Set theory proof; (subsets, universal set)
70307
$(A\cap B)\cup C = A \cap (B\cup C)$ if and only if $C \subset A$
117561
A set is infinite iff there is a one-to-one correspondent with one of its proper subsets?
111032
Proof of Sets involving the Cartesian Product
105886
A question on the proof of 14 distinct sets can be formed by complementation and closure
151521
Set Theory: Tree Property
144787
Show that the set of all infinite subsets of $\mathbb{N}$ has cardinality greater than $\mathbb{N}$
88628
Proving the total number of subsets of S is equal to $2^n$
151295
Proving $|S \times \mathbb{N}|=|S|$ when $S$ is an infinite set
136755
Direct proof of empty set being subset of every set
117658
A set with n elements has 2^n subsets
11817
Proving that every set $A \subset \Bbb N$ of size $n$ contains a subset $B \subset A$ with $n | \sum_{b \in B} b$
58186
Set theory proof, $\exists g(g\colon A\twoheadrightarrow C)$ or $\exists h(h\colon C\hookrightarrow B)$
144266
set theory proof of $A\cap B = A \setminus(A\setminus B)$
56399
Proof for $A \cup B = B$ if and only if $A \subset B$
83518
Proving Two sets have same cardinality
139247
Real Analysis - Prove a set is countable
9158
Proving that a propositional theory of any cardinality has an independent set of axioms