作者PttFund (批踢踢基金)
看板Math
标题[分析] 高微(2)
时间Mon Jul 11 22:18:01 2005
Let f : R -> R be differentiable and there is a constant c > 0
such f'(x)≧c for all x. Show that there exists x_0 in R such
that f(x_0)=0.
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