a theory △∪Θ in T^DL (denoted by ├_T^DL △|Γ⇒△,Θ) if and only if Θ is a ≤-minimal change of Γ by △.



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