Description: Alternate definition of the disjoint relation predicate, cf. dffunALTV3 . (Contributed by Peter Mazsa, 28-Jul-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | dfdisjALTV3 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfdisjALTV2 | ||
2 | cosscnvssid3 | ||
3 | 2 | anbi1i | |
4 | 1 3 | bitri |