Injective Functions $X=\{1,2,3,4\}$ , $Y=\{1,2,3,4,5,6\}$
113360
How many injective functions $f:[1,...,m]\to{[1,...,n]}$ has no fixed point? $(m\le n)$
61
Calculating the total number of surjective functions
10850
Are all functions that have an inverse bijective functions?
24107
Bijection $f:\mathcal{P}(A)\to(A\to \{0,1\})$
74453
Injective and Surjective Functions
32432
Strategies to find the set of functions $f:\mathbb R\to\mathbb R$ satisfing the functional equation: $f(x^3)+f(y^3)=(x+y)(f(x^2)+f(y^2)-f(xy))$
124847
Is the set of surjective functions from $\mathbb{N}$ to $\mathbb{N}$ uncountable?
41593
Use of Bijection for computation
6023
Surjectivity of Composition of Surjective Functions
65977
Showing function is injective iff $f(M_1 \cap M_2) = f(M_1)\cap f(M_2)$
16092
How to prove that the composition of two surjective functions is surjective
142845
is $y = \sqrt{x^2 + 1}− x$ a injective (one-to-one) function?
152613
Injection from $\mathbb{N}\to\{0,1\}$ to the set of all monotonic decreasing functions from $\mathbb{N}\to\mathbb{Z}$
138258
What is the injective envelope of $\mathbb{Z}/n\mathbb{Z}$?
23464
How to find a explicit bijection for some $f:A\times B \rightarrow B \times A$
138481
$f(x)=x/1$ is not injective?
75473
If a group $G$ has odd order, then the square function is injective.