Sunday, 16 November 2014

calculus - Uniform Continuity and Differentiation

Is the following true or false?:




Let f:[0,1)R be a function differentiable in [0,1) (where the derivative at zero means "right derivative") such that both f and f are uniformly continuous in (0,1). Then f is continuous.




Note that the mistery lies at x=0. So the question is: can we say with these hypotheses that f(0)=limx0+f(x) (which exists thanks to the uniform continuity of f(0,1)). Note also that the uniform continuity of f(0,1) makes redundant the analogous requirement for f (which will even more become a Lipschitz function).

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