Functions and Set Theory
62709
Functions that are sets of all function - proofs
158882
Prove the existence of some weird family of sets
153510
Questions about the existence of a function
45792
Rigorous proof that surjectivity implies injectivity for finite sets
102515
Counting functions between two sets
70940
Homework - set theory infinite union
44974
Infinite set and countable subsets
54497
Set Notation - Inclusion and Proper Inclusion
45878
Elementary Set Theory: Ordinals, Well Orderings and Isomorphisms
154474
Image of countable and uncountable sets
48765
Let $S$ and $T$ be finite non-empty sets such that $|S| = |T|$. Show that the function $f : S\to T$ is onto if and only if it is one-to-one.
102592
Arbitrary Set A a Function??
151947
Finding a pair of functions with properties
46875
The identity morphism in $\mathbf{Set}$ is the identity function
81203
Supremum and infimum of sets
98151
Suppose that A is a countable set. Show that the set B is also countable if there is an onto function f from A to B.
107160
Open Set and Measure Theory