Proof of Theorem axrepnd
| Step | Hyp | Ref
| Expression |
| 1 | | axrepndlem2 4925 |
. . . 4
⊢ (((¬ ∀x x = y ⋀ ¬ ∀x x = z) ⋀ ¬ ∀y y = z) → ∃x(∃y∀z(φ → z = y) →
∀z(z ∈ x
↔ ∃x(x ∈ y
⋀ ∀yφ)))) |
| 2 | | hbnae 1145 |
. . . . . . 7
⊢ (¬ ∀x x = y → ∀x ¬ ∀x x = y) |
| 3 | | hbnae 1145 |
. . . . . . 7
⊢ (¬ ∀x x = z → ∀x ¬ ∀x x = z) |
| 4 | 2, 3 | hban 1007 |
. . . . . 6
⊢ ((¬ ∀x x = y ⋀ ¬ ∀x x = z) → ∀x(¬ ∀x x = y ⋀ ¬ ∀x x = z)) |
| 5 | | hbnae 1145 |
. . . . . 6
⊢ (¬ ∀y y = z → ∀x ¬ ∀y y = z) |
| 6 | 4, 5 | hban 1007 |
. . . . 5
⊢ (((¬ ∀x x = y ⋀ ¬ ∀x x = z) ⋀ ¬ ∀y y = z) → ∀x((¬ ∀x x = y ⋀ ¬ ∀x x = z) ⋀ ¬ ∀y y = z)) |
| 7 | | hbnae 1145 |
. . . . . . . . 9
⊢ (¬ ∀x x = y → ∀z ¬ ∀x x = y) |
| 8 | | hbnae 1145 |
. . . . . . . . 9
⊢ (¬ ∀x x = z → ∀z ¬ ∀x x = z) |
| 9 | 7, 8 | hban 1007 |
. . . . . . . 8
⊢ ((¬ ∀x x = y ⋀ ¬ ∀x x = z) → ∀z(¬ ∀x x = y ⋀ ¬ ∀x x = z)) |
| 10 | | hbnae 1145 |
. . . . . . . 8
⊢ (¬ ∀y y = z → ∀z ¬ ∀y y = z) |
| 11 | 9, 10 | hban 1007 |
. . . . . . 7
⊢ (((¬ ∀x x = y ⋀ ¬ ∀x x = z) ⋀ ¬ ∀y y = z) → ∀z((¬ ∀x x = y ⋀ ¬ ∀x x = z) ⋀ ¬ ∀y y = z)) |
| 12 | | ax-15 1358 |
. . . . . . . . . . . . 13
⊢ (¬ ∀y y = z → (¬ ∀y y = x → (z
∈ x → ∀y z ∈
x))) |
| 13 | 12 | com12 11 |
. . . . . . . . . . . 12
⊢ (¬ ∀y y = x → (¬ ∀y y = z → (z
∈ x → ∀y z ∈
x))) |
| 14 | 13 | nalequcoms 1142 |
. . . . . . . . . . 11
⊢ (¬ ∀x x = y → (¬ ∀y y = z → (z
∈ x → ∀y z ∈
x))) |
| 15 | 14 | imp 350 |
. . . . . . . . . 10
⊢ ((¬ ∀x x = y ⋀ ¬ ∀y y = z) → (z
∈ x → ∀y z ∈
x)) |
| 16 | 15 | adantlr 393 |
. . . . . . . . 9
⊢ (((¬ ∀x x = y ⋀ ¬ ∀x x = z) ⋀ ¬ ∀y y = z) → (z
∈ x → ∀y z ∈
x)) |
| 17 | | ax-4 971 |
. . . . . . . . 9
⊢ (∀y z ∈
x → z ∈ x) |
| 18 | 16, 17 | impbid1 516 |
. . . . . . . 8
⊢ (((¬ ∀x x = y ⋀ ¬ ∀x x = z) ⋀ ¬ ∀y y = z) → (z
∈ x ↔ ∀y z ∈
x)) |
| 19 | | ax-15 1358 |
. . . . . . . . . . . . . 14
⊢ (¬ ∀z z = x → (¬ ∀z z = y → (x
∈ y → ∀z x ∈
y))) |
| 20 | 19 | imp 350 |
. . . . . . . . . . . . 13
⊢ ((¬ ∀z z = x ⋀ ¬ ∀z z = y) → (x
∈ y → ∀z x ∈
y)) |
| 21 | | alequcom 1140 |
. . . . . . . . . . . . . 14
⊢ (∀z z = x → ∀x x = z) |
| 22 | 21 | con3i 98 |
. . . . . . . . . . . . 13
⊢ (¬ ∀x x = z → ¬ ∀z z = x) |
| 23 | | alequcom 1140 |
