在数学命题里,命题由题设和结论构成,常写成“若p则q”或“p→q”的形式。其中命题p叫做命题的条件或题设;命题q叫做命题的结论。命题还有四种:原命题、否命题或逆否命题。要判断某个数学命题“p→q”的真假,常采用的证明方法有直接证法、间接证法和数学归纳法。多数命题的证明采用直接 In mathematical propositions, propositions consist of inscriptions and conclusions, often written as “if p then q” or “p → q”. Which proposition p is called the conditions or propositions; Proposition q is called the proposition conclusion. There are four propositions: the original proposition, no proposition or inverse proposition. To determine a mathematical proposition “p? Q ” true and false, often used to prove the method of direct evidence, indirect evidence and mathematical induction. Proof of most propositions is direct