Description: A positive surreal integer is a surreal integer. Deduction form. (Contributed by Scott Fenton, 26-May-2025)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | nnzsd.1 | ⊢ ( 𝜑 → 𝐴 ∈ ℕs ) | |
| Assertion | nnzsd | ⊢ ( 𝜑 → 𝐴 ∈ ℤs ) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | nnzsd.1 | ⊢ ( 𝜑 → 𝐴 ∈ ℕs ) | |
| 2 | nnzs | ⊢ ( 𝐴 ∈ ℕs → 𝐴 ∈ ℤs ) | |
| 3 | 1 2 | syl | ⊢ ( 𝜑 → 𝐴 ∈ ℤs ) |