对当关系直接推理外延的再扩展

Re-expanding on the Immediate Inference of Equivalent Relation

目前,人们对对当关系直接推理的研究,主要是同素材的性质命题、模态命题、规范命题以及复合命题间的对当关系直接推理,而相同素材的性质命题与其负命题间尚未涉及。事实上,根据相同素材的性质命题与其负命题间对当关系也能进行有效的直接推理。

At present, the discussion on the immediate inference of equivalent relation is mainly in nature propositions by identical original material, modal propositions, normal propositions and complex propositions. None touched upon nature propositions by identical original material and their negative propositions. In fact, based on the equivalent relation of nature proposition by identical original material and their negative proposition, we can deduce effective immediate inference.