In the context of a function F: X→Y, an element y ∈ Y is generally called an output or element of the codomain. More specifically, y is called the image of some element x ∈ X if y = F(x). If every element in Y is an output for at least one input x from X, then the function is called surjective or onto.
If F:X→Y is a function, then y ∈Y is called?
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