Description: Alternate definition of the class of functions. (Contributed by Peter Mazsa, 30-Aug-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | dffunsALTV2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dffunsALTV | ||
2 | cosselcnvrefrels2 | ||
3 | cosselrels | ||
4 | 3 | biantrud | |
5 | 2 4 | bitr4id | |
6 | 1 5 | rabimbieq |