Description: Lemma for isvcOLD . (Contributed by NM, 31-May-2008) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypothesis | isvclem.1 | |
|
Assertion | isvclem | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | isvclem.1 | |
|
2 | df-vc | |
|
3 | 2 | eleq2i | |
4 | eleq1 | |
|
5 | rneq | |
|
6 | 5 1 | eqtr4di | |
7 | xpeq2 | |
|
8 | 7 | feq2d | |
9 | feq3 | |
|
10 | 8 9 | bitrd | |
11 | 6 10 | syl | |
12 | oveq | |
|
13 | 12 | oveq2d | |
14 | oveq | |
|
15 | 13 14 | eqeq12d | |
16 | 6 15 | raleqbidv | |
17 | oveq | |
|
18 | 17 | eqeq2d | |
19 | 18 | anbi1d | |
20 | 19 | ralbidv | |
21 | 16 20 | anbi12d | |
22 | 21 | ralbidv | |
23 | 22 | anbi2d | |
24 | 6 23 | raleqbidv | |
25 | 4 11 24 | 3anbi123d | |
26 | feq1 | |
|
27 | oveq | |
|
28 | 27 | eqeq1d | |
29 | oveq | |
|
30 | oveq | |
|
31 | oveq | |
|
32 | 30 31 | oveq12d | |
33 | 29 32 | eqeq12d | |
34 | 33 | ralbidv | |
35 | oveq | |
|
36 | oveq | |
|
37 | 30 36 | oveq12d | |
38 | 35 37 | eqeq12d | |
39 | oveq | |
|
40 | oveq | |
|
41 | 36 | oveq2d | |
42 | 40 41 | eqtrd | |
43 | 39 42 | eqeq12d | |
44 | 38 43 | anbi12d | |
45 | 44 | ralbidv | |
46 | 34 45 | anbi12d | |
47 | 46 | ralbidv | |
48 | 28 47 | anbi12d | |
49 | 48 | ralbidv | |
50 | 26 49 | 3anbi23d | |
51 | 25 50 | opelopabg | |
52 | 3 51 | bitrid | |