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Author:
Journal / Book Title:
Year:
Volume:
Issue:
luo bi da fa ze de ling yi zheng ming
Author(s):
LI Peilu
,
HAN Yonghua
Pages:
17
Year:
1994
Issue:
2
Journal:
Journal of Puyang College of Education
Keyword:
洛比达法则
;
中值定理
;
证明方法
;
极限定义
;
待定型
;
《数学分析》
;
柯西
;
教材中
;
条件
;
函数
;
Abstract:
<正>《数学分析}教材中,有关∞/∞待定型的洛比达法则的证明,大多采用极限定义法。本文给出较简捷的另一种证明方法。 洛比达法则:若函数f(x)与φ(x)满足下列条件: 1) 在a的某去心领域U(a)可导且φ(x)≠0 2); 3); 则:。 证明:由条件3):(x介于x
0
与a之间)有,即 (1) 又对上述的x
0
与,f(x)在[x
0
,x]或[x,x
0
]满足柯西中值定理的条件,根据柯西中值定理介于x
0
与x之间)有:
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