Discontinuous derivative.
24449
How discontinuous can a derivative be?
115712
Application of Derivatives rigorous proof
17223
Continuity of an inverse function.
96022
Symmetry of second derivative - Sufficiency of twice-differentiability
108593
First order weak derivatives of $f(x)=|x|^r$
123602
Non integer derivative of $1/p(x)$
35671
Why can a discontinuous function not be differentiable?
87131
Discontinuous at rationals and differentiable at irrationals?
130586
$f$ is discontinuous $\iff$ kernel($f$) is dense in X
105398
Physical intuition for higher order derivatives
79822
Problems with partial derivatives.
112898
Derivative of sin(x)/x at $0$ by definition of derivative
88854
Simple way to understand what derivative is
117338
Counterexample to second derivative test when f''(x) is not continuously differentiable
107609
Function whose third derivative is itself.
66639
Second Derivative
78687
Integral with a discontinuity point