Step |
Hyp |
Ref |
Expression |
1 |
|
dvrass.b |
|
2 |
|
dvrass.o |
|
3 |
|
dvrass.d |
|
4 |
|
dvrass.t |
|
5 |
|
simp1 |
|
6 |
|
simp2 |
|
7 |
1 2
|
unitcl |
|
8 |
7
|
3ad2ant3 |
|
9 |
|
simp3 |
|
10 |
1 2 3 4
|
dvrass |
|
11 |
5 6 8 9 10
|
syl13anc |
|
12 |
|
eqid |
|
13 |
2 3 12
|
dvrid |
|
14 |
13
|
3adant2 |
|
15 |
14
|
oveq2d |
|
16 |
1 4 12
|
ringridm |
|
17 |
16
|
3adant3 |
|
18 |
11 15 17
|
3eqtrd |
|