Description: The class of cosets by R is reflexive, see dfrefrel3 . (Contributed by Peter Mazsa, 30-Jul-2019)
Ref | Expression | ||
---|---|---|---|
Assertion | refrelcoss3 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | refrelcosslem | |
|
2 | idinxpssinxp4 | |
|
3 | 1 2 | mpbir | |
4 | rncossdmcoss | |
|
5 | 4 | raleqi | |
6 | 5 | ralbii | |
7 | 3 6 | mpbir | |
8 | relcoss | |
|
9 | 7 8 | pm3.2i | |