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| Mirrors > Home > MPE Home > Th. List > 1z | Structured version Visualization version GIF version | ||
| Description: One is an integer. (Contributed by NM, 10-May-2004.) |
| Ref | Expression |
|---|---|
| 1z | ⊢ 1 ∈ ℤ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1nn 12277 | . 2 ⊢ 1 ∈ ℕ | |
| 2 | 1 | nnzi 12641 | 1 ⊢ 1 ∈ ℤ |
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