linguistic:voice_change
By listing function values

On a finite set a function may be defined by listing the elements of the codomain that are associated to the elements of the domain. For example, if A = { 1, 2, 3 } {\displaystyle A=\{1,2,3\}}, then one can define a function f: A → R {\displaystyle f:A\to \mathbb {R} } by f (1) = 2, f (2) = 3, f (3) = 4. {\displaystyle f(1)=2,f(2)=3,f(3)=4.}