Proof of Theorem axregnd
| Step | Hyp | Ref
| Expression |
| 1 | | hbnae 1145 |
. . . . . 6
⊢ (¬ ∀z z = x → ∀x ¬ ∀z z = x) |
| 2 | | hbnae 1145 |
. . . . . 6
⊢ (¬ ∀z z = y → ∀x ¬ ∀z z = y) |
| 3 | 1, 2 | hban 1007 |
. . . . 5
⊢ ((¬ ∀z z = x ⋀ ¬ ∀z z = y) → ∀x(¬ ∀z z = x ⋀ ¬ ∀z z = y)) |
| 4 | | hbnae 1145 |
. . . . . . . 8
⊢ (¬ ∀z z = x → ∀z ¬ ∀z z = x) |
| 5 | | hbnae 1145 |
. . . . . . . 8
⊢ (¬ ∀z z = y → ∀z ¬ ∀z z = y) |
| 6 | 4, 5 | hban 1007 |
. . . . . . 7
⊢ ((¬ ∀z z = x ⋀ ¬ ∀z z = y) → ∀z(¬ ∀z z = x ⋀ ¬ ∀z z = y)) |
| 7 | | dveel2 1355 |
. . . . . . . . 9
⊢ (¬ ∀z z = x → (w
∈ x → ∀z w ∈
x)) |
| 8 | 7 | adantr 389 |
. . . . . . . 8
⊢ ((¬ ∀z z = x ⋀ ¬ ∀z z = y) → (w
∈ x → ∀z w ∈
x)) |
| 9 | | dveel2 1355 |
. . . . . . . . . 10
⊢ (¬ ∀z z = y → (w
∈ y → ∀z w ∈
y)) |
| 10 | 9 | adantl 388 |
. . . . . . . . 9
⊢ ((¬ ∀z z = x ⋀ ¬ ∀z z = y) → (w
∈ y → ∀z w ∈
y)) |
| 11 | 6, 10 | hbnd 1107 |
. . . . . . . 8
⊢ ((¬ ∀z z = x ⋀ ¬ ∀z z = y) → (¬ w ∈ y
→ ∀z ¬ w ∈ y)) |
| 12 | 6, 8, 11 | hbimd 1108 |
. . . . . . 7
⊢ ((¬ ∀z z = x ⋀ ¬ ∀z z = y) → ((w
∈ x → ¬ w ∈ y)
→ ∀z(w ∈ x
→ ¬ w ∈ y))) |
| 13 | | elequ1 1134 |
. . . . . . . . 9
⊢ (w =
z → (w ∈ x
↔ z ∈ x)) |
| 14 | | elequ1 1134 |
. . . . . . . . . 10
⊢ (w =
z → (w ∈ y
↔ z ∈ y)) |
| 15 | 14 | negbid 610 |
. . . . . . . . 9
⊢ (w =
z → (¬ w ∈ y
↔ ¬ z ∈ y)) |
| 16 | 13, 15 | imbi12d 625 |
. . . . . . . 8
⊢ (w =
z → ((w ∈ x
→ ¬ w ∈ y) ↔ (z
∈ x → ¬ z ∈ y))) |
| 17 | 16 | a1i 8 |
. . . . . . 7
⊢ ((¬ ∀z z = x ⋀ ¬ ∀z z = y) → (w =
z → ((w ∈ x
→ ¬ w ∈ y) ↔ (z
∈ x → ¬ z ∈ y)))) |
| 18 | 6, 12, 17 | cbvald 1318 |
. . . . . 6
⊢ ((¬ ∀z z = x ⋀ ¬ ∀z z = y) → (∀w(w ∈
x → ¬ w ∈ y)
↔ ∀z(z ∈ x
→ ¬ z ∈ y))) |
| 19 | 18 | anbi2d 615 |
