反证法一例许智应用反证法证明数学命题时一般分下面几个步骤：第一步：分清命题“若Ａ则Ｂ”的条件与结论。第二步：作出与命题结论Ｂ相矛盾的假定Ｂ。第三步：由Ａ和Ｂ出发，应用正确的推理方法，推出矛盾结果。第四步：断定产生矛盾结果的原因，在于开始所作的假定Ｂ不... A case of anti-evidence law Xu Zhi’s use of anti-evidence methods to prove mathematical propositions is generally divided into the following steps: Step 1: Distinguish the conditions and conclusions of the proposition “If A then B”. Step 2: Make an assumption B that contradicts the conclusion B of the proposition. Step 3: Starting from A and B, apply the correct reasoning method and introduce contradictory results. Step 4: Determine the cause of the conflicting result. Start with the assumption that B does not...