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Mirrors > Home > MPE Home > Th. List > elfznn | Structured version Visualization version GIF version |
Description: A member of a finite set of sequential integers starting at 1 is a positive integer. (Contributed by NM, 24-Aug-2005.) |
Ref | Expression |
---|---|
elfznn | ⊢ (𝐾 ∈ (1...𝑁) → 𝐾 ∈ ℕ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elfzelz 13185 | . 2 ⊢ (𝐾 ∈ (1...𝑁) → 𝐾 ∈ ℤ) | |
2 | elfzle1 13188 | . 2 ⊢ (𝐾 ∈ (1...𝑁) → 1 ≤ 𝐾) | |
3 | elnnz1 12276 | . 2 ⊢ (𝐾 ∈ ℕ ↔ (𝐾 ∈ ℤ ∧ 1 ≤ 𝐾)) | |
4 | 1, 2, 3 | sylanbrc 582 | 1 ⊢ (𝐾 ∈ (1...𝑁) → 𝐾 ∈ ℕ) |
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