Step |
Hyp |
Ref |
Expression |
1 |
|
doch11.h |
|
2 |
|
doch11.i |
|
3 |
|
doch11.o |
|
4 |
|
doch11.k |
|
5 |
|
doch11.x |
|
6 |
|
doch11.y |
|
7 |
|
eqid |
|
8 |
|
eqid |
|
9 |
1 7 2 8
|
dihrnlss |
|
10 |
4 6 9
|
syl2anc |
|
11 |
|
eqid |
|
12 |
11 8
|
lssss |
|
13 |
10 12
|
syl |
|
14 |
1 2 7 11 3
|
dochcl |
|
15 |
4 13 14
|
syl2anc |
|
16 |
1 2 3 4 5 15
|
dochord |
|
17 |
1 2 3
|
dochoc |
|
18 |
4 6 17
|
syl2anc |
|
19 |
18
|
sseq1d |
|
20 |
16 19
|
bitrd |
|