| Step |
Hyp |
Ref |
Expression |
| 1 |
|
idn1 |
|
| 2 |
|
sbcor |
|
| 3 |
2
|
a1i |
|
| 4 |
1 3
|
e1a |
|
| 5 |
|
df-3or |
|
| 6 |
5
|
bicomi |
|
| 7 |
6
|
ax-gen |
|
| 8 |
|
spsbc |
|
| 9 |
1 7 8
|
e10 |
|
| 10 |
|
sbcbig |
|
| 11 |
10
|
biimpd |
|
| 12 |
1 9 11
|
e11 |
|
| 13 |
|
bitr3 |
|
| 14 |
13
|
com12 |
|
| 15 |
4 12 14
|
e11 |
|
| 16 |
|
sbcor |
|
| 17 |
16
|
a1i |
|
| 18 |
1 17
|
e1a |
|
| 19 |
|
orbi1 |
|
| 20 |
18 19
|
e1a |
|
| 21 |
|
bibi1 |
|
| 22 |
21
|
biimprd |
|
| 23 |
15 20 22
|
e11 |
|
| 24 |
|
df-3or |
|
| 25 |
24
|
bicomi |
|
| 26 |
|
bibi1 |
|
| 27 |
26
|
biimprd |
|
| 28 |
23 25 27
|
e10 |
|
| 29 |
28
|
in1 |
|