五、非精确推理 1.引言我们知道,值仅为真或假的命题称为必然命题,用必然命题进行的推理称为精确推理;值介于真假之间的命题称为似然命题,用似然命题进行的推理称为似然推理或非精确推理. 人类的绝大多数推理活动是不精确的,这种不精确性体现为由前提的不精确导致结论的不精确性.例如:在日常生活中,经常会遇到一类问题,天有不测风云,今天晴转多云,风力3～5级,明 V. Inaccurate reasoning 1. Introduction We know that propositions whose value is only true or false are called inevitable propositions and reasoning with inevitable propositions is called precise reasoning. Propositions whose value lies between true and false are called likelihood propositions, Reasoning with likelihood propositions is called likelihood reasoning or inaccurate reasoning Most human reasoning activities are inaccurate, and inaccuracies such as inaccuracies in the imprecision of the premise result in inaccuracies in the conclusions: In daily life, we often encounter a type of problem. There are unpredictable events. Today, the weather turns cloudy with winds of 3 to 5