Proof of Theorem axrepnd
| Step | Hyp | Ref
| Expression |
| 1 | | axrepndlem2 3739 |
. . . 4
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → ∃x(∃y∀z(φ → z = y) →
∀z(z ∈ x
↔ ∃x(x ∈ y ∧
∀yφ)))) |
| 2 | | eq6 826 |
. . . . . . 7
⊢ (¬ ∀x x = y → ∀x ¬ ∀x x = y) |
| 3 | | eq6 826 |
. . . . . . 7
⊢ (¬ ∀x x = z → ∀x ¬ ∀x x = z) |
| 4 | 2, 3 | hban 704 |
. . . . . 6
⊢ ((¬ ∀x x = y ∧ ¬ ∀x x = z) → ∀x(¬ ∀x x = y ∧ ¬ ∀x x = z)) |
| 5 | | eq6 826 |
. . . . . 6
⊢ (¬ ∀y y = z → ∀x ¬ ∀y y = z) |
| 6 | 4, 5 | hban 704 |
. . . . 5
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → ∀x((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z)) |
| 7 | | eq6 826 |
. . . . . . . . 9
⊢ (¬ ∀x x = y → ∀z ¬ ∀x x = y) |
| 8 | | eq6 826 |
. . . . . . . . 9
⊢ (¬ ∀x x = z → ∀z ¬ ∀x x = z) |
| 9 | 7, 8 | hban 704 |
. . . . . . . 8
⊢ ((¬ ∀x x = y ∧ ¬ ∀x x = z) → ∀z(¬ ∀x x = y ∧ ¬ ∀x x = z)) |
| 10 | | eq6 826 |
. . . . . . . 8
⊢ (¬ ∀y y = z → ∀z ¬ ∀y y = z) |
| 11 | 9, 10 | hban 704 |
. . . . . . 7
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → ∀z((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z)) |
| 12 | | ax15 1006 |
. . . . . . . . . . . . 13
⊢ (¬ ∀y y = z → (¬ ∀y y = x → (z
∈ x → ∀y z ∈
x))) |
| 13 | 12 | com12 13 |
. . . . . . . . . . . 12
⊢ (¬ ∀y y = x → (¬ ∀y y = z → (z
∈ x → ∀y z ∈
x))) |
| 14 | 13 | eq4ds 823 |
. . . . . . . . . . 11
⊢ (¬ ∀x x = y → (¬ ∀y y = z → (z
∈ x → ∀y z ∈
x))) |
| 15 | 14 | imp 277 |
. . . . . . . . . 10
⊢ ((¬ ∀x x = y ∧ ¬ ∀y y = z) → (z
∈ x → ∀y z ∈
x)) |
| 16 | 15 | adantlr 310 |
. . . . . . . . 9
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → (z
∈ x → ∀y z ∈
x)) |
| 17 | | ax-4 673 |
. . . . . . . . . 10
⊢ (∀y z ∈
x → z ∈ x) |
| 18 | 17 | a1i 7 |
. . . . . . . . 9
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → (∀y z ∈
x → z ∈ x)) |
| 19 | 16, 18 | impbid 397 |
. . . . . . . 8
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → (z
∈ x ↔ ∀y z ∈
x)) |
| 20 | | ax15 1006 |
. . . . . . . . . . . . . 14
⊢ (¬ ∀z z = x → (¬ ∀z z = y → (x
∈ y → ∀z x ∈
y))) |
| 21 | 20 | imp 277 |
. . . . . . . . . . . . 13
⊢ ((¬ ∀z z = x ∧ ¬ ∀z z = y) → (x
∈ y → ∀z x ∈
y)) |
| 22 | | eq4 821 |
. . . . . . . . . . . . . 14
⊢ (∀z z = x → ∀x x = z) |
| 23 | 22 | con3i 90 |
. . . . . . . . . . . . 13
⊢ (¬ ∀x x = z → ¬ ∀z z = x) |
| 24 | | eq4 821 |
. . . . . . . . . . . . . 14
⊢ (∀z z = y → ∀y y = z) |
| 25 | 24 | con3i 90 |
. . . . . . . . . . . . 13
⊢ (¬ ∀y y = z → ¬ ∀z z = y) |
| 26 | 21, 23, 25 | syl2an 349 |
. . . . . . . . . . . 12
