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Thursday, November 28, 2013

Question of the week - #1

A question which is addressed to all those studying the fundamentals of differential calculus, and more specifically the definition of the derivative:

"Let a function $f(x)$ which is differentiable (and thus continuous) at a point $x=a$ of its domain. Is the derivative function $f '(x)$ necessarilly continuous at $x=a$ ?"

I am waiting for your ideas and answers.
I will post the solution next week, together with the names of those who will have communicated me correct answers (with proofs or counterexamples!) 

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