Description: At least one atom exists. (Contributed by NM, 15-Jul-2012)
Ref | Expression | ||
---|---|---|---|
Hypothesis | atex.1 | ||
Assertion | atex |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | atex.1 | ||
2 | 1 | hl2at | |
3 | df-rex | ||
4 | exsimpl | ||
5 | 3 4 | sylbi | |
6 | 2 5 | syl | |
7 | n0 | ||
8 | 6 7 | sylibr |