Are there star-convex small exotics $R^4 \subset \mathbb{R}^4$?
113915
A star shaped open set in $\mathbb{R}^n$ is diffeomorphic to $\mathbb{R}^n$
6335
Proving that the set enclosed by an ellipse is convex
155669
$\mathrm{Aut}(D_4)$ is isomorphic to $D_4$
115224
Equivalences of $\diamondsuit$-principle.
118564
Dual cone of a $L^1$ norm cone?
29453
An epimorphism from $S_{4}$ to $S_{3}$ having the kernel isomorphic to Klein four-group
80186
How to show that $K\leq S_4$ is a normal subgroup?
18334
Equivalence between CH and existence of certain sets in $\mathbb{R}^2$
129465
Minimizing Frobenius norm of a special type
16860
set of almost complex structures on $\mathbb R^4$ as two disjoint spheres
48490
Examples of $f$ strictly convex, either with one minimizer or with no minimizer.
66272
Is there a common notion of $\mathbb{R}^n$, for non-integer $n$?
82474
Isometries of $\mathbb{R}^n$
33527
Star convex set is simply connected.
8255
Real polynomials from repunits to repunits ( Putnam 2007 A4)
90826
Constructing a subset not in $\mathcal{B}(\mathbb{R})$ explicitly
3307
Find a function in $L^p(\mathbb{R})$ only for $p=4$