P-推理(packet reasoning)是由p-集合(packet sets)的结构与动态特征得到的.P-推理由内P-推理(internal packet reasoning)与外P-推理(outer packet reasoning)构成,具有动态特性与“序”特性.对P-推理进行“反序”研究,得到倒向P-推理(backward packet reasoning).倒向P-推理由倒向内P-推理(backward internal packet reasoning)和倒向外P-推理(backward outer packet reasoning)构成.倒向P-推理的特征是:利用推理条件中集合的变化,在推理结论中找到变化的属性集合.利用倒向P-推理,给出P-属性类、P-属性类特征、P-属性类发现-辨识以及P-属性类在信息系统中的应用.%P-reasoning( packet reasoning) is obtained by the structure and dynamic characteristic of P-sets. P-reasoning is composed of internal P-reasoning( internal packet reasoning) and outer P-reasoning (outer packet reasoning), which has the dynamic characteristic and "sequence" characteristic. Backward P-reasoning(backward packet reasoning) is presented by the "opposite sequence" study for P-reasoning. Backward P-reasoning is composed of backward internal P-reasoning and backward outer P-reasoning. The characteristic of backward P-reasoning is to find the attribute set changed in the reasoning conclusion using the change of the element set in the reasoning condition. Using backward P-reasoning, the paper gave P-attribute class, the characteristic and disco very-identification of P-attribute class characteristic, the application of P-attribute class in the information system.
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