Definition: In mathematics, a function is said to be differentiable at a point if its derivative at that point exists and is equal to the value of the function at that point. However, this definition does not define what it means for a function to be "undifferentiable". Undifferentiability refers to the behavior of a function as it approaches zero from an infinite distance, where the derivative becomes undefined or vanishes. In other words, if there is no limit to the value of the function at any
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