Description: Ordering of real subset of complex numbers in terms of signed reals. (Contributed by NM, 22-Feb-1996) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | ltresr | |
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 | |