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This paper introduces a non-Horn rule
WRM which is a weak form of rational monotony. We explore
the effects of adding this non-Horn rule to the rules for the preferential
inference. In this paper, a relation is said to be P+WRM iff it is a preferential inference and satisfies the rule WRM. We establish the representation theorem for P+WRM, and compare the strength of WRM with some non-Horn rules appearing in
literatures. Moreover, we explore the relation between P+WRM and
conditional logic, and demonstrate that P+WRM is equivalent to 'flat'
fragment of conditional logic CS4.2. Another contribution of this
paper is to explore the relation between two special kinds of preferential
models, I.e., PRC model and quasi-linear model. Main result reveals that
the latter is a special form of the former.
ZHU Zhaohui（朱朝晖），ZHANG Dongmo（张东摩），CHEN Shisu（陈世福）and ZHU Wujia. Some Contributions to Nonmonotonic Consequence[J]., 2001, 16(4): 0-0.
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