Step |
Hyp |
Ref |
Expression |
1 |
|
2wlkd.p |
|
2 |
|
2wlkd.f |
|
3 |
|
2wlkd.s |
|
4 |
1 2 3
|
2wlkdlem3 |
|
5 |
|
simp1 |
|
6 |
5
|
eleq1d |
|
7 |
|
simp2 |
|
8 |
7
|
eleq1d |
|
9 |
|
simp3 |
|
10 |
9
|
eleq1d |
|
11 |
6 8 10
|
3anbi123d |
|
12 |
11
|
bicomd |
|
13 |
4 12
|
syl |
|
14 |
3 13
|
mpbid |
|
15 |
2
|
fveq2i |
|
16 |
|
s2len |
|
17 |
15 16
|
eqtri |
|
18 |
17
|
oveq2i |
|
19 |
|
fz0tp |
|
20 |
18 19
|
eqtri |
|
21 |
20
|
raleqi |
|
22 |
|
c0ex |
|
23 |
|
1ex |
|
24 |
|
2ex |
|
25 |
|
fveq2 |
|
26 |
25
|
eleq1d |
|
27 |
|
fveq2 |
|
28 |
27
|
eleq1d |
|
29 |
|
fveq2 |
|
30 |
29
|
eleq1d |
|
31 |
22 23 24 26 28 30
|
raltp |
|
32 |
21 31
|
bitri |
|
33 |
14 32
|
sylibr |
|