`BookProof.ChapterEntropy.exists_injective_not_surjective` : ∃ f : ℕ → ℕ, Function.Injective f ∧ ¬ Function.Surjective f

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`BookProof.ChapterEntropy.exists_injective_not_surjective` : ∃ f : ℕ → ℕ, Function.Injective f ∧ ¬ Function.Surjective f · Prove2Me