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| Mirrors > Home > ILE Home > Th. List > 1nn0 | GIF version | ||
| Description: 1 is a nonnegative integer. (Contributed by Raph Levien, 10-Dec-2002.) |
| Ref | Expression |
|---|---|
| 1nn0 | ⊢ 1 ∈ ℕ0 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1nn 9196 | . 2 ⊢ 1 ∈ ℕ | |
| 2 | 1 | nnnn0i 9452 | 1 ⊢ 1 ∈ ℕ0 |
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