Is this set dense on the positive half of the real line?
48264
Are fractions with prime numerator and denominator dense?
145726
For a subfield $K$ of $\Bbb C$ with $K\nsubseteq \Bbb R$, show $K$ is dense in $\Bbb C$.
64487
Continuous function and dense set
74498
Smallest dense subset of $\mathbb{R}$
118400
Is there a monotonic function discontinuous over some dense set?
113614
Approximating the density of $S\cap[a,b]$ using a Folner Sequence of $A$, where $S \subseteq A$?
128894
About compactness and completeness of set $X = \mathbb{R}$ with the metric $d(x, y) = \frac{|x-y|}{1+|x-y|}$
33309
Subgroup of $\mathbb{R}$ either dense or has a least positive element?
99562
"Sum" of positive measure set contains an open interval?
108305
How can we show that the dyadic rationals are dense in $\mathbb R$?
88523
Show that $A=\{ \frac{m}{2^n}:m\in \mathbb {Z},n\in \mathbb {N} \} $ is dense in $\mathbb {R}$
81150
Positive integer multiples of an irrational mod 1 are dense
13224
Continuous function positive at a point is positive in a neighborhood of that point
154621
A set with a finite integral of measure zero?
78082
Dense subset of two Banach spaces also dense in the intersection
63529
How to show that this set is compact in $\ell^2$
43254
If $A\subseteq\mathbb N$ and $\sum\limits_{a\in A}\frac1a$ converges then $A$ has natural density $0$