A bijective function / bijection is a function that is both injective and surjective.
The set of all bijections from $X$ onto $Y$ is denoted by
\[\bij(X,Y).\]
- Synonym of bijection: One-to-one correspondence
A bijective function / bijection is a function that is both injective and surjective.
The set of all bijections from $X$ onto $Y$ is denoted by
\[\bij(X,Y).\]