Step |
Hyp |
Ref |
Expression |
1 |
|
wrdnfi |
|
2 |
|
simpr |
|
3 |
2
|
a1i |
|
4 |
3
|
ss2rabi |
|
5 |
4
|
a1i |
|
6 |
1 5
|
ssfid |
|
7 |
|
wwlksn |
|
8 |
|
df-rab |
|
9 |
7 8
|
eqtrdi |
|
10 |
|
3anan12 |
|
11 |
10
|
anbi1i |
|
12 |
|
anass |
|
13 |
11 12
|
bitri |
|
14 |
13
|
abbii |
|
15 |
|
eqid |
|
16 |
|
eqid |
|
17 |
15 16
|
iswwlks |
|
18 |
17
|
anbi1i |
|
19 |
18
|
abbii |
|
20 |
|
df-rab |
|
21 |
14 19 20
|
3eqtr4i |
|
22 |
9 21
|
eqtrdi |
|
23 |
22
|
eleq1d |
|
24 |
6 23
|
imbitrrid |
|
25 |
|
df-nel |
|
26 |
25
|
biimpri |
|
27 |
26
|
olcd |
|
28 |
|
wwlksnndef |
|
29 |
27 28
|
syl |
|
30 |
|
0fin |
|
31 |
29 30
|
eqeltrdi |
|
32 |
31
|
a1d |
|
33 |
24 32
|
pm2.61i |
|