Subgroup generated by $\sqrt2$ is dense in $[0,1]$.
115851
Why is this quotient space not Hausdorff?
90590
Prove that the following set is dense
48369
discrete subgroups of euclidean space
44165
the image of normal subgroups
158011
$C_c^{\infty}(\mathbb R^n)$ is dense in $W^{k,p}(\mathbb R^n)$
142938
Sylow 2-subgroups of the group $\mathrm{PSL}(2,q)$
17461
Show that a set is dense in $[-1,1]$
149578
Subgroups of $(\mathbb Z_n,+)$
80559
In $C[0,1]$ prove that the subset of Lipschitz functions is dense
79144
Prove that the orbit of an iterated rotation of 0 (by (A)(Pi), A irrational) around a circle centered at the origin is dense in the circle.
106277
Prove that $G$ contains a subgroup $H_i$ for each $i\in\Bbb Z$ with $\dots\subset H_{−2}\subset H_{−1}\subset H_0\subset H_1\subset\dots?$
74498
Smallest dense subset of $\mathbb{R}$
95294
Dense subset of $C[0,1]$ which preserves rationals
50934
Let $x_n \in[0,1)$ s.t $x_n - \sqrt{n}\in \mathbb{Z}$. Prove that $X=\{x_n | n\in \mathbb{N}\}$ is dense in $[0,1]$.
67244
Why is $L^1(\mathbb{R}^n) \cap L^2(\mathbb{R}^n)$ dense in $ L^2(\mathbb{R}^n)$?
75568
Subgroup of index $2$ is Normal
128652
Subgroups of $\mathbb Z \times(\mathbb Z/n\mathbb Z)$