Description: Express the predicate " J is a topology" using nonempty finite intersections instead of binary intersections as in istopg . (Contributed by NM, 19-Jul-2006)
Ref | Expression | ||
---|---|---|---|
Assertion | istop2g | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | istopg | |
|
2 | fiint | |
|
3 | 2 | anbi2i | |
4 | 1 3 | bitrdi | |