Description: A positive surreal integer is a surreal. (Contributed by Scott Fenton, 15-Apr-2025)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | nnsnod.1 | |- ( ph -> A e. NN_s ) | |
| Assertion | nnsnod | |- ( ph -> A e. No ) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | nnsnod.1 | |- ( ph -> A e. NN_s ) | |
| 2 | nnsno | |- ( A e. NN_s -> A e. No ) | |
| 3 | 1 2 | syl | |- ( ph -> A e. No ) |