How to prove the set $\{\cos(n) \mid n \in \mathbb{N}\}$ is dense in $[-1,1]$
17461
Show that a set is dense in $[-1,1]$
67244
Why is $L^1(\mathbb{R}^n) \cap L^2(\mathbb{R}^n)$ dense in $ L^2(\mathbb{R}^n)$?
151719
Connected set in $\mathbb{S}^1$
46698
Showing a set is closed under inverses
29965
Proving that $m+n\sqrt{2}$ is dense in $\mathbb R$
80559
In $C[0,1]$ prove that the subset of Lipschitz functions is dense
73338
Prove that the closure of complement, is the complement of the interior
17067
To prove that $(\mathbb{P(N)},d)$ is a metric space
15344
Let $a_n=\cos(a_{n-1}), L=[a_1,a_2,...,a_n,...].$ Is there an $a_0$ such that $L$ is dense in$[-1,1]?$
70164
Proof exercise that the cardinal number of a set in $\mathbb R^2$ is $\frak c$
115625
Intersection of two open dense sets is dense
110876
Prove that $p\mid \binom{p}{k},\ 0< k< p$
51514
Is $n \sin n$ dense on the real line?
129205
A question about uncountable, dense sets in R
44430
Is there an open dense set $S \subset [0,1]$ such that $m(S)<1$?
158011
$C_c^{\infty}(\mathbb R^n)$ is dense in $W^{k,p}(\mathbb R^n)$
81150
Positive integer multiples of an irrational mod 1 are dense