Description: Alternate definition of the function relation predicate, cf. dfdisjALTV2 . (Contributed by Peter Mazsa, 8-Feb-2018)
Ref | Expression | ||
---|---|---|---|
Assertion | dffunALTV2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-funALTV | ||
2 | cnvrefrelcoss2 | ||
3 | 2 | anbi1i | |
4 | 1 3 | bitri |