Density of rational numbers
62224
Need help with proof for Dedekind cuts on $\mathbb{Q}^+$
142577
Algebraic proof that a set generated by irrational rotations is dense in $S^1$.
95294
Dense subset of $C[0,1]$ which preserves rationals
111898
Is $\{ (e^{2\pi i a n},e^{2\pi i b n }) : n \in \mathbb{Z} \}$ dense in the torus, where $a,b$ irrationals such that $a/b$ irrational?
34315
Rational, integers and probability
53967
distribution of prime numbers
32503
Density of the sum of $n$ uniform(0,1) distributed random variables
87764
Prove that the difference between two rational numbers is rational
83145
Sum of rational numbers
22865
Sine function dense in $[-1,1]$
86497
Prove that any rational can be expressed in the form $\sum\limits_{k=1}^n{\frac{1}{a_k}}$, $a_k\in\mathbb N^*$
81150
Positive integer multiples of an irrational mod 1 are dense
117132
Rationals of the form $\frac{p}{q}$ where $p,q$ are primes in $[a,b]$
5287
Representing every positive rational number in the form of $(a^n+b^n)/(c^n+d^n)$
20619
Finding Rational numbers
148310
Showing rational numbers are algebraic
78915
Density of the set $S=\{m/2^n| n\in\mathbb{N}, m\in\mathbb{Z}\}$ on $\mathbb{R}$?