Proof of Theorem kmlem10
| Step | Hyp | Ref
| Expression |
| 1 | | snssi 1851 |
. . . . . . 7
⊢ (z
∈ x → {z} ⊆ x) |
| 2 | | ssequn1 1628 |
. . . . . . 7
⊢ ({z}
⊆ x ↔ ({z} ∪ x) =
x) |
| 3 | 1, 2 | sylib 173 |
. . . . . 6
⊢ (z
∈ x → ({z} ∪ x) =
x) |
| 4 | | undif2 1762 |
. . . . . 6
⊢ ({z}
∪ (x ∖ {z})) = ({z}
∪ x) |
| 5 | 3, 4 | syl5req 1137 |
. . . . 5
⊢ (z
∈ x → x = ({z} ∪
(x ∖ {z}))) |
| 6 | | iuneq1 2003 |
. . . . 5
⊢ (x =
({z} ∪ (x ∖ {z}))
→ ∪t ∈
x (z
∩ (t ∖ ∪(x ∖ {t}))) = ∪t ∈ ({z}
∪ (x ∖ {z}))(z ∩
(t ∖ ∪(x ∖ {t})))) |
| 7 | 5, 6 | syl 12 |
. . . 4
⊢ (z
∈ x → ∪t ∈ x (z ∩
(t ∖ ∪(x ∖ {t}))) = ∪t ∈ ({z}
∪ (x ∖ {z}))(z ∩
(t ∖ ∪(x ∖ {t})))) |
| 8 | | kmlem4 3583 |
. . . . . . . . . . . 12
⊢ ((z
∈ x ∧ ¬ t = z) →
((t ∖ ∪(x ∖ {t})) ∩ z) =
∅) |
| 9 | | incom 1636 |
. . . . . . . . . . . 12
⊢ (z
∩ (t ∖ ∪(x ∖ {t}))) = ((t
∖ ∪(x
∖ {t})) ∩ z) |
| 10 | 8, 9 | syl5eq 1136 |
. . . . . . . . . . 11
⊢ ((z
∈ x ∧ ¬ t = z) →
(z ∩ (t ∖ ∪(x ∖ {t})))
= ∅) |
| 11 | 10 | exp 291 |
. . . . . . . . . 10
⊢ (z
∈ x → (¬ t = z →
(z ∩ (t ∖ ∪(x ∖ {t})))
= ∅)) |
| 12 | | eldifn 1592 |
. . . . . . . . . . 11
⊢ (t
∈ (x ∖ {z}) → ¬ t ∈ {z}) |
| 13 | | elsn 1820 |
. . . . . . . . . . . 12
⊢ (t
∈ {z} ↔ t = z) |
| 14 | 13 | negbii 162 |
. . . . . . . . . . 11
⊢ (¬ t ∈ {z}
↔ ¬ t = z) |
| 15 | 12, 14 | sylib 173 |
. . . . . . . . . 10
⊢ (t
∈ (x ∖ {z}) → ¬ t = z) |
| 16 | 11, 15 | syl5 22 |
. . . . . . . . 9
⊢ (z
∈ x → (t ∈ (x
∖ {z}) → (z ∩ (t
∖ ∪(x
∖ {t}))) = ∅)) |
| 17 | 16 | r19.21aiv 1259 |
. . . . . . . 8
⊢ (z
∈ x → ∀t ∈ (x
∖ {z})(z ∩ (t
∖ ∪(x
∖ {t}))) = ∅) |
| 18 | | iuneq2 2006 |
. . . . . . . 8
⊢ (∀t ∈ (x
∖ {z})(z ∩ (t
∖ ∪(x
∖ {t}))) = ∅ → ∪t ∈ (x ∖ {z})(z ∩
(t ∖ ∪(x ∖ {t}))) = ∪t ∈ (x
∖ {z})∅) |
| 19 | 17, 18 | syl 12 |
. . . . . . 7
⊢ (z
∈ x → ∪t ∈ (x ∖ {z})(z ∩
(t ∖ ∪(x ∖ {t}))) = ∪t ∈ (x
∖ {z})∅) |
| 20 | | iun0 2028 |
. . . . . . 7
⊢ ∪t ∈ (x
∖ {z})∅ = ∅ |
| 21 | 19, 20 | syl6eq 1140 |
. . . . . 6
⊢ (z
∈ x → ∪t ∈ (x ∖ {z})(z ∩
(t ∖ ∪(x ∖ {t}))) = ∅) |
| 22 | 21 | uneq2d 1611 |
. . . . 5
⊢ (z
∈ x → ((z ∩ (z
∖ ∪(x
∖ {z}))) ∪ ∪t ∈ (x ∖ {z})(z ∩
(t ∖ ∪(x ∖ {t})))) = ((z
∩ (z ∖ ∪(x ∖ {z}))) ∪ ∅)) |
| 23 | | iunxun 2035 |
. . . . . 6
⊢ ∪t ∈ ({z}
∪ (x ∖ {z}))(z ∩
(t ∖ ∪(x ∖ {t}))) = (∪t ∈ {z}
