Step |
Hyp |
Ref |
Expression |
1 |
|
fnwe2.su |
|
2 |
|
fnwe2.t |
|
3 |
|
vex |
|
4 |
|
vex |
|
5 |
|
fveq2 |
|
6 |
|
fveq2 |
|
7 |
5 6
|
breqan12d |
|
8 |
5 6
|
eqeqan12d |
|
9 |
|
simpl |
|
10 |
|
fvex |
|
11 |
10 1
|
csbie |
|
12 |
5
|
csbeq1d |
|
13 |
11 12
|
eqtr3id |
|
14 |
13
|
adantr |
|
15 |
|
simpr |
|
16 |
9 14 15
|
breq123d |
|
17 |
8 16
|
anbi12d |
|
18 |
7 17
|
orbi12d |
|
19 |
3 4 18 2
|
braba |
|