Proof of Theorem so
| Step | Hyp | Ref
| Expression |
| 1 | | cleqid 1102 |
. . . . 5
⊢ x =
x |
| 2 | | orc 225 |
. . . . 5
⊢ (x =
x → (x = x ∨
xRx)) |
| 3 | 1, 2 | ax-mp 6 |
. . . 4
⊢ (x =
x ∨ xRx) |
| 4 | | eleq1 1149 |
. . . . . . 7
⊢ (y =
x → (y ∈ A
↔ x ∈ A)) |
| 5 | 4 | anbi2d 468 |
. . . . . 6
⊢ (y =
x → ((x ∈ A ∧
y ∈ A) ↔ (x
∈ A ∧ x ∈ A))) |
| 6 | | cleq2 1110 |
. . . . . . . 8
⊢ (y =
x → (x = y ↔
x = x)) |
| 7 | | breq1 2065 |
. . . . . . . 8
⊢ (y =
x → (yRx ↔ xRx)) |
| 8 | 6, 7 | orbi12d 475 |
. . . . . . 7
⊢ (y =
x → ((x = y ∨
yRx) ↔
(x = x
∨ xRx))) |
| 9 | | breq2 2066 |
. . . . . . . 8
⊢ (y =
x → (xRy ↔ xRx)) |
| 10 | 9 | negbid 463 |
. . . . . . 7
⊢ (y =
x → (¬ xRy ↔ ¬ xRx)) |
| 11 | 8, 10 | bibi12d 477 |
. . . . . 6
⊢ (y =
x → (((x = y ∨
yRx) ↔ ¬
xRy) ↔
((x = x
∨ xRx) ↔ ¬
xRx))) |
| 12 | 5, 11 | imbi12d 474 |
. . . . 5
⊢ (y =
x → (((x ∈ A ∧
y ∈ A) → ((x =
y ∨ yRx) ↔ ¬ xRy)) ↔ ((x
∈ A ∧ x ∈ A)
→ ((x = x ∨ xRx) ↔ ¬
xRx)))) |
| 13 | | 3anass 585 |
. . . . . . . 8
⊢ ((x
∈ A ∧ y ∈ A ∧
y ∈ A) ↔ (x
∈ A ∧ (y ∈ A ∧
y ∈ A))) |
| 14 | | anidm 331 |
. . . . . . . . 9
⊢ ((y
∈ A ∧ y ∈ A)
↔ y ∈ A) |
| 15 | 14 | anbi2i 367 |
. . . . . . . 8
⊢ ((x
∈ A ∧ (y ∈ A ∧
y ∈ A)) ↔ (x
∈ A ∧ y ∈ A)) |
| 16 | 13, 15 | bitr2 152 |
. . . . . . 7
⊢ ((x
∈ A ∧ y ∈ A)
↔ (x ∈ A ∧ y ∈
A ∧ y ∈ A)) |
| 17 | | pm4.2i 149 |
. . . . . . . . . 10
⊢ (z =
y → (x ∈ A
↔ x ∈ A)) |
| 18 | | pm4.2i 149 |
. . . . . . . . . 10
⊢ (z =
y → (y ∈ A
↔ y ∈ A)) |
| 19 | | eleq1 1149 |
. . . . . . . . . 10
⊢ (z =
y → (z ∈ A
↔ y ∈ A)) |
| 20 | 17, 18, 19 | bi3and 636 |
. . . . . . . . 9
⊢ (z =
y → ((x ∈ A ∧
y ∈ A ∧ z ∈
A) ↔ (x ∈ A ∧
y ∈ A ∧ y ∈
A))) |
| 21 | 20 | imbi1d 465 |
. . . . . . . 8
⊢ (z =
y → (((x ∈ A ∧
y ∈ A ∧ z ∈
A) → (xRy ↔ ¬ (x = y ∨
yRx))) ↔
((x ∈ A ∧ y ∈
A ∧ y ∈ A)
→ (xRy ↔ ¬
(x = y
∨ yRx))))) |
| 22 | | so.1 |
. . . . . . . . 9
⊢ ((x
∈ A ∧ y ∈ A ∧
z ∈ A) → ((xRy ↔ ¬ (x = y ∨
yRx)) ∧
((xRy ∧
yRz) →
xRz))) |
| 23 | 22 | pm3.26d 258 |
. . . . . . . 8
⊢ ((x
∈ A ∧ y ∈ A ∧
z ∈ A) → (xRy ↔ ¬ (x = y ∨
yRx))) |
| 24 | 21, 23 | chv 984 |
. . . . . . 7
⊢ ((x
∈ A ∧ y ∈ A ∧
y ∈ A) → (xRy ↔ ¬ (x = y ∨
yRx))) |
| 25 | 16, 24 | sylbi 174 |
. . . . . 6
⊢ ((x
∈ A ∧ y ∈ A)
→ (xRy ↔ ¬
(x = y
∨ yRx))) |
| 26 | 25 | bicon2d 404 |
. . . . 5
⊢ ((x
∈ A ∧ y ∈ A)
→ ((x = y ∨ yRx) ↔ ¬
xRy)) |
| 27 | 12, 26 | chv 984 |
. . . 4
⊢ ((x
∈ A ∧ x ∈ A)
→ ((x = x ∨ xRx) ↔ ¬
xRx)) |
| 28 | 3, 27 | mpbii 168 |
. . 3
⊢ ((x
∈ A ∧ x ∈ A)
→ ¬ xRx) |
| 29 | 28 | anidms 332 |
. 2
⊢ (x
∈ A → ¬ xRx) |
| 30 | 22 | pm3.27d 262 |
. 2
⊢ ((x
∈ A ∧ y ∈ A ∧
z ∈ A) → ((xRy ∧ yRz) → xRz)) |
| 31 | 26 | biimprd 136 |
. . 3
⊢ ((x
∈ A ∧ y ∈ A)
→ (¬ xRy →
(x = y
∨ yRx))) |
| 32 | | 3orass 584 |
. . . 4
⊢ ((xRy ∨ x =
y ∨ yRx) ↔ (xRy ∨ (x =
y ∨ yRx))) |
| 33 | | df-or 197 |
. . . 4
⊢ ((xRy ∨ (x =
y ∨ yRx)) ↔ (¬ xRy → (x =
y ∨ yRx))) |
| 34 | 32, 33 | bitr 151 |
. . 3
⊢ ((xRy ∨ x =
y ∨ yRx) ↔ (¬ xRy → (x =
y ∨ yRx))) |
| 35 | 31, 34 | sylibr 175 |
. 2
⊢ ((x
∈ A ∧ y ∈ A)
→ (xRy ∨ x = y ∨
yRx)) |
| 36 | 29, 30, 35 | itlso 2151 |
1
⊢ R Or
A |