Step |
Hyp |
Ref |
Expression |
1 |
|
pwexg |
|
2 |
|
elpw2g |
|
3 |
1 2
|
syl |
|
4 |
3
|
anbi1d |
|
5 |
|
elex |
|
6 |
5
|
biantrurd |
|
7 |
4 6
|
bitr3d |
|
8 |
|
df-fbas |
|
9 |
|
neeq1 |
|
10 |
|
neleq2 |
|
11 |
|
ineq1 |
|
12 |
11
|
neeq1d |
|
13 |
12
|
raleqbi1dv |
|
14 |
13
|
raleqbi1dv |
|
15 |
9 10 14
|
3anbi123d |
|
16 |
15
|
adantl |
|
17 |
|
pweq |
|
18 |
17
|
pweqd |
|
19 |
|
vpwex |
|
20 |
19
|
pwex |
|
21 |
20
|
a1i |
|
22 |
8 16 18 21
|
elmptrab |
|
23 |
|
3anass |
|
24 |
22 23
|
bitri |
|
25 |
7 24
|
syl6rbbr |
|