A relation is a mapping from one set to another. It is a function if elements of the first set are mapped to only one element from the second set. So, for example, square root is not a function because 9 can be mapped to -3 and 3.
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A relation is a function if every input has a distinct output.
relation and function are number that combine with number and neqative number to .
Because a function has additional restrictions, which the relation may, or may not, satisfy.
Function is a special case of relation. It means function is a relation but all relations are not functions. Therefore all functions are relations.