Description: A positive real is not empty. (Contributed by NM, 15-May-1996) (Revised by Mario Carneiro, 11-May-2013) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | prn0 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elnpi | |
|
2 | simpl2 | |
|
3 | 1 2 | sylbi | |
4 | 0pss | |
|
5 | 3 4 | sylib | |