Metamath Proof Explorer


Theorem nnno

Description: A positive surreal integer is a surreal. (Contributed by Scott Fenton, 15-Apr-2025)

Ref Expression
Assertion nnno ( 𝐴 ∈ ℕs → 𝐴 ∈ No )

Proof

Step Hyp Ref Expression
1 nnssno ⊢ ℕs ⊆ No
2 1 sseli ⊢ ( 𝐴 ∈ ℕs → 𝐴 ∈ No )