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luo bi da fa ze de ling yi zheng ming
Author(s): 
Pages: 17
Year: 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x0与a之间)有,即 (1) 又对上述的x0与,f(x)在[x0,x]或[x,x0]满足柯西中值定理的条件,根据柯西中值定理介于x0与x之间)有:
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