Question

For a relation \(R\), the domain is the set of all:

Options

• elements of the codomain not used by \(R\)

• second components of the ordered pairs in \(R\)

• ordered pairs in \(R\)

• first components of the ordered pairs in \(R\)

Answer 1

The domain of a relation consists of all first elements appearing in its ordered pairs. It identifies the inputs that are actually used by the relation.