⊢ ((¬ ∀x x = z ∧ ¬ ∀y y = z) → (x
∈ y → ∀z x ∈
y)) |
| 27 | 26 | adantll 309 |
. . . . . . . . . . 11
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → (x
∈ y → ∀z x ∈
y)) |
| 28 | | ax-4 673 |
. . . . . . . . . . . 12
⊢ (∀z x ∈
y → x ∈ y) |
| 29 | 28 | a1i 7 |
. . . . . . . . . . 11
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → (∀z x ∈
y → x ∈ y)) |
| 30 | 27, 29 | impbid 397 |
. . . . . . . . . 10
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → (x
∈ y ↔ ∀z x ∈
y)) |
| 31 | 30 | anbi1d 469 |
. . . . . . . . 9
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → ((x
∈ y ∧ ∀yφ) ↔
(∀z x ∈ y ∧
∀yφ))) |
| 32 | 6, 31 | biexd 783 |
. . . . . . . 8
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → (∃x(x ∈
y ∧ ∀yφ) ↔
∃x(∀z x ∈
y ∧ ∀yφ))) |
| 33 | 19, 32 | bibi12d 477 |
. . . . . . 7
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → ((z
∈ x ↔ ∃x(x ∈
y ∧ ∀yφ)) ↔
(∀y z ∈ x
↔ ∃x(∀z x ∈
y ∧ ∀yφ)))) |
| 34 | 11, 33 | biald 782 |
. . . . . 6
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → (∀z(z ∈
x ↔ ∃x(x ∈
y ∧ ∀yφ)) ↔
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ)))) |
| 35 | 34 | imbi2d 464 |
. . . . 5
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → ((∃y∀z(φ → z = y) →
∀z(z ∈ x
↔ ∃x(x ∈ y ∧
∀yφ))) ↔ (∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ))))) |
| 36 | 6, 35 | biexd 783 |
. . . 4
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → (∃x(∃y∀z(φ → z = y) →
∀z(z ∈ x
↔ ∃x(x ∈ y ∧
∀yφ))) ↔ ∃x(∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ))))) |
| 37 | 1, 36 | mpbid 170 |
. . 3
⊢ (((¬ ∀x x = y ∧ ¬ ∀x x = z) ∧ ¬ ∀y y = z) → ∃x(∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ)))) |
| 38 | 37 | exp31 293 |
. 2
⊢ (¬ ∀x x = y → (¬ ∀x x = z → (¬ ∀y y = z → ∃x(∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ)))))) |
| 39 | | eq5 824 |
. . . . 5
⊢ (∀x x = y → ∀z∀x
x = y) |
| 40 | | pm5.21 502 |
. . . . . 6
⊢ ((¬ ∀y z ∈
x ∧ ¬ ∃x(∀z
x ∈ y ∧ ∀yφ)) →
(∀y z ∈ x
↔ ∃x(∀z x ∈
y ∧ ∀yφ))) |
| 41 | | nd2 3733 |
. . . . . . 7
⊢ (∀y y = x → ¬ ∀y z ∈
x) |
| 42 | 41 | eq4s 822 |
. . . . . 6
⊢ (∀x x = y → ¬ ∀y z ∈
x) |
| 43 | | eq5 824 |
. . . . . . 7
⊢ (∀x x = y → ∀x∀x
x = y) |
| 44 | | nd3 3734 |
. . . . . . . 8
⊢ (∀x x = y → ¬ ∀z x ∈
y) |
| 45 | | pm3.26 256 |
. . . . . . . 8
⊢ ((∀z x ∈
y ∧ ∀yφ) →
∀z x ∈ y) |
| 46 | 44, 45 | šsyl 102 |
. . . . . . 7
⊢ (∀x x = y → ¬ (∀z x ∈
y ∧ ∀yφ)) |
| 47 | 43, 46 | nexd 780 |
. . . . . 6
⊢ (∀x x = y → ¬ ∃x(∀z
x ∈ y ∧ ∀yφ)) |
| 48 | 40, 42, 47 | sylanc 361 |
. . . . 5
