To be or not to be

Algebra Level pending

If \( f: S \to T \), \( S = \{1, 2, 3, 4\} \), \( T = \{5, 6, 7\} \), \( f(1) = 5, f(2) = 6, f(3) = 7 \), then \( f \) is injective.

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