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Thread: no differentiable function

  1. January 9th 2010, 07:36 AM #1
    flower3
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    no differentiable function

    Prove that there is no differentiable function f:[-1,1] \to \mathbb {R} such that f'(x)=[x]
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  2. January 9th 2010, 07:42 AM #2
    Shanks
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    Hint:Applying Darboux's theorem! If the statement is true, then it leads to cantradiction to Darboux's theorem.
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