Lower Bound for subsets of $\mathbb{N}$
86518
Does $X$ have a lower bound?
40937
Is the set of partial order relations over $ \mathbb{N}$ countable?
131559
Lower Bound of Central Binomial Coefficients
53132
A convex subset of a set has 'smaller' boundary than the set?
142583
Subsets of the Cantor set
86902
Consider the smallest number in each of the $n\choose r$ subsets (of size $r$) of $S=\{1,2,\ldots,n\}$...
67451
Building a bijection from a finite union of countable sets to $\mathbb{N}$
51671
lower bounding logarithm of sums
144821
Number of ordered pairs of subsets
72420
Is $\mathbb{N}$ impossible to pin down?
117658
A set with n elements has 2^n subsets
5118
Show that $n ≤ 100$ if $ \{A_1,A_2,... ,A_n\}$ is a set of distinct $3$-element subsets of $\{1, 2,... , 36\}$ such that...
57822
Number of ways to choose two disjoint subsets of a set
95747
Number of countable subsets of $\mathbb{R}$
11849
Size of a union of two sets
8710
Bounds for $n$-th prime
158569
Proving a particular subset of $R^n$ is closed