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If (R\subseteq A\times B) and some element of (A) is not related to any element, why will (R) not be a function?

Answer and explanation

Correct answer: Because every (x\in A) must have an image

A function is a relation with a complete domain assignment. This means that every member of the domain set A must be connected to one and only one member of the codomain set B. The word “every” is essential: a function cannot leave even one input without an output. Therefore, if some element of A is not related to any element of B, the relation fails the basic existence requirement for a function. It may still be a relation, but it is not a function from A to B.

Option A is correct because every x in A must have an image under the function. It is not necessary that every y in B have an image; that condition would concern surjectivity, not the definition of a function. The other choices do not state the defining requirement. Hence the supplied answer is correct.

Related tags

FunctionsExistence-ConditionNot-Function

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