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| Mirrors > Home > MPE Home > Th. List > peano2nn0 | Structured version Visualization version GIF version | ||
| Description: Second Peano postulate for nonnegative integers. (Contributed by NM, 9-May-2004.) |
| Ref | Expression |
|---|---|
| peano2nn0 | ⊢ (𝑁 ∈ ℕ0 → (𝑁 + 1) ∈ ℕ0) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1nn0 12526 | . 2 ⊢ 1 ∈ ℕ0 | |
| 2 | nn0addcl 12545 | . 2 ⊢ ((𝑁 ∈ ℕ0 ∧ 1 ∈ ℕ0) → (𝑁 + 1) ∈ ℕ0) | |
| 3 | 1, 2 | mpan2 691 | 1 ⊢ (𝑁 ∈ ℕ0 → (𝑁 + 1) ∈ ℕ0) |
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