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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 12621 | . 2 ⊢ ℕ = (ℤ≥‘1) | |
2 | 1 | eleq2i 2830 | 1 ⊢ (𝑁 ∈ ℕ ↔ 𝑁 ∈ (ℤ≥‘1)) |
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