Relation1

=Relation=

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A relation can be represented:
 * using an algebraic expression

{(1,3),(2,5),(3,7).......}
 * by use of a relation/mapping/arrow diagram
 * as a graph
 * as a set of ordered pairs

There are 4 types of relations:
 * 1) one to one mapping.(1-1)
 * 2) many to one mapping. (M-1)
 * 3) one to many mapping. (1-M)
 * 4) 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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