1.

Let f be the subset of `Z xxZ`defined by `f = {(a b , a + b) : a , b in Z}`. Is f a function from Z to Z? Justify your answer.

Answer» `f(ab) = a+b`
`f(12) = f(2*6) = 2+6=8`
`f(4*3) = 3+4 = 7`
`f(1*12) = 1+12 = 13`
so this relation is not a function


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