Proof of Theorem eueq3
| Step | Hyp | Ref
| Expression |
| 1 | | euorv 1025 |
. . . 4
⊢ ((¬ (¬ (φ ∨ ψ) ∨ ψ) ∧ ∃!x(φ ∧
x = A))
→ ∃!x((¬ (φ ∨ ψ) ∨ ψ) ∨ (φ ∧ x
= A))) |
| 2 | | pm2.45 228 |
. . . . . 6
⊢ (¬ (φ ∨ ψ) → ¬ φ) |
| 3 | | eueq3.4 |
. . . . . . . 8
⊢ ¬ (φ ∧ ψ) |
| 4 | | imnan 207 |
. . . . . . . 8
⊢ ((φ → ¬ ψ) ↔ ¬ (φ ∧ ψ)) |
| 5 | 3, 4 | mpbir 165 |
. . . . . . 7
⊢ (φ
→ ¬ ψ) |
| 6 | 5 | con2i 89 |
. . . . . 6
⊢ (ψ
→ ¬ φ) |
| 7 | 2, 6 | jaoi 275 |
. . . . 5
⊢ ((¬ (φ ∨ ψ) ∨ ψ) → ¬ φ) |
| 8 | 7 | con2i 89 |
. . . 4
⊢ (φ
→ ¬ (¬ (φ ∨ ψ) ∨ ψ)) |
| 9 | | eueq3.1 |
. . . . . 6
⊢ A
∈ V |
| 10 | 9 | eueq1 1428 |
. . . . 5
⊢ ∃!x x = A |
| 11 | | euanv 1053 |
. . . . . 6
⊢ (∃!x(φ ∧
x = A)
↔ (φ ∧ ∃!x x = A)) |
| 12 | 11 | biimpr 134 |
. . . . 5
⊢ ((φ ∧ ∃!x x = A) → ∃!x(φ ∧
x = A)) |
| 13 | 10, 12 | mpan2 519 |
. . . 4
⊢ (φ
→ ∃!x(φ ∧ x
= A)) |
| 14 | 1, 8, 13 | sylanc 361 |
. . 3
⊢ (φ
→ ∃!x((¬ (φ ∨ ψ) ∨ ψ) ∨ (φ ∧ x
= A))) |
| 15 | | negb 79 |
. . . . . . . . 9
⊢ ((φ ∨ ψ) → ¬ ¬ (φ ∨ ψ)) |
| 16 | 15 | orci 226 |
. . . . . . . 8
⊢ (φ
→ ¬ ¬ (φ ∨ ψ)) |
| 17 | 16 | bianfd 554 |
. . . . . . 7
⊢ (φ
→ (¬ (φ ∨ ψ) ↔ (¬ (φ ∨ ψ) ∧ x = B))) |
| 18 | 5 | bianfd 554 |
. . . . . . 7
⊢ (φ
→ (ψ ↔ (ψ ∧ x
= C))) |
| 19 | 17, 18 | orbi12d 475 |
. . . . . 6
⊢ (φ
→ ((¬ (φ ∨ ψ) ∨ ψ) ↔ ((¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C)))) |
| 20 | 19 | orbi2d 466 |
. . . . 5
⊢ (φ
→ (((φ ∧ x = A) ∨
(¬ (φ ∨ ψ) ∨ ψ)) ↔ ((φ ∧ x
= A) ∨ ((¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C))))) |
| 21 | | orcom 209 |
. . . . 5
⊢ (((¬ (φ ∨ ψ) ∨ ψ) ∨ (φ ∧ x
= A)) ↔ ((φ ∧ x
= A) ∨ (¬ (φ ∨ ψ) ∨ ψ))) |
| 22 | | 3orass 584 |
. . . . 5
⊢ (((φ ∧ x
= A) ∨ (¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C)) ↔
((φ ∧ x = A) ∨
((¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C)))) |
| 23 | 20, 21, 22 | 3bitr4g 428 |
. . . 4
⊢ (φ
→ (((¬ (φ ∨ ψ) ∨ ψ) ∨ (φ ∧ x
= A)) ↔ ((φ ∧ x
= A) ∨ (¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C)))) |
