Mapping
Related Words
Definition of Mapping
The idea of pairing each member of the domain with each member of the range referred to as mapping.
Examples of Mapping

The figure shows a mapping of the elements of the domain to the elements of the range. Each element in the domain is increased by 1 to get the corresponding element in the range.
Video Examples: JEE MathMapping
Solved Example on Mapping
Ques: Use the mapping diagram for the relation and determine whether {(3,  1), (6,  1),(3,  2),(6,  2)} is a function or not.
Choices:
A. YesB. No
Correct Answer: B
Solution:

Step 1: Draw the mapping diagram for the given relation.
Step 2: A relation is a function if each element in the domain is paired with one and only one element in the range.
Step 3: From the mapping diagram, it can be observed that the given relation is not a function as '3' in the domain is paired with two elements  1 and  2 in the range and '6' is paired with  1 and  2.
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