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If (f:A\to B) and (f(a)=b), what is (a) called for (b)?

Answer and explanation

Correct answer: Preimage

The direct answer is A: preimage. If f:A→B and f(a)=b, then a is the input that is sent to b, while b is the resulting output. The input a is therefore called the preimage of b, and b is called the image of a. Option A is correct because it names the element before the mapping. Option B, image, is the name for b, not a. Option C, codomain, means the set B into which the function maps all elements; it is a whole set, not the particular input a. Option D, range, means the set of actual output values produced by the function; it is also a set, not the single input a. For example, if f(2)=7, then 2 is the preimage of 7 and 7 is the image of 2. The arrow direction is important: input comes first and output comes second. Memory cue: preimage is the value you start from; image is the value you reach.

Related tags

Relations-FunctionsImage-PreimageNotation

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