Convexity of range set of a twice continuously differentiable function with convex domain
28637
Proving continuous image of compact sets are compact
15645
Is convex open set in $\mathbb{R}^n$ is regular?
40438
Proving that closed (and open) balls are convex
143936
Show that $f(x)=||x||^p, p\ge 1$ is convex function on $\mathbb{R}^n$
129324
Let $f:[0;1]\to\mathbb R$ be continiously differentiable
123519
Fréchet differentiability from Gâteaux differentiability
17336
Least norm in convex set in Banach space
16463
Is the function $\mbox{tr}(XAX')$ convex?
77624
Characterization of sets of differentiability
115814
If $\operatorname{Re}f^\prime > 0$ on a convex domain, then $f$ is one-to-one.
115930
Is every convex function on an open interval continuous?
86643
Convex function almost surely differentiable.
15491
Prove that $f:\mathbb R^n\to\mathbb R$ is affine if and only if it is convex and concave
60556
Uniform convergence, Bounded derivative.
96022
Symmetry of second derivative - Sufficiency of twice-differentiability
153798
Problem involving maximum and minimum of a continuous function
54600
Is a convex and lower semicontinuous function defined on a closed and convex subset of $\mathbb{R}^n$ continuous?