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* ) |