Proving a non-universal set doesn't exist in ZFC Set Theory
106414
Classifying whether a collection of objects is a set
156252
Are sets constructed using only ZF measurable using ZFC?
108922
Cardinality and infinite sets: naturals, integers, rationals, bijections
19924
Uncountable ordinals without power set axiom
14496
Is there any example of a non-measurable set whose proof of existence doesn't appeal to the Axiom of choice?
137203
Measurable cardinal existence condition
120188
Why is the real line not used in Descriptive Set Theory?
104744
Can sets of cardinality $\aleph_1$ have nonzero measure?
141299
Alternative set theories
62208
If $A$ is a non-empty set, then $A \notin A$
45878
Elementary Set Theory: Ordinals, Well Orderings and Isomorphisms
113863
The non-existence of non-principal ultrafilters in ZF
146560
Is there any uncountably infinite set that does not generate the reals?
50846
Is a set without limit points necessarily closed?
47697
Russell's paradox: a set cannot contain its own powerset
18364
When does the set enter set theory?
38726
What set theory axioms do I need to believe in uncountable ordinals?