Description: The membership relation is a relation. (Contributed by NM, 26-Apr-1998) (Revised by Mario Carneiro, 21-Dec-2013)
Ref | Expression | ||
---|---|---|---|
Assertion | rele | |- Rel _E |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-eprel | |- _E = { <. x , y >. | x e. y } |
|
2 | 1 | relopabiv | |- Rel _E |