| 24 | 23 | bieudv 1013 |
. . 3
⊢ (φ
→ (∃!x((¬ (φ ∨ ψ) ∨ ψ) ∨ (φ ∧ x
= A)) ↔ ∃!x((φ ∧
x = A)
∨ (¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C)))) |
| 25 | 14, 24 | mpbid 170 |
. 2
⊢ (φ
→ ∃!x((φ ∧ x
= A) ∨ (¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C))) |
| 26 | | euorv 1025 |
. . . 4
⊢ ((¬ (φ ∨ ¬ (φ ∨ ψ)) ∧ ∃!x(ψ ∧
x = C))
→ ∃!x((φ ∨ ¬ (φ ∨ ψ)) ∨ (ψ ∧ x
= C))) |
| 27 | | pm2.46 229 |
. . . . . 6
⊢ (¬ (φ ∨ ψ) → ¬ ψ) |
| 28 | 5, 27 | jaoi 275 |
. . . . 5
⊢ ((φ ∨ ¬ (φ ∨ ψ)) → ¬ ψ) |
| 29 | 28 | con2i 89 |
. . . 4
⊢ (ψ
→ ¬ (φ ∨ ¬ (φ ∨ ψ))) |
| 30 | | eueq3.3 |
. . . . . 6
⊢ C
∈ V |
| 31 | 30 | eueq1 1428 |
. . . . 5
⊢ ∃!x x = C |
| 32 | | euanv 1053 |
. . . . . 6
⊢ (∃!x(ψ ∧
x = C)
↔ (ψ ∧ ∃!x x = C)) |
| 33 | 32 | biimpr 134 |
. . . . 5
⊢ ((ψ ∧ ∃!x x = C) → ∃!x(ψ ∧
x = C)) |
| 34 | 31, 33 | mpan2 519 |
. . . 4
⊢ (ψ
→ ∃!x(ψ ∧ x
= C)) |
| 35 | 26, 29, 34 | sylanc 361 |
. . 3
⊢ (ψ
→ ∃!x((φ ∨ ¬ (φ ∨ ψ)) ∨ (ψ ∧ x
= C))) |
| 36 | 6 | bianfd 554 |
. . . . . . 7
⊢ (ψ
→ (φ ↔ (φ ∧ x
= A))) |
| 37 | 15 | olci 227 |
. . . . . . . 8
⊢ (ψ
→ ¬ ¬ (φ ∨ ψ)) |
| 38 | 37 | bianfd 554 |
. . . . . . 7
⊢ (ψ
→ (¬ (φ ∨ ψ) ↔ (¬ (φ ∨ ψ) ∧ x = B))) |
| 39 | 36, 38 | orbi12d 475 |
. . . . . 6
⊢ (ψ
→ ((φ ∨ ¬ (φ ∨ ψ)) ↔ ((φ ∧ x
= A) ∨ (¬ (φ ∨ ψ) ∧ x = B)))) |
| 40 | 39 | orbi1d 467 |
. . . . 5
⊢ (ψ
→ (((φ ∨ ¬ (φ ∨ ψ)) ∨ (ψ ∧ x
= C)) ↔ (((φ ∧ x
= A) ∨ (¬ (φ ∨ ψ) ∧ x = B)) ∨
(ψ ∧ x = C)))) |
| 41 | | df-3or 582 |
. . . . 5
⊢ (((φ ∧ x
= A) ∨ (¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C)) ↔
(((φ ∧ x = A) ∨
(¬ (φ ∨ ψ) ∧ x = B)) ∨
(ψ ∧ x = C))) |
| 42 | 40, 41 | syl6bbr 416 |
. . . 4
⊢ (ψ
→ (((φ ∨ ¬ (φ ∨ ψ)) ∨ (ψ ∧ x
= C)) ↔ ((φ ∧ x
= A) ∨ (¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C)))) |
| 43 | 42 | bieudv 1013 |
. . 3
⊢ (ψ
→ (∃!x((φ ∨ ¬ (φ ∨ ψ)) ∨ (ψ ∧ x
= C)) ↔ ∃!x((φ ∧
x = A)
∨ (¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C)))) |
| 44 | 35, 43 | mpbid 170 |
. 2
⊢ (ψ
→ ∃!x((φ ∧ x
= A) ∨ (¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C))) |
