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| Mirrors > Home > ILE Home > Th. List > znq | GIF version | ||
| Description: The ratio of an integer and a positive integer is a rational number. (Contributed by NM, 12-Jan-2002.) |
| Ref | Expression |
|---|---|
| znq | ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℕ) → (𝐴 / 𝐵) ∈ ℚ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2196 | . . 3 ⊢ (𝐴 / 𝐵) = (𝐴 / 𝐵) | |
| 2 | rspceov 5968 | . . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℕ ∧ (𝐴 / 𝐵) = (𝐴 / 𝐵)) → ∃𝑥 ∈ ℤ ∃𝑦 ∈ ℕ (𝐴 / 𝐵) = (𝑥 / 𝑦)) | |
| 3 | 1, 2 | mp3an3 1337 | . 2 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℕ) → ∃𝑥 ∈ ℤ ∃𝑦 ∈ ℕ (𝐴 / 𝐵) = (𝑥 / 𝑦)) |
| 4 | elq 9713 | . 2 ⊢ ((𝐴 / 𝐵) ∈ ℚ ↔ ∃𝑥 ∈ ℤ ∃𝑦 ∈ ℕ (𝐴 / 𝐵) = (𝑥 / 𝑦)) | |
| 5 | 3, 4 | sylibr 134 | 1 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℕ) → (𝐴 / 𝐵) ∈ ℚ) |
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