Description: A finite set satisfies the ultrafilter lemma. (Contributed by Mario Carneiro, 26-Aug-2015)
Ref | Expression | ||
---|---|---|---|
Assertion | fiufl | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pwfi | |
|
2 | pwfi | |
|
3 | finnum | |
|
4 | numufl | |
|
5 | 3 4 | syl | |
6 | 2 5 | sylbi | |
7 | 1 6 | sylbi | |