| 45 | | eueq3.2 |
. . . . . 6
⊢ B
∈ V |
| 46 | 45 | eueq1 1428 |
. . . . 5
⊢ ∃!x x = B |
| 47 | | euanv 1053 |
. . . . . 6
⊢ (∃!x(¬ (φ
∨ ψ) ∧ x = B) ↔
(¬ (φ ∨ ψ) ∧ ∃!x x = B)) |
| 48 | 47 | biimpr 134 |
. . . . 5
⊢ ((¬ (φ ∨ ψ) ∧ ∃!x x = B) → ∃!x(¬ (φ
∨ ψ) ∧ x = B)) |
| 49 | 46, 48 | mpan2 519 |
. . . 4
⊢ (¬ (φ ∨ ψ) → ∃!x(¬ (φ
∨ ψ) ∧ x = B)) |
| 50 | | euorv 1025 |
. . . 4
⊢ ((¬ (φ ∨ ψ) ∧ ∃!x(¬ (φ
∨ ψ) ∧ x = B)) →
∃!x((φ ∨ ψ) ∨ (¬ (φ ∨ ψ) ∧ x = B))) |
| 51 | 49, 50 | mpdan 527 |
. . 3
⊢ (¬ (φ ∨ ψ) → ∃!x((φ ∨
ψ) ∨ (¬ (φ ∨ ψ) ∧ x = B))) |
| 52 | 2 | bianfd 554 |
. . . . . 6
⊢ (¬ (φ ∨ ψ) → (φ ↔ (φ ∧ x
= A))) |
| 53 | 27 | bianfd 554 |
. . . . . . . 8
⊢ (¬ (φ ∨ ψ) → (ψ ↔ (ψ ∧ x
= C))) |
| 54 | 53 | orbi1d 467 |
. . . . . . 7
⊢ (¬ (φ ∨ ψ) → ((ψ ∨ (¬ (φ ∨ ψ) ∧ x = B)) ↔
((ψ ∧ x = C) ∨
(¬ (φ ∨ ψ) ∧ x = B)))) |
| 55 | | orcom 209 |
. . . . . . 7
⊢ (((ψ ∧ x
= C) ∨ (¬ (φ ∨ ψ) ∧ x = B)) ↔
((¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C))) |
| 56 | 54, 55 | syl6bb 414 |
. . . . . 6
⊢ (¬ (φ ∨ ψ) → ((ψ ∨ (¬ (φ ∨ ψ) ∧ x = B)) ↔
((¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C)))) |
| 57 | 52, 56 | orbi12d 475 |
. . . . 5
⊢ (¬ (φ ∨ ψ) → ((φ ∨ (ψ ∨ (¬ (φ ∨ ψ) ∧ x = B))) ↔
((φ ∧ x = A) ∨
((¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C))))) |
| 58 | | orass 218 |
. . . . 5
⊢ (((φ ∨ ψ) ∨ (¬ (φ ∨ ψ) ∧ x = B)) ↔
(φ ∨ (ψ ∨ (¬ (φ ∨ ψ) ∧ x = B)))) |
| 59 | 57, 58, 22 | 3bitr4g 428 |
. . . 4
⊢ (¬ (φ ∨ ψ) → (((φ ∨ ψ) ∨ (¬ (φ ∨ ψ) ∧ x = B)) ↔
((φ ∧ x = A) ∨
(¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C)))) |
| 60 | 59 | bieudv 1013 |
. . 3
⊢ (¬ (φ ∨ ψ) → (∃!x((φ ∨
ψ) ∨ (¬ (φ ∨ ψ) ∧ x = B)) ↔
∃!x((φ ∧ x
= A) ∨ (¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C)))) |
| 61 | 51, 60 | mpbid 170 |
. 2
⊢ (¬ (φ ∨ ψ) → ∃!x((φ ∧
x = A)
∨ (¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C))) |
| 62 | 25, 44, 61 | ecase3 559 |
1
⊢ ∃!x((φ ∧
x = A)
∨ (¬ (φ ∨ ψ) ∧ x = B) ∨
(ψ ∧ x = C)) |