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Functions AhmadBalkhi 04/26/03
    denotation:
    let x1 el (x-n, x+n) represent x1 is element of an open interval (x-n, x+n)
    Let f be a function.

    Suppose f is continuous at x and that f(x)>0.
    Proof that there is a positive real number m and n such that if x1 el (x-n, x+n) then, f(x)>m

    Thanks

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