Set theory, motivating factors
120701
Why do we need to learn Set Theory?
33117
Cyclic containment of sets
20140
Example of set which contains itself
47697
Russell's paradox: a set cannot contain its own powerset
45878
Elementary Set Theory: Ordinals, Well Orderings and Isomorphisms
140868
Axiomatization of $\mathbb{Z}$ via well-ordering of positives.
44160
Set theory: difference between belong/contained and includes/subset?
116527
Validating a proof for necessary and sufficient conditions on sets A & B such that $P(A) \cup P(B) = P(A\cup B)$
144266
set theory proof of $A\cap B = A \setminus(A\setminus B)$
101741
Selection of logical connectives {¬,∨,∧,⇒,⇔} in set theory?
7865
Complete Newbie: Axiom of Foundation Exercise
35362
Number of equivalence relations on a set
66948
Proving question on sets
9850
How many ways are there to choose 3 subsets $A,B,C$ of a set $\{1,2,3...n\}$ such that $ A \cap B \cap C = \emptyset $
123613
Double Complement of a set proof
144360
For any sets $A$ and $B$, show that $(B\smallsetminus A)\cup A=B \iff A\subseteq B$.
29755
Power set equivalency of Axiom of Choice