Step |
Hyp |
Ref |
Expression |
1 |
|
dtru |
|
2 |
|
exnal |
|
3 |
1 2
|
mpbir |
|
4 |
|
nfe1 |
|
5 |
|
axpownd |
|
6 |
4 5
|
exlimi |
|
7 |
3 6
|
ax-mp |
|
8 |
|
19.9v |
|
9 |
|
19.3v |
|
10 |
8 9
|
imbi12i |
|
11 |
10
|
albii |
|
12 |
11
|
imbi1i |
|
13 |
12
|
albii |
|
14 |
13
|
exbii |
|
15 |
7 14
|
mpbi |
|
16 |
|
elequ1 |
|
17 |
|
elequ1 |
|
18 |
16 17
|
imbi12d |
|
19 |
18
|
cbvalvw |
|
20 |
19
|
imbi1i |
|
21 |
20
|
albii |
|
22 |
21
|
exbii |
|
23 |
15 22
|
mpbir |
|