. . . . . . . . . . . . . 14
⊢ (∀z z = y → ∀y y = z) |
| 24 | 23 | con3i 98 |
. . . . . . . . . . . . 13
⊢ (¬ ∀y y = z → ¬ ∀z z = y) |
| 25 | 20, 22, 24 | syl2an 454 |
. . . . . . . . . . . 12
⊢ ((¬ ∀x x = z ⋀ ¬ ∀y y = z) → (x
∈ y → ∀z x ∈
y)) |
| 26 | 25 | adantll 392 |
. . . . . . . . . . 11
⊢ (((¬ ∀x x = y ⋀ ¬ ∀x x = z) ⋀ ¬ ∀y y = z) → (x
∈ y → ∀z x ∈
y)) |
| 27 | | ax-4 971 |
. . . . . . . . . . 11
⊢ (∀z x ∈
y → x ∈ y) |
| 28 | 26, 27 | impbid1 516 |
. . . . . . . . . 10
⊢ (((¬ ∀x x = y ⋀ ¬ ∀x x = z) ⋀ ¬ ∀y y = z) → (x
∈ y ↔ ∀z x ∈
y)) |
| 29 | 28 | anbi1d 616 |
. . . . . . . . 9
⊢ (((¬ ∀x x = y ⋀ ¬ ∀x x = z) ⋀ ¬ ∀y y = z) → ((x
∈ y ⋀ ∀yφ) ↔
(∀z x ∈ y
⋀ ∀yφ))) |
| 30 | 6, 29 | exbid 1103 |
. . . . . . . 8
⊢ (((¬ ∀x x = y ⋀ ¬ ∀x x = z) ⋀ ¬ ∀y y = z) → (∃x(x ∈
y ⋀ ∀yφ) ↔
∃x(∀z x ∈
y ⋀ ∀yφ))) |
| 31 | 18, 30 | bibi12d 628 |
. . . . . . 7
⊢ (((¬ ∀x x = y ⋀ ¬ ∀x x = z) ⋀ ¬ ∀y y = z) → ((z
∈ x ↔ ∃x(x ∈
y ⋀ ∀yφ)) ↔
(∀y z ∈ x
↔ ∃x(∀z x ∈
y ⋀ ∀yφ)))) |
| 32 | 11, 31 | albid 1102 |
. . . . . 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)))) |
| 33 | 32 | imbi2d 611 |
. . . . 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))))) |
| 34 | 6, 33 | exbid 1103 |
. . . 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))))) |
| 35 | 1, 34 | mpbid 195 |
. . 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)))) |
| 36 | 35 | exp31 376 |
. 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)))))) |
| 37 | | hbae 1143 |
. . . . 5
⊢ (∀x x = y → ∀z∀x
x = y) |
| 38 | | pm5.21 676 |
. . . . . 6
⊢ ((¬ ∀y z ∈
x ⋀ ¬ ∃x(∀z
x ∈ y ⋀ ∀yφ)) →
(∀y z ∈ x
↔ ∃x(∀z x ∈
y ⋀ ∀yφ))) |
| 39 | | nd2 4919 |
. . . . . . 7
⊢ (∀y y = x → ¬ ∀y z ∈
x) |
| 40 | 39 | alequcoms 1141 |
. . . . . 6
⊢ (∀x x = y → ¬ ∀y z ∈
x) |
| 41 | | hbae 1143 |
. . . . . . 7
⊢ (∀x x = y → ∀x∀x
x = y) |
| 42 | | nd3 4920 |
. . . . . . . 8
⊢ (∀x x = y → ¬ ∀z x ∈
y) |
| 43 | 42 | intnanrd 693 |
. . . . . . 7
⊢ (∀x x = y → ¬ (∀z x ∈
y ⋀ ∀yφ)) |
| 44 | 41, 43 | nexd 1100 |
. . . . . 6
⊢ (∀x x = y → ¬ ∃x(∀z
x ∈ y ⋀ ∀yφ)) |
| 45 | 38, 40, 44 | sylanc 471 |
. . . . 5
⊢ (∀x x = y → (∀y z ∈
x ↔ ∃x(∀z
x ∈ y ⋀ ∀yφ))) |
| 46 | 37, 45 | 19.21ai 996 |
. . . 4
⊢ (∀x x = y → ∀z(∀y
z ∈ x ↔ ∃x(∀z
x ∈ y ⋀ ∀yφ))) |
