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| Mirrors > Home > ILE Home > Th. List > nnuz | GIF version | ||
| Description: Positive integers expressed as an upper set of integers. (Contributed by NM, 2-Sep-2005.) |
| Ref | Expression |
|---|---|
| nnuz | ⊢ ℕ = (ℤ≥‘1) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnzrab 9350 | . 2 ⊢ ℕ = {𝑘 ∈ ℤ ∣ 1 ≤ 𝑘} | |
| 2 | 1z 9352 | . . 3 ⊢ 1 ∈ ℤ | |
| 3 | uzval 9603 | . . 3 ⊢ (1 ∈ ℤ → (ℤ≥‘1) = {𝑘 ∈ ℤ ∣ 1 ≤ 𝑘}) | |
| 4 | 2, 3 | ax-mp 5 | . 2 ⊢ (ℤ≥‘1) = {𝑘 ∈ ℤ ∣ 1 ≤ 𝑘} |
| 5 | 1, 4 | eqtr4i 2220 | 1 ⊢ ℕ = (ℤ≥‘1) |
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