Description: Element of the class of symmetric relations. (Contributed by Peter Mazsa, 17-Aug-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | elsymrels2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfsymrels2 | |
|
2 | cnveq | |
|
3 | id | |
|
4 | 2 3 | sseq12d | |
5 | 1 4 | rabeqel | |