Hi, How would I go about formally proving that a continuous equation e.g. y=|x| is non-differentiable at a point such as x=0? I know what it looks like graphically with a sharp edge but how would the proof look like algebraically?
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Originally Posted by Plato Show that Wouldn't they both converge to 0 on both sides of the curve?
Originally Posted by Kataangel Wouldn't they both converge to 0 on both sides of the curve? Neither of those limits is zero.
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