Many people research how to find value of y from resolution proof trees 有许多人研究从归结证明树确定y的值的方法。
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It extracts process information from the proof tree by analyzing every node of resolution proof tree to extract procedure . and the partial correctness of the extracted procedure is proved 这一方法的特点是,抽取算法的时间、空间复杂度都是线性的,并且抽取算法本身十分简单,易于实现。