⊢ (∀x x = y → (∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ))) |
| 49 | 39, 48 | 19.21ai 740 |
. . . 4
⊢ (∀x x = y → ∀z(∀y
z ∈ x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ))) |
| 50 | 49 | a1d 14 |
. . 3
⊢ (∀x x = y → (∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ)))) |
| 51 | | 19.8a 712 |
. . 3
⊢ ((∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ))) →
∃x(∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ)))) |
| 52 | 50, 51 | syl 12 |
. 2
⊢ (∀x x = y → ∃x(∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ)))) |
| 53 | | eq5 824 |
. . . . 5
⊢ (∀x x = z → ∀z∀x
x = z) |
| 54 | | nd4 3735 |
. . . . . 6
⊢ (∀x x = z → ¬ ∀y z ∈
x) |
| 55 | | eq5 824 |
. . . . . . 7
⊢ (∀x x = z → ∀x∀x
x = z) |
| 56 | &nbs<; | nd1 3732 |
. . . . . . . . 9
⊢ (∀z z/I> = x → ¬ ∀z x ∈
y) |
| 57 | 56 | eq4s 822 |
. . . . . . . 8
⊢ (∀x x = z → ¬ ∀z x ∈
y) |
| 58 | 57, 45 | nsyl 102 |
. . . . . . 7
⊢ (∀x x = z → ¬ (∀z x ∈
y ∧ ∀yφ)) |
| 59 | 55, 58 | nexd 780 |
. . . . . 6
⊢ (∀x x = z → ¬ ∃x(∀z
x ∈ y ∧ ∀yφ)) |
| 60 | 40, 54, 59 | sylanc 361 |
. . . . 5
⊢ (∀x x = z → (∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ))) |
| 61 | 53, 60 | 19.21ai 740 |
. . . 4
⊢ (∀x x = z → ∀z(∀y
z ∈ x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ))) |
| 62 | 61 | a1d 14 |
. . 3
⊢ (∀x x = z → (∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ)))) |
| 63 | 62, 51 | syl 12 |
. 2
⊢ (∀x x = z → ∃x(∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ)))) |
| 64 | | eq5 824 |
. . . . 5
⊢ (∀y y = z → ∀z∀y
y = z) |
| 65 | | nd1 3732 |
. . . . . 6
⊢ (∀y y = z → ¬ ∀y z ∈
x) |
| 66 | | eq5 824 |
. . . . . . 7
⊢ (∀y y = z → ∀x∀y
y = z) |
| 67 | | nd2 3733 |
. . . . . . . . 9
⊢ (∀z z = y → ¬ ∀z x ∈
y) |
| 68 | 67 | eq4s 822 |
. . . . . . . 8
⊢ (∀y y = z → ¬ ∀z x ∈
y) |
| 69 | 68, 45 | nsyl 102 |
. . . . . . 7
⊢ (∀y y = z → ¬ (∀z x ∈
y ∧ ∀yφ)) |
| 70 | 66, 69 | nexd 780 |
. . . . . 6
⊢ (∀y y = z → ¬ ∃x(∀z
x ∈ y ∧ ∀yφ)) |
| 71 | 40, 65, 70 | sylanc 361 |
. . . . 5
⊢ (∀y y = z → (∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ))) |
| 72 | 64, 71 | 19.21ai 740 |
. . . 4
⊢ (∀y y = z → ∀z(∀y
z ∈ x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ))) |
| 73 | 72 | a1d 14 |
. . 3
⊢ (∀y y = z → (∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ)))) |
| 74 | 73, 51 | syl 12 |
. 2
⊢ (∀y y = z → ∃x(∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ)))) |
| 75 | 38, 52, 63, 74 | pm2.61iii 114 |
1
⊢ ∃x(∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ∧ ∀yφ))) |