学习过程中,我们经常试图判断一般性命题的真假,往往是通过推理论证验证命题的正确性,而通过反例来驳斥这个命题.何为反例?为说明一个命题是假命题而举出的使之具备命题的条件,而不具有命题的结论的例子称为反例.通过反例,可以使我们认识到事物的本质属性,帮助我们从正反两方面辩证地思考问 In the learning process, we often try to judge the true propositions of general propositions by verifying the correctness of the propositions by reasoning and arguing, and refuting the proposition by counterexamples. What is the counter-example? To illustrate that a proposition is a false proposition, The propositions of the conditions, but not the proposition of the conclusion of the example is called counterexamples.With counterexamples, we can make us recognize the nature of things, help us to think dialectically from both positive and negative