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Math Help - help me please

  1. #1
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    help me please

    Let r > 0 .f: (0)→R and suppose there exists an α >1 such that |f (x)| < for all x Є (0)
    Prove that f is differentiable at 0
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  2. #2
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    Quote Originally Posted by mahmodmg View Post
    Let r > 0 .f: (0)→R and suppose there exists an α >1 such that |f (x)| < for all x Є (0)
    Prove that f is differentiable at 0
    What do you mean by (0)? An open neighborhood of 0? And please specifiy the condition \vert f(x) \vert <
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