What's a good introductory text to ZF set theory?
2334
Best book on axiomatic set theory.
13793
Best book of topology for beginner?
113863
The non-existence of non-principal ultrafilters in ZF
111723
Can it be proven in $\sf ZF^{\neg\infty}$ that the sets $x_n=\{x_{n+1}\}$ do not exist?
141299
Alternative set theories
52452
Good textbooks on homological algebra
24698
Reference request: introduction to commutative algebra
136439
Where can I read the full proof of the Banach-Mazur theorem?
21938
describing all possible topologies on a set
65308
Axiom of Choice: Family of non-empty sets mutually disjoint or not?
9158
Proving that a propositional theory of any cardinality has an independent set of axioms
64413
Best books on Representation theory
130771
Sets and the principle of inclusion and exclusion
76662
What is a good complex analysis textbook, barring Ahlfors's?
58602
In ZF, how would the structure of the cardinal numbers change by adopting this definition of cardinality?
158671
Cardinality of a set that consists of all existing cardinalities
30587
Uncountable well ordered set in $Z^-$ theory.