Sets, Relations and Functions — Important Questions

{(1,2), (2,3), (3,4)}

A function requires each input (first element) to have exactly one output. Here, no input repeats with different outputs.

{1, 2, 3}

The domain of a relation is the set of all first elements of the ordered pairs.

{2, 3, 4}

The range is the set of all second elements (outputs) of the ordered pairs in the function.

Z

Z is the standard notation for the set of all integers, positive, negative, and zero.