Must the derivative at a point be finite when it exists?
68752
A few questions about infinite derivative.
24449
How discontinuous can a derivative be?
158407
derivative bounded by a constant multiple of the function
117338
Counterexample to second derivative test when f''(x) is not continuously differentiable
55125
Continuous right derivative implies differentiability
6957
Wavefunction and its derivative vanish at same point
20218
Is this field extension finite?
90892
Is a function increasing if the derivative is positive except at one point of an interval?
973
Is the property "being a derivative" preserved under multiplication and composition?
43681
When does the normality of the family of derivatives imply that the family itself is normal?
11017
Does existence of partial derivatives implies continuity at a point $(x_0,y_0)$?
25482
If a function is continuous and differentiable everywhere is the derivative continuous?
11167
A counterexample of a differentiable function on an interval whose derivative is discontinuous
150833
Discontinuities of the derivative of a differentiable function on closed interval
41557
Most general $A \subseteq \mathbb R$ to define derivative of $f: A \to \mathbb R$?
38192
Derivative of inverse function at a point.
154572
Continuity of a function at an isolated point