# Relation1

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# Relation

Any questions you may have after viewing this infomation please raise them with your math teacher Mr.mark.

A **relation** can be represented:

- using an algebraic expression

- by use of a relation/mapping/arrow diagram
- as a graph

- as a set of ordered pairs

{(1,3),(2,5),(3,7).......}

There are 4 types of **relations**:

- one to one mapping.(1-1)
- many to one mapping. (M-1)
- one to many mapping. (1-M)
- many to many mapping. (M-M)

A **function** is a relation in which one or more numbers in the domain is mapped onto only one and only one number in the range. Thus a function maybe:

- a one to one mapping or
- a many to one mapping

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