Description: The class of cosets by R is reflexive, see dfrefrel2 . (Contributed by Peter Mazsa, 30-Jul-2019)
Ref | Expression | ||
---|---|---|---|
Assertion | refrelcoss2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | refrelcoss3 | |
|
2 | idinxpss | |
|
3 | 2 | anbi1i | |
4 | 1 3 | mpbir | |