Step |
Hyp |
Ref |
Expression |
1 |
|
neifg.1 |
|
2 |
1
|
opnfbas |
|
3 |
|
fgval |
|
4 |
2 3
|
syl |
|
5 |
|
pweq |
|
6 |
5
|
ineq2d |
|
7 |
6
|
neeq1d |
|
8 |
7
|
elrab |
|
9 |
|
velpw |
|
10 |
9
|
a1i |
|
11 |
|
n0 |
|
12 |
|
elin |
|
13 |
|
sseq2 |
|
14 |
13
|
elrab |
|
15 |
|
velpw |
|
16 |
14 15
|
anbi12i |
|
17 |
12 16
|
bitri |
|
18 |
17
|
exbii |
|
19 |
11 18
|
bitri |
|
20 |
19
|
a1i |
|
21 |
10 20
|
anbi12d |
|
22 |
|
anass |
|
23 |
22
|
exbii |
|
24 |
|
df-rex |
|
25 |
23 24
|
bitr4i |
|
26 |
25
|
anbi2i |
|
27 |
1
|
isnei |
|
28 |
27
|
3adant3 |
|
29 |
26 28
|
bitr4id |
|
30 |
21 29
|
bitrd |
|
31 |
8 30
|
syl5bb |
|
32 |
31
|
eqrdv |
|
33 |
4 32
|
eqtrd |
|