Step |
Hyp |
Ref |
Expression |
1 |
|
rexcom4 |
|
2 |
|
rexcom4 |
|
3 |
1 2
|
orbi12i |
|
4 |
|
19.43 |
|
5 |
3 4
|
bitr4i |
|
6 |
5
|
rexbii |
|
7 |
|
rexcom4 |
|
8 |
6 7
|
bitri |
|
9 |
|
simpl |
|
10 |
9
|
exlimiv |
|
11 |
|
elisset |
|
12 |
|
ibar |
|
13 |
12
|
bicomd |
|
14 |
13
|
exbidv |
|
15 |
11 14
|
syl5ibrcom |
|
16 |
10 15
|
impbid2 |
|
17 |
16
|
ralrexbid |
|
18 |
17
|
adantr |
|
19 |
|
simpl |
|
20 |
19
|
exlimiv |
|
21 |
|
elisset |
|
22 |
|
ibar |
|
23 |
22
|
bicomd |
|
24 |
23
|
exbidv |
|
25 |
21 24
|
syl5ibrcom |
|
26 |
20 25
|
impbid2 |
|
27 |
26
|
ralrexbid |
|
28 |
27
|
adantl |
|
29 |
18 28
|
orbi12d |
|
30 |
29
|
ralrexbid |
|
31 |
8 30
|
bitr3id |
|
32 |
|
eqeq1 |
|
33 |
32
|
anbi1d |
|
34 |
33
|
rexbidv |
|
35 |
|
eqeq1 |
|
36 |
35
|
anbi1d |
|
37 |
36
|
rexbidv |
|
38 |
34 37
|
orbi12d |
|
39 |
38
|
rexbidv |
|
40 |
39
|
dmopabelb |
|
41 |
40
|
elv |
|
42 |
|
vex |
|
43 |
32
|
rexbidv |
|
44 |
35
|
rexbidv |
|
45 |
43 44
|
orbi12d |
|
46 |
45
|
rexbidv |
|
47 |
42 46
|
elab |
|
48 |
31 41 47
|
3bitr4g |
|
49 |
48
|
eqrdv |
|