Step |
Hyp |
Ref |
Expression |
1 |
|
elex |
|
2 |
|
prssi |
|
3 |
|
df2o3 |
|
4 |
|
0ex |
|
5 |
4
|
a1i |
|
6 |
|
1oex |
|
7 |
6
|
a1i |
|
8 |
|
vex |
|
9 |
8
|
a1i |
|
10 |
|
vex |
|
11 |
10
|
a1i |
|
12 |
|
1n0 |
|
13 |
12
|
necomi |
|
14 |
13
|
a1i |
|
15 |
|
id |
|
16 |
5 7 9 11 14 15
|
en2prd |
|
17 |
3 16
|
eqbrtrid |
|
18 |
|
endom |
|
19 |
17 18
|
syl |
|
20 |
|
domssr |
|
21 |
20
|
3expib |
|
22 |
2 19 21
|
syl2ani |
|
23 |
22
|
expd |
|
24 |
23
|
rexlimdvv |
|
25 |
1 24
|
syl |
|
26 |
25
|
imp |
|