Description: The class of cosets by R is symmetric, see dfsymrel3 . (Contributed by Peter Mazsa, 28-Mar-2019) (Revised by Peter Mazsa, 17-Sep-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | symrelcoss3 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | brcosscnvcoss | ||
2 | 1 | el2v | |
3 | 2 | biimpi | |
4 | 3 | gen2 | |
5 | relcoss | ||
6 | 4 5 | pm3.2i |