| 47 | 46 | a1d 12 |
. . 3
⊢ (∀x x = y → (∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ⋀ ∀yφ)))) |
| 48 | | 19.8a 1027 |
. . 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)))) |
| 49 | 47, 48 | syl 10 |
. 2
⊢ (∀x x = y → ∃x(∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ⋀ ∀yφ)))) |
| 50 | | hbae 1143 |
. . . . 5
⊢ (∀x x = z → ∀z∀x
x = z) |
| 51 | | nd4 4921 |
. . . . . 6
⊢ (∀x x = z → ¬ ∀y z ∈
x) |
| 52 | | hbae 1143 |
. . . . . . 7
⊢ (∀x x = z → ∀x∀x
x = z) |
| 53 | | nd1 4918 |
. . . . . . . . 9
⊢ (∀z z = x → ¬ ∀z x ∈
y) |
| 54 | 53 | alequcoms 1141 |
. . . . . . . 8
⊢ (∀x x = z → ¬ ∀z x ∈
y) |
| 55 | 54 | intnanrd 693 |
. . . . . . 7
⊢ (∀x x = z → ¬ (∀z x ∈
y ⋀ ∀yφ)) |
| 56 | 52, 55 | nexd 1100 |
. . . . . 6
⊢ (∀x x = z → ¬ ∃x(∀z
x ∈ y ⋀ ∀yφ)) |
| 57 | 38, 51, 56 | sylanc 471 |
. . . . 5
⊢ (∀x x = z → (∀y z ∈
x ↔ ∃x(∀z
x ∈ y ⋀ ∀yφ))) |
| 58 | 50, 57 | 19.21ai 996 |
. . . 4
⊢ (∀x x = z → ∀z(∀y
z ∈ x ↔ ∃x(∀z
x ∈ y ⋀ ∀yφ))) |
| 59 | 58 | a1d 12 |
. . 3
⊢ (∀x x = z → (∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ⋀ ∀yφ)))) |
| 60 | 59, 48 | syl 10 |
. 2
⊢ (∀x x = z → ∃x(∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ⋀ ∀yφ)))) |
| 61 | | hbae 1143 |
. . . . 5
⊢ (∀y y = z → ∀z∀y
y = z) |
| 62 | | nd1 4918 |
. . . . . 6
⊢ (∀y y = z → ¬ ∀y z ∈
x) |
| 63 | | hbae 1143 |
. . . . . . 7
⊢ (∀y y = z → ∀x∀y
y = z) |
| 64 | | nd2 4919 |
. . . . . . . . 9
⊢ (∀z z = y → ¬ ∀z x ∈
y) |
| 65 | 64 | alequcoms 1141 |
. . . . . . . 8
⊢ (∀y y = z → ¬ ∀z x ∈
y) |
| 66 | 65 | intnanrd 693 |
. . . . . . 7
⊢ (∀y y = z → ¬ (∀z x ∈
y ⋀ ∀yφ)) |
| 67 | 63, 66 | nexd 1100 |
. . . . . 6
⊢ (∀y y = z → ¬ ∃x(∀z
x ∈ y ⋀ ∀yφ)) |
| 68 | 38, 62, 67 | sylanc 471 |
. . . . 5
⊢ (∀y y = z → (∀y z ∈
x ↔ ∃x(∀z
x ∈ y ⋀ ∀yφ))) |
| 69 | 61, 68 | 19.21ai 996 |
. . . 4
⊢ (∀y y = z → ∀z(∀y
z ∈ x ↔ ∃x(∀z
x ∈ y ⋀ ∀yφ))) |
| 70 | 69 | a1d 12 |
. . 3
⊢ (∀y y = z → (∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ⋀ ∀yφ)))) |
| 71 | 70, 48 | syl 10 |
. 2
⊢ (∀y y = z → ∃x(∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ⋀ ∀yφ)))) |
| 72 | 36, 49, 60, 71 | pm2.61iii 132 |
1
⊢ ∃x(∃y∀z(φ → z = y) →
∀z(∀y z ∈
x ↔ ∃x(∀z
x ∈ y ⋀ ∀yφ))) |