How many surjective functions from set A to B?
61
Calculating the total number of surjective functions
133699
Proving that there is a bijection between $A$ and $B$.
84114
Does there exist a surjective homomorphism from $(\mathbb R,+)$ to $(\mathbb Q,+)$ ?
5375
Is there a bijective function mapping Natural numbers to Natural numbers, other than $f(n) = n$?
40486
Number of One-to-One Functions
82655
Number of Injective Maps
46971
Number of surjections from $\{1,...,m\}$ to $\{1,...,n\}$
145781
Is the collection of all functions between two sets a set?
93040
$f$ is surjective iff it has a right inverse: using the axiom of choice and errors in ProofWiki
133083
Injectivity and surjectivity of a recursive function
40868
Composition of two functions - Bijection
52348
Counting the number of surjections.
64866
Proving a Composition of Functions is Bijective
21391
Proving Functions are Surjective
20199
Find a surjective function $f:\mathbb{N}\to \mathbb{Q}$
103625
Number of increasing functions from $\{1,2,\dots, n\}$ to itself.
113360
How many injective functions $f:[1,...,m]\to{[1,...,n]}$ has no fixed point? $(m\le n)$