论命题推理前提假值的先舍后取——兼及命题推理有效必然性的理论阐释

Why falsity valne in propositional inference premises is fivst rejected and then chosen ——A theoretical interpvetation of effective

推理的目的在于使前提的真传递到结论 ,因而必须舍去前提中的假值。结论是以扩大断定范围的方式必然地保有前提的真。在验证推理是否有效时 ,将前提的真与假值均考虑在内 ,看结论是否完全包含了前提断定的事态 (真 ) ,以确定推理是否必然有效。

the aim of inference is to convey the truth to the conclwsion so the falsity valne in the premises mnst be rejected,Condnsion is to conserve the trath in the premise in way to enlarge the judgenent sde.to testify the effectivity of the inference,truth and falsity vodnes in the premise are both taken in to consideration to see whether the comclusion completely includes the truth in the pemise so that the necessarg effectivity of the inference is accertained.