Description: Alternate definition of the class of functions. For the X axis and the Y axis you can convert the right side to { f e. Rels | A. x1 E* y1 x1 f y1 } . (Contributed by Peter Mazsa, 31-Aug-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | dffunsALTV4 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dffunsALTV | ||
2 | cosselcnvrefrels4 | ||
3 | cosselrels | ||
4 | 3 | biantrud | |
5 | 2 4 | bitr4id | |
6 | 1 5 | rabimbieq |