数学之家
标题:
等价无穷小代换定理
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作者:
castelu
时间:
2017-11-8 18:42
标题:
等价无穷小代换定理
定理
设函数$f$,$g$,$h$在$U^\circ \left( x_0 \right)$内有定义,且有
$$f\left( x \right) \sim g\left( x \right)\left( x \to x_0 \right)$$
(i)若$\lim\limits_{x \rightarrow x_0}f\left( x \right)h\left( x \right) = A$,则$\lim\limits_{x \rightarrow x_0}g\left( x \right)h\left( x \right) = A$;
(ii)若$\lim\limits_{x \rightarrow x_0}\frac{h\left( x \right)}{f\left( x \right)} = B$,则$\lim\limits_{x \rightarrow x_0}\frac{h\left( x \right)}{g\left( x \right)} = B$。
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