Step |
Hyp |
Ref |
Expression |
1 |
|
fneval.1 |
|
2 |
1
|
breqi |
|
3 |
|
brin |
|
4 |
|
fnerel |
|
5 |
4
|
relbrcnv |
|
6 |
5
|
anbi2i |
|
7 |
3 6
|
bitri |
|
8 |
2 7
|
bitri |
|
9 |
|
eqid |
|
10 |
|
eqid |
|
11 |
9 10
|
isfne4b |
|
12 |
10 9
|
isfne4b |
|
13 |
|
eqcom |
|
14 |
13
|
anbi1i |
|
15 |
12 14
|
syl6bb |
|
16 |
11 15
|
bi2anan9r |
|
17 |
|
eqss |
|
18 |
17
|
anbi2i |
|
19 |
|
anandi |
|
20 |
18 19
|
bitri |
|
21 |
16 20
|
bitr4di |
|
22 |
|
unieq |
|
23 |
|
unitg |
|
24 |
|
unitg |
|
25 |
23 24
|
eqeqan12d |
|
26 |
22 25
|
syl5ib |
|
27 |
26
|
pm4.71rd |
|
28 |
21 27
|
bitr4d |
|
29 |
8 28
|
syl5bb |
|