Step |
Hyp |
Ref |
Expression |
1 |
|
metcld.2 |
|
2 |
1
|
metcld |
|
3 |
|
19.23v |
|
4 |
|
vex |
|
5 |
4
|
elima2 |
|
6 |
|
id |
|
7 |
|
elfvdm |
|
8 |
|
ssexg |
|
9 |
6 7 8
|
syl2anr |
|
10 |
|
nnex |
|
11 |
|
elmapg |
|
12 |
9 10 11
|
sylancl |
|
13 |
12
|
anbi1d |
|
14 |
13
|
exbidv |
|
15 |
5 14
|
bitr2id |
|
16 |
15
|
imbi1d |
|
17 |
3 16
|
syl5bb |
|
18 |
17
|
albidv |
|
19 |
|
dfss2 |
|
20 |
18 19
|
bitr4di |
|
21 |
2 20
|
bitrd |
|