| Step |
Hyp |
Ref |
Expression |
| 1 |
|
idn1 |
|
| 2 |
|
simp1 |
|
| 3 |
1 2
|
e1a |
|
| 4 |
|
simp2 |
|
| 5 |
1 4
|
e1a |
|
| 6 |
|
pm4.39 |
|
| 7 |
6
|
ex |
|
| 8 |
3 5 7
|
e11 |
|
| 9 |
|
simp3 |
|
| 10 |
1 9
|
e1a |
|
| 11 |
|
pm4.39 |
|
| 12 |
11
|
ex |
|
| 13 |
8 10 12
|
e11 |
|
| 14 |
|
df-3or |
|
| 15 |
14
|
bicomi |
|
| 16 |
|
bitr3 |
|
| 17 |
16
|
com12 |
|
| 18 |
13 15 17
|
e10 |
|
| 19 |
|
df-3or |
|
| 20 |
19
|
bicomi |
|
| 21 |
|
bitr |
|
| 22 |
21
|
ex |
|
| 23 |
18 20 22
|
e10 |
|
| 24 |
23
|
in1 |
|