Show that f is not differentiable at the origin of the following function.
40429
Differentiability of this picewise function
38923
What can we say about differentiability of $f$ at $c$?
7861
Non-analytic smooth function
62581
What is an example that a function is differentiable but derivative is not Riemann integrable
156839
Functions Which are non differentiable on a Given Set.
158681
How to show that $e^x$ is differentiable?
99726
Proving that a function is not a contraction
135199
Looking for a function $f$ that is $n$-differentiable, but $f^{(n)}$ is not continuous
44761
Is $f'(x)-3f(x) = 0$ subspace of differentiable functions $f\colon (0,1)\to \mathbb{R}$
14994
Showing a function $f$ cannot be surjective
113888
Behavior of derivative near the zero of a function.
97146
differentiate with respect to a function
13150
If the derivative of $f$ is never zero, then $f$ is one-to-one
151575
Differentiable bijection $f:\mathbb{R} \to \mathbb{R}$ with nonzero derivative whose inverse is not differentiable
85092
Proving $ f(x) = x^2 $ is not uniformly continuous on the real line
147758
Differentiable but not continuously differentiable.
63418
Show that $f_n(x) = \frac{x^2}{n}$ for $x \in \mathbb{R}$ does not converge uniformly towards $0$ for $n \rightarrow \infty$