Step |
Hyp |
Ref |
Expression |
1 |
|
brcup.1 |
|
2 |
|
brcup.2 |
|
3 |
|
brcup.3 |
|
4 |
|
opex |
|
5 |
|
df-cup |
|
6 |
1 2
|
opelvv |
|
7 |
|
brxp |
|
8 |
6 3 7
|
mpbir2an |
|
9 |
|
epel |
|
10 |
|
vex |
|
11 |
10 4
|
brcnv |
|
12 |
1 2
|
br1steq |
|
13 |
11 12
|
bitri |
|
14 |
9 13
|
anbi12ci |
|
15 |
14
|
exbii |
|
16 |
|
vex |
|
17 |
16 4
|
brco |
|
18 |
1
|
clel3 |
|
19 |
15 17 18
|
3bitr4i |
|
20 |
10 4
|
brcnv |
|
21 |
1 2
|
br2ndeq |
|
22 |
20 21
|
bitri |
|
23 |
9 22
|
anbi12ci |
|
24 |
23
|
exbii |
|
25 |
16 4
|
brco |
|
26 |
2
|
clel3 |
|
27 |
24 25 26
|
3bitr4i |
|
28 |
19 27
|
orbi12i |
|
29 |
|
brun |
|
30 |
|
elun |
|
31 |
28 29 30
|
3bitr4ri |
|
32 |
4 3 5 8 31
|
brtxpsd3 |
|