Description: Elementhood in the domain of restricted cosets. (Contributed by Peter Mazsa, 30-Dec-2018)
Ref | Expression | ||
---|---|---|---|
Assertion | eldm1cossres |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eldmcoss | ||
2 | brres | ||
3 | 2 | exbidv | |
4 | 1 3 | bitrd | |
5 | df-rex | ||
6 | 4 5 | bitr4di |