Proof of Theorem caoprord
| Step | Hyp | Ref
| Expression |
| 1 | | opreq1 3006 |
. . . 4
⊢ (z =
C → (zFA) = (CFA)) |
| 2 | | opreq1 3006 |
. . . 4
⊢ (z =
C → (zFB) = (CFB)) |
| 3 | 1, 2 | breq12d 2073 |
. . 3
⊢ (z =
C → ((zFA)R(zFB) ↔ (CFA)R(CFB))) |
| 4 | 3 | bibi2d 470 |
. 2
⊢ (z =
C → ((ARB ↔ (zFA)R(zFB)) ↔ (ARB ↔ (CFA)R(CFB)))) |
| 5 | | caoprord.1 |
. . 3
⊢ A
∈ V |
| 6 | | caoprord.2 |
. . 3
⊢ B
∈ V |
| 7 | | breq1 2065 |
. . . . . 6
⊢ (x =
A → (xRy ↔ ARy)) |
| 8 | | opreq2 3007 |
. . . . . . 7
⊢ (x =
A → (zFx) = (zFA)) |
| 9 | 8 | breq1d 2071 |
. . . . . 6
⊢ (x =
A → ((zFx)R(zFy) ↔ (zFA)R(zFy))) |
| 10 | 7, 9 | bibi12d 477 |
. . . . 5
⊢ (x =
A → ((xRy ↔ (zFx)R(zFy)) ↔ (ARy ↔ (zFA)R(zFy)))) |
| 11 | | breq2 2066 |
. . . . . 6
⊢ (y =
B → (ARy ↔ ARB)) |
| 12 | | opreq2 3007 |
. . . . . . 7
⊢ (y =
B → (zFy) = (zFB)) |
| 13 | 12 | breq2d 2072 |
. . . . . 6
⊢ (y =
B → ((zFA)R(zFy) ↔ (zFA)R(zFB))) |
| 14 | 11, 13 | bibi12d 477 |
. . . . 5
⊢ (y =
B → ((ARy ↔ (zFA)R(zFy)) ↔ (ARB ↔ (zFA)R(zFB)))) |
| 15 | 10, 14 | sylan9bb 418 |
. . . 4
⊢ ((x =
A ∧ y = B) →
((xRy ↔
(zFx)R(zFy)) ↔
(ARB ↔
(zFA)R(zFB)))) |
| 16 | 15 | imbi2d 464 |
. . 3
⊢ ((x =
A ∧ y = B) →
((z ∈ S → (xRy ↔ (zFx)R(zFy))) ↔ (z
∈ S → (ARB ↔ (zFA)R(zFB))))) |
| 17 | | caoprord.3 |
. . 3
⊢ (z
∈ S → (xRy ↔ (zFx)R(zFy))) |
| 18 | 5, 6, 16, 17 | vtocl2 1379 |
. 2
⊢ (z
∈ S → (ARB ↔ (zFA)R(zFB))) |
| 19 | 4, 18 | vtoclga 1387 |
1
⊢ (C
∈ S → (ARB ↔ (CFA)R(CFB))) |