Step |
Hyp |
Ref |
Expression |
1 |
|
vex |
|
2 |
1
|
elint2 |
|
3 |
|
elequ2 |
|
4 |
3
|
ralab2 |
|
5 |
|
df-rex |
|
6 |
5
|
imbi1i |
|
7 |
|
19.23v |
|
8 |
|
simpr |
|
9 |
8
|
eleq2d |
|
10 |
9
|
pm5.74i |
|
11 |
1
|
elima |
|
12 |
|
df-br |
|
13 |
12
|
rexbii |
|
14 |
11 13
|
bitri |
|
15 |
14
|
imbi2i |
|
16 |
10 15
|
bitri |
|
17 |
16
|
albii |
|
18 |
6 7 17
|
3bitr2i |
|
19 |
18
|
albii |
|
20 |
|
19.23v |
|
21 |
|
vex |
|
22 |
21
|
imaex |
|
23 |
22
|
isseti |
|
24 |
|
19.42v |
|
25 |
23 24
|
mpbiran2 |
|
26 |
25
|
imbi1i |
|
27 |
20 26
|
bitri |
|
28 |
27
|
albii |
|
29 |
|
alcom |
|
30 |
|
df-ral |
|
31 |
28 29 30
|
3bitr4i |
|
32 |
19 31
|
bitri |
|
33 |
4 32
|
bitri |
|
34 |
2 33
|
bitri |
|