Non-circular definition of set theory
30481
How to avoid perceived circularity when defining a formal language?
40662
What is the definition of a set?
21938
describing all possible topologies on a set
93750
Can a set be neither open nor closed?
108922
Cardinality and infinite sets: naturals, integers, rationals, bijections
90826
Constructing a subset not in $\mathcal{B}(\mathbb{R})$ explicitly
47251
Non-compactness of $\mathbb{R}$ with the cocountable topology
24050
Characterization of the Closure of a Set
121847
Don't we need the axiom of choice to choose from a non-empty set?
44522
Subsets of the reals when the Continuum Hypothesis is assumed false
88099
Not $\sigma$-compact set without axiom of choice
31389
consistency of ZF\{Power Set axiom}
146062
A "Cantor-Schroder-Bernstein" theorem for partially-ordered-sets
33117
Cyclic containment of sets
5964
Are there areas of mathematics (current or future) that cannot be formalized in set theory?
139155
What does 2 to the power x mean in set theory
110957
No non-trivial clopen sets in $\mathbb{R}$? How to give a direct proof?