Description: Elementhood in the domain of cosets. (Contributed by Peter Mazsa, 29-Mar-2019)
Ref | Expression | ||
---|---|---|---|
Assertion | eldmcoss | |- ( A e. V -> ( A e. dom ,~ R <-> E. u u R A ) ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dmcoss3 | |- dom ,~ R = dom `' R |
|
2 | 1 | eleq2i | |- ( A e. dom ,~ R <-> A e. dom `' R ) |
3 | eldmcnv | |- ( A e. V -> ( A e. dom `' R <-> E. u u R A ) ) |
|
4 | 2 3 | syl5bb | |- ( A e. V -> ( A e. dom ,~ R <-> E. u u R A ) ) |