Step |
Hyp |
Ref |
Expression |
1 |
|
3wlkd.p |
|
2 |
|
3wlkd.f |
|
3 |
|
3wlkd.s |
|
4 |
|
3wlkd.n |
|
5 |
|
3wlkd.e |
|
6 |
|
3wlkd.v |
|
7 |
|
3wlkd.i |
|
8 |
|
3trld.n |
|
9 |
|
3spthd.n |
|
10 |
1 2 3 4 5 6 7 8
|
3trlond |
|
11 |
1 2 3 4 5 6 7 8 9
|
3spthd |
|
12 |
3
|
simplld |
|
13 |
3
|
simprrd |
|
14 |
|
s3cli |
|
15 |
2 14
|
eqeltri |
|
16 |
|
s4cli |
|
17 |
1 16
|
eqeltri |
|
18 |
15 17
|
pm3.2i |
|
19 |
18
|
a1i |
|
20 |
6
|
isspthson |
|
21 |
12 13 19 20
|
syl21anc |
|
22 |
10 11 21
|
mpbir2and |
|