Description: A non-negative surreal integer is a surreal. (Contributed by Scott Fenton, 15-Apr-2025)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | n0snod.1 | |- ( ph -> A e. NN0_s ) | |
| Assertion | n0snod | |- ( ph -> A e. No ) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | n0snod.1 | |- ( ph -> A e. NN0_s ) | |
| 2 | n0sno | |- ( A e. NN0_s -> A e. No ) | |
| 3 | 1 2 | syl | |- ( ph -> A e. No ) |