| Step |
Hyp |
Ref |
Expression |
| 1 |
|
axacnd |
|
| 2 |
|
df-an |
|
| 3 |
2
|
albii |
|
| 4 |
|
anass |
|
| 5 |
|
annim |
|
| 6 |
|
pm4.63 |
|
| 7 |
6
|
anbi2i |
|
| 8 |
5 7
|
bitr3i |
|
| 9 |
8
|
anbi2i |
|
| 10 |
|
annim |
|
| 11 |
4 9 10
|
3bitr2i |
|
| 12 |
11
|
exbii |
|
| 13 |
|
exnal |
|
| 14 |
12 13
|
bitri |
|
| 15 |
14
|
bibi1i |
|
| 16 |
|
dfbi1 |
|
| 17 |
15 16
|
bitri |
|
| 18 |
17
|
albii |
|
| 19 |
18
|
exbii |
|
| 20 |
|
df-ex |
|
| 21 |
19 20
|
bitri |
|
| 22 |
3 21
|
imbi12i |
|
| 23 |
22
|
2albii |
|
| 24 |
23
|
exbii |
|
| 25 |
|
df-ex |
|
| 26 |
24 25
|
bitri |
|
| 27 |
1 26
|
mpbi |
|