Step |
Hyp |
Ref |
Expression |
1 |
|
treq |
|
2 |
|
neeq1 |
|
3 |
|
eleq2 |
|
4 |
|
eleq2 |
|
5 |
|
eleq2 |
|
6 |
5
|
raleqbi1dv |
|
7 |
3 4 6
|
3anbi123d |
|
8 |
7
|
raleqbi1dv |
|
9 |
1 2 8
|
3anbi123d |
|
10 |
|
treq |
|
11 |
|
neeq1 |
|
12 |
|
eleq2 |
|
13 |
|
eleq2 |
|
14 |
|
eleq2 |
|
15 |
14
|
raleqbi1dv |
|
16 |
12 13 15
|
3anbi123d |
|
17 |
16
|
raleqbi1dv |
|
18 |
10 11 17
|
3anbi123d |
|
19 |
|
df-wun |
|
20 |
9 18 19
|
elab2gw |
|