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?
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?