Step |
Hyp |
Ref |
Expression |
1 |
|
relco |
|
2 |
|
relss |
|
3 |
1 2
|
mpi |
|
4 |
|
elrel |
|
5 |
|
vex |
|
6 |
|
vex |
|
7 |
5 6
|
brco |
|
8 |
6
|
ideq |
|
9 |
8
|
anbi1ci |
|
10 |
9
|
exbii |
|
11 |
|
breq2 |
|
12 |
11
|
equsexvw |
|
13 |
7 10 12
|
3bitri |
|
14 |
13
|
a1i |
|
15 |
|
eleq1 |
|
16 |
|
df-br |
|
17 |
15 16
|
bitr4di |
|
18 |
|
eleq1 |
|
19 |
|
df-br |
|
20 |
18 19
|
bitr4di |
|
21 |
14 17 20
|
3bitr4d |
|
22 |
21
|
exlimivv |
|
23 |
4 22
|
syl |
|
24 |
23
|
pm5.74da |
|
25 |
24
|
albidv |
|
26 |
|
dfss2 |
|
27 |
|
dfss2 |
|
28 |
25 26 27
|
3bitr4g |
|
29 |
3 28
|
biadanii |
|