作者andybbbb (小威)
看板trans_math
标题[微分] 急问这一题，星期一要考考了
时间Sun Nov 13 04:02:15 2005
(a) Suppose that |f(x)| ≦X^2 for all x. Show that f is differentiable at 0.
(b) Suppose that g(0)=0 and |g(x)| ≧ √|x| for all x. Show that g can not be differentiable at 0.
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