Step |
Hyp |
Ref |
Expression |
1 |
|
erclwwlkn.w |
|
2 |
|
erclwwlkn.r |
|
3 |
|
df-3an |
|
4 |
|
anidm |
|
5 |
4
|
anbi1i |
|
6 |
3 5
|
bitri |
|
7 |
1 2
|
erclwwlkneq |
|
8 |
7
|
el2v |
|
9 |
|
eqid |
|
10 |
9
|
clwwlknwrd |
|
11 |
|
clwwlknnn |
|
12 |
|
cshw0 |
|
13 |
|
nnnn0 |
|
14 |
|
0elfz |
|
15 |
13 14
|
syl |
|
16 |
|
eqcom |
|
17 |
16
|
biimpi |
|
18 |
|
oveq2 |
|
19 |
18
|
rspceeqv |
|
20 |
15 17 19
|
syl2anr |
|
21 |
20
|
ex |
|
22 |
12 21
|
syl |
|
23 |
10 11 22
|
sylc |
|
24 |
23 1
|
eleq2s |
|
25 |
24
|
pm4.71i |
|
26 |
6 8 25
|
3bitr4ri |
|