- (2.4)James Stewart Calculus 5th
- (10.3)James Stewart Calculus 5th
- (11.1)James Stewart Calculus 5th
- (10.5)James Stewart Calculus 5th
- (10.6)James Stewart Calculus 5th
- (10.2)James Stewart Calculus 5th
- (10.4)James Stewart Calculus 5th
- (11.2)James Stewart Calculus 5th
- (10.1)James Stewart Calculus 5th
- (8.4)James Stewart Calculus 5th
The Precise Definition of a Limit 极限的精确定义
前面一个简单的,略
定理2
Let be a function defined on some open interval that contains the
number a, except possibly at a itself. Then we say that the limit of f(x) as x
approaches a is L
![](https://img.haomeiwen.com/i2800913/e87802e7cfde99cf.png)
后面是 经典的叙述(记得大学,epsilon【ε】,delta【δ】 这段话都快背疯了)
- 在一个区间内,对于每一个ε>0,都存在一个δ>0,使得 ......
另一个写法:
![](https://img.haomeiwen.com/i2800913/81623f8a10790358.png)
对应的理解为:
![](https://img.haomeiwen.com/i2800913/a92879b807ec439d.png)
简单例子
![](https://img.haomeiwen.com/i2800913/d8a6451e859ded1b.png)
解题过程:
- 简单分析
![](https://img.haomeiwen.com/i2800913/8f32b68520b958ce.png)
- 最后选取 δ = ε/4
![](https://img.haomeiwen.com/i2800913/416c2fb2de9c9858.png)
- 证明过程
![](https://img.haomeiwen.com/i2800913/228faa487ca9e832.png)
对于给的 ε>0, 存在 δ = ε/4 ,
如果当 ....., 有 ...,
所以 无论... 都有...
Definition of Left-Hand(Right-Hand) Limit 左右极限的定义
![](https://img.haomeiwen.com/i2800913/786e4a97049f5db0.png)
求和定律的证明
![](https://img.haomeiwen.com/i2800913/69a51581730e9500.png)
Infinite Limits 无穷大
正无穷大的定义
![](https://img.haomeiwen.com/i2800913/3794c82ff1bbea70.png)
对应的负无穷大的
![](https://img.haomeiwen.com/i2800913/60a17afbe1b5364f.png)
证明小例子
![](https://img.haomeiwen.com/i2800913/686be623fde3fff4.png)
- 简单分析
![](https://img.haomeiwen.com/i2800913/a5911c14eefa47ce.png)
- 证明
![](https://img.haomeiwen.com/i2800913/7a5e6ee2290404c7.png)
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