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| Mirrors > Home > MPE Home > Th. List > elnnuz | Structured version Visualization version GIF version | ||
| Description: A positive integer expressed as a member of an upper set of integers. (Contributed by NM, 6-Jun-2006.) |
| Ref | Expression |
|---|---|
| elnnuz | ⊢ (𝑁 ∈ ℕ ↔ 𝑁 ∈ (ℤ≥‘1)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnuz 12900 | . 2 ⊢ ℕ = (ℤ≥‘1) | |
| 2 | 1 | eleq2i 2827 | 1 ⊢ (𝑁 ∈ ℕ ↔ 𝑁 ∈ (ℤ≥‘1)) |
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