1. A : Type
2. A Discrete
3. k : 4. f : k injA 5. {a:A| i:k. a = f(i) } Type
6. fk{a:A| i:k. a = f(i) }
7. Bij(k; {a:A| i:k. a = f(i) }; f)
fk bij {a:A| i:k. a = f(i) }
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