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微积分复习2
2022-06-12 02:32:00 【樱木之】
第二讲 数列极限
本系列文章参考自《张宇高数18讲》,为了对高等数学微积分的知识进行总结而书写,本系列文章分为18个小节,本节目录见下:
- 导学
- 数列极限的定义及使用
- 数列极限的存在性与计算
下文将根据以上内容进行讲解
refer:
- 《张宇高数18讲》
1 导学

2 数列极限的定义及使用
2.1 定义
数列极限的定义相当于函数趋向于无穷时候的定义。
2.2 使用(极限存在的性质)

数列极限存在后的性质和函数极限存在的性质,第五条不一样,所有子列均收敛于A。
3 数列极限的存在性与计算
3.1 计算
3.1.1 归结原则
即当数列极限xn存在时,将xn作为自变量带入f(xn)中,如果f(x)在特定点x0的极限存在,则可以使用归结原则将数列极限转换为函数极限计算。
3.1.2 直接计算法
先用单调有界准则证明,n趋向于无穷时,xn的数列极限存在。则令xn+1=xn=a,带入a解得a。则a即为数列极限。
3.1.3 定义法
构造后放缩。
3.2 证明
3.2.1 单调有界准则

3.2.2 夹逼准则

3.3 综合题
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