Step |
Hyp |
Ref |
Expression |
1 |
|
2wlkd.p |
|
2 |
|
2wlkd.f |
|
3 |
|
2wlkd.s |
|
4 |
|
2wlkd.n |
|
5 |
|
2wlkd.e |
|
6 |
|
2wlkd.v |
|
7 |
|
2wlkd.i |
|
8 |
|
2trld.n |
|
9 |
1 2 3 4 5 6 7
|
2wlkond |
|
10 |
1 2 3 4 5 6 7 8
|
2trld |
|
11 |
3
|
simp1d |
|
12 |
3
|
simp3d |
|
13 |
|
s2cli |
|
14 |
2 13
|
eqeltri |
|
15 |
14
|
a1i |
|
16 |
|
s3cli |
|
17 |
1 16
|
eqeltri |
|
18 |
17
|
a1i |
|
19 |
6
|
istrlson |
|
20 |
11 12 15 18 19
|
syl22anc |
|
21 |
9 10 20
|
mpbir2and |
|