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Why is a function called a special form of relation?

Answer and explanation

Correct answer: Because each x∈A has exactly one image in B

The direct answer is A: each x in A has exactly one image in B. A relation is a collection of ordered pairs connecting elements of two sets. A function is a relation with one extra strict rule: every element of the domain must be connected to one and only one element of the codomain. Thus, every function is automatically a relation, but a general relation may fail the uniqueness rule. Option A is correct because it states both required ideas: every input has exactly one output. Option B is wrong because an input cannot have many outputs in a function; that describes a relation that is not a function. Option C is wrong because functions are made of ordered pairs. Option D is wrong because the domain need not be empty; it may contain many elements. Remember: one input, exactly one output.

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FunctionsSpecial-RelationSummary

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