Step |
Hyp |
Ref |
Expression |
1 |
|
brtxp2.1 |
|
2 |
|
txpss3v |
|
3 |
2
|
brel |
|
4 |
3
|
simprd |
|
5 |
|
elvv |
|
6 |
4 5
|
sylib |
|
7 |
6
|
pm4.71ri |
|
8 |
|
19.41vv |
|
9 |
7 8
|
bitr4i |
|
10 |
|
breq2 |
|
11 |
10
|
pm5.32i |
|
12 |
11
|
2exbii |
|
13 |
|
vex |
|
14 |
|
vex |
|
15 |
1 13 14
|
brtxp |
|
16 |
15
|
anbi2i |
|
17 |
|
3anass |
|
18 |
16 17
|
bitr4i |
|
19 |
18
|
2exbii |
|
20 |
9 12 19
|
3bitri |
|