Proving the supremum of set
117257
Proving the supremum of the set {$\cos (1/x)$} is 1
22804
Interpretation of limsup-liminf of sets
1521
Supremum and Infimum
29849
How can I show that $\sup(AB)\geq\sup A\sup B$ for $A,B\subset\mathbb{R}$ where $A\cup B$ is positive and bounded?
122271
A subset of a transitive set is transitive
9268
Proving that the Union of Two Compact Sets is Compact
120309
Number Theory Inequality Proof
18907
Is this proof of $\liminf E_k \subset \limsup E_k $ correct?
126632
Proving Inequalities with Absolute values
17212
The preimage of a subset
7112
Product of sets and supremum
116527
Validating a proof for necessary and sufficient conditions on sets A & B such that $P(A) \cup P(B) = P(A\cup B)$
59535
Prove that there exists such a set of $n$ positive integers
104308
Proving a set is a Sigma Algebra
151686
A proof that the Cantor set is Perfect
90590
Prove that the following set is dense
10180
How to prove that this set is closed?