Item 0.4.1.d.
Such an element is 2 (in fact, that is the only element in the codomain that is not in the range). In other words, 2 is not the image of any element under \(f\text{;}\) nothing is sent to 2.
Such an element is 2 (in fact, that is the only element in the codomain that is not in the range). In other words, 2 is not the image of any element under \(f\text{;}\) nothing is sent to 2.