Question
$g : N \rightarrow N$, 'subtract $2$ from the elements of the domain'. Can this rule be called a function?

Answer

$g:$ $N \rightarrow N$, i.e., $N=\{1,2,3, \ldots\} ; N=\{1,2,3, \ldots\}$. Therefore, 'subtract $2$ from the elements of the domain' this rule cannot be called a function.

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