Set theory - Axiom of Union
950
Doubts on the axiom of union?
74734
(Enderton set theory) Hartog's theorem and cardinal numbers
89506
Union of disjoint sets : Equivalence relations
81843
Sequences of sets property
17624
Axiom of Choice iff Every set has a choice function
153935
A weaker Axiom of Infinity?
20252
The Axiom of Choice and the Cartesian Product.
59820
ZF Extensionality axiom
9158
Proving that a propositional theory of any cardinality has an independent set of axioms
134120
Prove statement with a counter-example: For all sets S, T and V, V ∪ (S ∩ T) = (V ∪ S) ∩ T is false
27899
Can we prove the existence of $A\cup B$ without the union axiom?
78290
Countable axiom of choice: why you can't prove it from just ZF
9330
Meaning behind Filter in Set Theory
54497
Set Notation - Inclusion and Proper Inclusion
135025
Axiomatization of a Topology using the Boundary
62936
Proving equivalencies of two versions of the Axiom of Choice
44160
Set theory: difference between belong/contained and includes/subset?