Step |
Hyp |
Ref |
Expression |
1 |
|
wl-2sb6d.1 |
|
2 |
|
wl-2sb6d.2 |
|
3 |
|
wl-2sb6d.3 |
|
4 |
|
wl-2sb6d.4 |
|
5 |
1 3
|
jca |
|
6 |
|
sb4b |
|
7 |
|
nfnae |
|
8 |
|
wl-nfnae1 |
|
9 |
|
nfnae |
|
10 |
8 9
|
nfan |
|
11 |
7 10
|
nfan |
|
12 |
|
sb4b |
|
13 |
12
|
imbi2d |
|
14 |
|
impexp |
|
15 |
14
|
albii |
|
16 |
|
nfeqf |
|
17 |
|
19.21t |
|
18 |
16 17
|
syl |
|
19 |
15 18
|
bitr2id |
|
20 |
13 19
|
sylan9bb |
|
21 |
11 20
|
albid |
|
22 |
6 21
|
sylan9bb |
|
23 |
4 2 5 22
|
syl12anc |
|