Step |
Hyp |
Ref |
Expression |
1 |
|
ltrelre |
|
2 |
1
|
brel |
|
3 |
|
opelreal |
|
4 |
|
opelreal |
|
5 |
3 4
|
anbi12i |
|
6 |
2 5
|
sylib |
|
7 |
|
ltrelsr |
|
8 |
7
|
brel |
|
9 |
|
opex |
|
10 |
|
opex |
|
11 |
|
eleq1 |
|
12 |
11
|
anbi1d |
|
13 |
|
eqeq1 |
|
14 |
13
|
anbi1d |
|
15 |
14
|
anbi1d |
|
16 |
15
|
2exbidv |
|
17 |
12 16
|
anbi12d |
|
18 |
|
eleq1 |
|
19 |
18
|
anbi2d |
|
20 |
|
eqeq1 |
|
21 |
20
|
anbi2d |
|
22 |
21
|
anbi1d |
|
23 |
22
|
2exbidv |
|
24 |
19 23
|
anbi12d |
|
25 |
|
df-lt |
|
26 |
9 10 17 24 25
|
brab |
|
27 |
26
|
baib |
|
28 |
|
vex |
|
29 |
28
|
eqresr |
|
30 |
|
eqcom |
|
31 |
|
eqcom |
|
32 |
29 30 31
|
3bitr4i |
|
33 |
|
vex |
|
34 |
33
|
eqresr |
|
35 |
|
eqcom |
|
36 |
|
eqcom |
|
37 |
34 35 36
|
3bitr4i |
|
38 |
32 37
|
anbi12i |
|
39 |
28 33
|
opth2 |
|
40 |
38 39
|
bitr4i |
|
41 |
40
|
anbi1i |
|
42 |
41
|
2exbii |
|
43 |
27 42
|
bitrdi |
|
44 |
3 4 43
|
syl2anbr |
|
45 |
|
breq12 |
|
46 |
45
|
copsex2g |
|
47 |
44 46
|
bitrd |
|
48 |
6 8 47
|
pm5.21nii |
|