Description: Alternate definition of the class of cosets by R (see the comment of df-coss ). (Contributed by Peter Mazsa, 27-Dec-2018)
Ref | Expression | ||
---|---|---|---|
Assertion | dfcoss3 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | brcnvg | ||
2 | 1 | el2v | |
3 | 2 | anbi1i | |
4 | 3 | exbii | |
5 | 4 | opabbii | |
6 | df-co | ||
7 | df-coss | ||
8 | 5 6 7 | 3eqtr4ri |