Properties of Functions

Let S1 = { a, b, c} and S2 = { 1, 2}.

Let f1 = { (a, 1), (b, 1), (c, 2) }

f1 is a function on S1.

Let f2 = { (a, 1), (b, 1), (b, 2), (c, 1) }

f2 is not a function.

Let f3 = { (a, 1), (b, 2)}

f3 is not a function on S1.

But it is a partial function on S1.

It’s actually a function on { a, b }.

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