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| import data.nat.prime | |
| namespace nat | |
| definition Prime := subtype prime | |
| -- unit test | |
| definition two' : Prime := ⟨2,prime_two⟩ | |
| instance Prime_is_nat : has_coe Prime ℕ := ⟨subtype.val⟩ | |
| -- unit test | |
| example : (two' : ℕ) = 2 := rfl | |
| end nat |
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