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Mirrors > Home > MPE Home > Th. List > nnz | Structured version Visualization version GIF version |
Description: A positive integer is an integer. (Contributed by NM, 9-May-2004.) |
Ref | Expression |
---|---|
nnz | ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℤ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nnssz 12270 | . 2 ⊢ ℕ ⊆ ℤ | |
2 | 1 | sseli 3913 | 1 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℤ) |
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