Do functions require set theory?
102620
Confusion about the definition of function
36721
Is "The empty set is a subset of any set" a convention?
153510
Questions about the existence of a function
858
Is $\{\emptyset\}$ a subset of $\{\{\emptyset\}\}$?
13273
Cardinality of the set of all real functions of real variable
16796
Zermelo-Fraenkel set theory and Hilbert's axioms for geometry
120188
Why is the real line not used in Descriptive Set Theory?
61747
Proof of exchange principle in set theory
153551
Is the null set a subset of every set?
44160
Set theory: difference between belong/contained and includes/subset?
65953
Cardinality of the set of differentiable functions
101232
Does proper map $f$ take discrete sets to discrete sets?
124847
Is the set of surjective functions from $\mathbb{N}$ to $\mathbb{N}$ uncountable?
121847
Don't we need the axiom of choice to choose from a non-empty set?
98559
subtlety of self-defined function and its evaluation
151215
Paradox of General Comprehension in Set Theory, other than Russell's Paradox
54497
Set Notation - Inclusion and Proper Inclusion