Prove uniqueness of derivatives.

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- May 6th 2013, 12:13 PMkmay2012Analysis
Prove uniqueness of derivatives.

- May 6th 2013, 02:35 PMHallsofIvyRe: Analysis
What do you mean by that? That if f= g, then df/dx= dg/dx? That could follow from the uniqueness of limits: if f(x)= g(x) for all x (except possibly x= a) then $\displaystyle \lim_{x\to a} f(x)= \lim_{x\to a} g(x)$.