Finally, we prove the frame completeness of DEC1 with respect to the frame conditions as well.

最后，我们证明DEC1相对这些框架条件也是框架完全的。

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Firstly, we construct the dynamic epistemic conditional system DEC1, give some results of its proof theory.

首先，我们构造动态认知条件句系统DEC1，给出它的一些证明论结果。

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Secondly, we introduce the order neighborhood semantics, give the frame conditions of the character axioms and rules of DEC1, prove the frame soundness of DEC1 with respect to the frame conditions.

其次，我们引入有序邻域语义，给出描述DEC1的特征公理和规则的框架条件，证明DEC1相对这些框架条件是框架可靠的。

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