. . . . 5
⊢ ((¬ ∀z z = x ⋀ ¬ ∀z z = y) → ((x
∈ y ⋀ ∀w(w ∈
x → ¬ w ∈ y))
↔ (x ∈ y ⋀ ∀z(z ∈
x → ¬ z ∈ y)))) |
| 20 | 3, 19 | exbid 1103 |
. . . 4
⊢ ((¬ ∀z z = x ⋀ ¬ ∀z z = y) → (∃x(x ∈
y ⋀ ∀w(w ∈
x → ¬ w ∈ y))
↔ ∃x(x ∈ y
⋀ ∀z(z ∈ x
→ ¬ z ∈ y)))) |
| 21 | | axregndlem2 4947 |
. . . 4
⊢ (x
∈ y → ∃x(x ∈
y ⋀ ∀w(w ∈
x → ¬ w ∈ y))) |
| 22 | 20, 21 | syl5bi 208 |
. . 3
⊢ ((¬ ∀z z = x ⋀ ¬ ∀z z = y) → (x
∈ y → ∃x(x ∈
y ⋀ ∀z(z ∈
x → ¬ z ∈ y)))) |
| 23 | 22 | ex 373 |
. 2
⊢ (¬ ∀z z = x → (¬ ∀z z = y → (x
∈ y → ∃x(x ∈
y ⋀ ∀z(z ∈
x → ¬ z ∈ y))))) |
| 24 | | axregndlem1 4946 |
. . 3
⊢ (∀x x = z → (x
∈ y → ∃x(x ∈
y ⋀ ∀z(z ∈
x → ¬ z ∈ y)))) |
| 25 | 24 | alequcoms 1141 |
. 2
⊢ (∀z z = x → (x
∈ y → ∃x(x ∈
y ⋀ ∀z(z ∈
x → ¬ z ∈ y)))) |
| 26 | | hbae 1143 |
. . . 4
⊢ (∀z z = y → ∀x∀z
z = y) |
| 27 | | elirrv 4590 |
. . . . . . . . . 10
⊢ ¬ z ∈ z |
| 28 | | elequ2 1135 |
. . . . . . . . . 10
⊢ (z =
y → (z ∈ z
↔ z ∈ y)) |
| 29 | 27, 28 | mtbii 715 |
. . . . . . . . 9
⊢ (z =
y → ¬ z ∈ y) |
| 30 | 29 | a4s 982 |
. . . . . . . 8
⊢ (∀z z = y → ¬ z
∈ y) |
| 31 | 30 | a1d 12 |
. . . . . . 7
⊢ (∀z z = y → (z
∈ x → ¬ z ∈ y)) |
| 32 | 31 | a5i 987 |
. . . . . 6
⊢ (∀z z = y → ∀z(z ∈
x → ¬ z ∈ y)) |
| 33 | 32 | anim2i 335 |
. . . . 5
⊢ ((x
∈ y ⋀ ∀z z = y) → (x
∈ y ⋀ ∀z(z ∈
x → ¬ z ∈ y))) |
| 34 | 33 | expcom 374 |
. . . 4
⊢ (∀z z = y → (x
∈ y → (x ∈ y
⋀ ∀z(z ∈ x
→ ¬ z ∈ y)))) |
| 35 | 26, 34 | 19.22d 1060 |
. . 3
⊢ (∀z z = y → (∃x x ∈
y → ∃x(x ∈
y ⋀ ∀z(z ∈
x → ¬ z ∈ y)))) |
| 36 | | 19.8a 1027 |
. . 3
⊢ (x
∈ y → ∃x x ∈
y) |
| 37 | 35, 36 | syl5 21 |
. 2
⊢ (∀z z = y → (x
∈ y → ∃x(x ∈
y ⋀ ∀z(z ∈
x → ¬ z ∈ y)))) |
| 38 | 23, 25, 37 | pm2.61ii 130 |
1
⊢ (x
∈ y → ∃x(x ∈
y ⋀ ∀z(z ∈
x → ¬ z ∈ y))) |