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  1. MHB Master
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    Euge's Avatar
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    #1
    Here is this week's POTW:

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    Suppose $f : (a,b) \to \Bbb R$ is a convex function. Show that $f$ is differentiable at all but countably many points and the derivative is nondecreasing.

    -----

    Remember to read the "POTW submission guidelines to find out how to "submit your answers!

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