摘要
本文利用自然数的最小性性质，给出数学归纳法的合理性及数学归纳法条件1与条件2的相互依赖关系。
With the use of the minimum nature the paper comments the reasonableness and the mutual relation of dependence in Condition one and Two of mathematic induction.
关键词
数学归纳法
自然数
命题
mathematic induction, natural number
proposition
