Neighborhood of a differentiable function
53767
How to prove that derivatives have the Intermediate Value Property
106013
Given $f(x) = x + |x|$ for what values of $x$ is $f$ differentiable
42900
Locally continuously differentiable implies locally Lipschitz
85623
Proof of continuity implied by differentiability
150833
Discontinuities of the derivative of a differentiable function on closed interval
113888
Behavior of derivative near the zero of a function.
151171
Distance of nearest zero of an analytic function
68973
Is the determinant differentiable?
110219
Bound on the derivative of a holomorphic function at $0$
111470
Proof of differentiability of $f(x)$
143491
Show that $f$ is differentiable on $(−1, 1)$.
150373
Number of Fixed Point(s) of a Differentiable Function
47688
Number of roots of differentiable function
135941
Derivative of $|x|^\alpha$
55268
Differentiable and Continuous functions on [0,1] with 'weird' conditions.
31685
Differentiability of $f(x) = x^2 \sin{\frac{1}{x}}$ and $f'$
124861
The extension of smooth function