Description: A natural number is an extended real. (Contributed by Glauco Siliprandi, 11-Dec-2019)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | nnxrd.1 | |- ( ph -> A e. NN ) |
|
| Assertion | nnxrd | |- ( ph -> A e. RR* ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnxrd.1 | |- ( ph -> A e. NN ) |
|
| 2 | 1 | nnred | |- ( ph -> A e. RR ) |
| 3 | 2 | rexrd | |- ( ph -> A e. RR* ) |