Description: The function S is a family of subgroups. (Contributed by Mario Carneiro, 25-Apr-2016)
Ref | Expression | ||
---|---|---|---|
Assertion | dprdf | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | reldmdprd | |
|
2 | 1 | brrelex2i | |
3 | 2 | dmexd | |
4 | eqid | |
|
5 | eqid | |
|
6 | eqid | |
|
7 | eqid | |
|
8 | 5 6 7 | dmdprd | |
9 | 3 4 8 | sylancl | |
10 | 9 | ibi | |
11 | 10 | simp2d | |