三、关于必要条件假言判断教材知识短文说:“所谓必要条件,是指这样一种条件:没有这个条件,就必然没有某种结果,但是有了这个条件时,却不一定有某种结果。”这就是说,要产生某种结果,需要诸多条件合作起来,共同发挥作用才行,缺少任何一个条件都不行,而仅仅具备任何一个条件也不一定行。这种逻辑特性亦可以从正反两个方面概括为“无之必不然,有之未必然”。例如“只有深入生活,才能写出反映现实生活的好作品”这个假言判断,“深入生活”是“写出反映现实生活的好作品”的必要条 Third, the necessary conditions Hypothetical judge textbook knowledge short essay said: “The so-called necessary conditions, refers to such a condition: Without this condition, there will be no certain result, but with this condition, but not necessarily have some result ”That is to say, to produce some kind of result, we need a lot of conditions to work together and work together. If we do not have any one of these conditions, we will not be able to fulfill any of these conditions. This logical characteristic can also be summed up as “inevitable and unimportant” from both positive and negative aspects. For example, the hypothesis that “only in-depth life can write a good work that reflects real life” can be judged as “necessary life in depth” by “writing a good work that reflects real life”