推 dorminia :微分中值定理用兩次 05/16 00:04
推 wickeday :第一次其實可以用MVT拉 05/16 00:07
f twice differentiable on (a,b)
there are point x1<x2<x3 in (a,b) such that f(x1)>f(x2) f(x3)>f(x2)
prove that exist point c in (a,b) such that f''(c) > 0
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