How many surjective functions are there.
64583
Number of surjective functions from A to B
82655
Number of Injective Maps
25563
Count number of increasing functions, nondecreasing functions $f: \{1, 2, 3, \ldots, n\} \to \{1, 2, 3, \ldots, m\}$, with $m \geq n$.
104757
If $f \circ g$ is surjective, then f is surjective
28798
Proving injection and surjection with functions $F:C^B\to C^A$, $F(f)=f\circ\varphi$, $\varphi: A\to B$
137883
Cardinality of the set of all (real) discontinuous functions
106748
Number of functions $f : A \to A$ such that $f(f(x))=f(x)$
11813
Injective functions also surjective?
146356
To prove two sets are isomorphic is it sufficient to find 2 injections or 2 surjections?
21391
Proving Functions are Surjective
117793
Finding a function $\mathbb{N} \to \mathbb{N}$ that is surjective but not injective.
40486
Number of One-to-One Functions
128350
Number of non-decreasing functions between two finite sets
16092
How to prove that the composition of two surjective functions is surjective
2072
Demonstrate that if $f$ is surjective then $X = f(f^{-1}(X))$
63146
Proof of properties of injective and surjective functions.
35286
number of differents vector space structures over the same field $\mathbb{F}$ on an abelian group