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 | |