Question: [20] A set A is computably enumerable without repetitions if A equals the range of f, for some f that is computable and one-to-one. Prove

[20] A set A is computably enumerable without repetitions if A equals the range of

f, for some f that is computable and one-to-one.

Prove that A is infinite and computably enumerable iff A is computably enumerable without repetitions.

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