The inf and sup of sets
10859
Prove $\sup(f+g) \le \sup f + \sup g$
59872
How to prove $\inf(S)=-\sup(-S)$?
153072
Guessing a subset of $\{1,...,N\}$
96931
Supremum and infimum of $\{\frac{1}{n}-\frac{1}{m}:m, n \in \mathbb{N}\}$
142886
Find set with maximal cardinality given constraints
19741
If $(\mu_t)_{t\in I}$ and $(\mu_t\ast\nu_t)_{t\in I}$ are tight, then $(\nu_t)_{t\in I}$ is tight
25769
Finding all posets on a set
142583
Subsets of the Cantor set
13779
Canonical copies of sets
73850
Cardinality of set of functions
68781
proving if $a \le b$ then $\sup(A) \le \inf(B)$
90590
Prove that the following set is dense
146062
A "Cantor-Schroder-Bernstein" theorem for partially-ordered-sets
125011
Show lim sup (an) = lim inf (an) for increasing for increasing sequence of subsets.
55995
Why is the supremum of the empty set $-\infty$ and the infimum $\infty$?
106756
Union and Intersection of Sets $A_{i}$ and $B_{j}$
17212
The preimage of a subset