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| Mirrors > Home > ILE Home > Th. List > 2z | GIF version | ||
| Description: Two is an integer. (Contributed by NM, 10-May-2004.) | 
| Ref | Expression | 
|---|---|
| 2z | ⊢ 2 ∈ ℤ | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | 2nn 9152 | . 2 ⊢ 2 ∈ ℕ | |
| 2 | 1 | nnzi 9347 | 1 ⊢ 2 ∈ ℤ | 
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