it to mean what is now called the image. To avoid any confusion, a number of modern books don't use the word "range" at all.

Elaboration and example

Given a function

with domain , the range of , sometimes denoted or , may refer to the codomain or target set (i.e., the set into which all of the output of is constrained to fall), or to , the image of the domain of under (i.e., the subset of consisting of all actual outputs

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