Step |
Hyp |
Ref |
Expression |
1 |
|
1wlkd.p |
|
2 |
|
1wlkd.f |
|
3 |
|
1wlkd.x |
|
4 |
|
1wlkd.y |
|
5 |
3 4
|
s2cld |
|
6 |
|
wrdf |
|
7 |
|
1z |
|
8 |
|
fzval3 |
|
9 |
7 8
|
ax-mp |
|
10 |
2
|
fveq2i |
|
11 |
|
s1len |
|
12 |
10 11
|
eqtri |
|
13 |
12
|
oveq2i |
|
14 |
|
s2len |
|
15 |
|
df-2 |
|
16 |
14 15
|
eqtri |
|
17 |
16
|
oveq2i |
|
18 |
9 13 17
|
3eqtr4i |
|
19 |
18
|
a1i |
|
20 |
19
|
feq2d |
|
21 |
6 20
|
mpbird |
|
22 |
5 21
|
syl |
|
23 |
1
|
feq1i |
|
24 |
22 23
|
sylibr |
|