Construct a real function with is exactly C^2 such that its first derivative does not vanish everywhere
69845
Construct a real function with is exactly $C^2$ such that its first derivative does not vanish everywhere
45363
Show that both mixed partial derivatives exist at the origin but are not equal
96022
Symmetry of second derivative - Sufficiency of twice-differentiability
128911
Continuous extension of a real function
5625
Entire function with vanishing derivatives?
128026
Weak derivatives equals zero
36741
Anti-derivative of continuous function $\frac{1}{2+\sin x}$
26955
Continuous at exactly two points and differentiable at exactly one of them
56827
Functions that are their Own nth Derivatives for Real $n$
113888
Behavior of derivative near the zero of a function.
108593
First order weak derivatives of $f(x)=|x|^r$
107609
Function whose third derivative is itself.
134382
Proving bounded first derivative
91616
Existence of a $C_c^{\infty}$ function $\Phi$ s.t. $\int \nabla \Phi \neq 0.$
75390
How does one prove that if function's partial derivative respect to every variable is zero, function is constant?
85085
Simplifying the derivative of $|x|$
12498
Derivable function on an interval $ [a,b]$ with derivative unbounded on $[a,b]$