On the basis of the AGM theory and kernel contraction, this thesis mainly discusses the theory of belief contraction in which new information is a general set of sentences.
本文在AGM理论和单核收缩的基础上，讨论了被收缩的对象是一般语句集合的信念收缩理论。
On the basis of the AGM theory and kernel contraction, this thesis mainly discusses the theory of belief contraction in which new information is a general set of sentences.
本文在AGM理论和单核收缩的基础上，讨论了被收缩的对象是一般语句集合的信念收缩理论。
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