Concept of Mapping
This is the rule which assigns an element x in set A to another unique element y in set B. Set A is called the Domain while set B is the Co-domain.



Set A = {w, x, y, z} ➝ Domain

Set B = {e, f, g, h, i} ➝ Co- domain

Image: This is the unique element in set B produced by element in set A

Range: This is the collection of all images of elements of the domain.

Using the diagram above:

f(w) = g, f(x) = b, f(y)=f, f(z) = a

a, b, f and g are the images of elements a, b, c and d respectively.

Range = {a,b,f,g}

The rule which associates each element in set A to a unique element in set B is denoted by any of the following notations: f: A ➝ B or f: A➝B