(z ∩ (t ∖ ∪(x ∖ {t})))
∪ ∪t ∈
(x ∖ {z})(z ∩
(t ∖ ∪(x ∖ {t})))) |
| 24 | | visset 1350 |
. . . . . . . 8
⊢ z
∈ V |
| 25 | | difeq1 1582 |
. . . . . . . . . 10
⊢ (t =
z → (t ∖ ∪(x ∖ {t}))
= (z ∖ ∪(x ∖ {t}))) |
| 26 | | sneq 1816 |
. . . . . . . . . . . . 13
⊢ (t =
z → {t} = {z}) |
| 27 | 26 | difeq2d 1588 |
. . . . . . . . . . . 12
⊢ (t =
z → (x ∖ {t}) =
(x ∖ {z})) |
| 28 | 27 | unieqd 1929 |
. . . . . . . . . . 11
⊢ (t =
z → ∪(x ∖ {t}) = ∪(x ∖ {z})) |
| 29 | 28 | difeq2d 1588 |
. . . . . . . . . 10
⊢ (t =
z → (z ∖ ∪(x ∖ {t}))
= (z ∖ ∪(x ∖ {z}))) |
| 30 | 25, 29 | eqtrd 1128 |
. . . . . . . . 9
⊢ (t =
z → (t ∖ ∪(x ∖ {t}))
= (z ∖ ∪(x ∖ {z}))) |
| 31 | 30 | ineq2d 1645 |
. . . . . . . 8
⊢ (t =
z → (z ∩ (t
∖ ∪(x
∖ {t}))) = (z ∩ (z
∖ ∪(x
∖ {z})))) |
| 32 | 24, 31 | iunxsn 2034 |
. . . . . . 7
⊢ ∪t ∈ {z}
(z ∩ (t ∖ ∪(x ∖ {t})))
= (z ∩ (z ∖ ∪(x ∖ {z}))) |
| 33 | 32 | uneq1i 1607 |
. . . . . 6
⊢ (∪t ∈ {z}
(z ∩ (t ∖ ∪(x ∖ {t})))
∪ ∪t ∈
(x ∖ {z})(z ∩
(t ∖ ∪(x ∖ {t})))) = ((z
∩ (z ∖ ∪(x ∖ {z}))) ∪ ∪t ∈ (x
∖ {z})(z ∩ (t
∖ ∪(x
∖ {t})))) |
| 34 | 23, 33 | eqtr 1119 |
. . . . 5
⊢ ∪t ∈ ({z}
∪ (x ∖ {z}))(z ∩
(t ∖ ∪(x ∖ {t}))) = ((z
∩ (z ∖ ∪(x ∖ {z}))) ∪ ∪t ∈ (x
∖ {z})(z ∩ (t
∖ ∪(x
∖ {t})))) |
| 35 | 22, 34 | syl5eq 1136 |
. . . 4
⊢ (z
∈ x → ∪t ∈ ({z} ∪ (x
∖ {z}))(z ∩ (t
∖ ∪(x
∖ {t}))) = ((z ∩ (z
∖ ∪(x
∖ {z}))) ∪ ∅)) |
| 36 | 7, 35 | eqtrd 1128 |
. . 3
⊢ (z
∈ x → ∪t ∈ x (z ∩
(t ∖ ∪(x ∖ {t}))) = ((z
∩ (z ∖ ∪(x ∖ {z}))) ∪ ∅)) |
| 37 | | un0 1721 |
. . . 4
⊢ ((z
∩ (z ∖ ∪(x ∖ {z}))) ∪ ∅) = (z ∩ (z
∖ ∪(x
∖ {z}))) |
| 38 | | difss 1596 |
. . . . 5
⊢ (z
∖ ∪(x
∖ {z})) ⊆ z |
| 39 | | sseqin2 1656 |
. . . . 5
⊢ ((z
∖ ∪(x
∖ {z})) ⊆ z ↔ (z
∩ (z ∖ ∪(x ∖ {z}))) = (z
∖ ∪(x
∖ {z}))) |
| 40 | 38, 39 | mpbi 164 |
. . . 4
⊢ (z
∩ (z ∖ ∪(x ∖ {z}))) = (z
∖ ∪(x
∖ {z})) |
| 41 | 37, 40 | eqtr 1119 |
. . 3
⊢ ((z
∩ (z ∖ ∪(x ∖ {z}))) ∪ ∅) = (z ∖ ∪(x ∖ {z})) |
| 42 | 36, 41 | syl6eq 1140 |
. 2
⊢ (z
∈ x → ∪t ∈ x (z ∩
(t ∖ ∪(x ∖ {t}))) = (z
∖ ∪(x
∖ {z}))) |
| 43 | | kmlem8.1 |
. . . . . 6
⊢ A =
{u∣∃t ∈ x
u = (t
∖ ∪(x
∖ {t}))} |
| 44 | 43 | unieqi 1928 |
. . . . 5
⊢ ∪A = ∪{u∣∃t
∈ x u = (t ∖
∪(x ∖
{t}))} |
| 45 | | visset 1350 |
. . . . . . 7
⊢ t
∈ V |
| 46 | | difexg 1703 |
. . . . . . 7
⊢ (t
∈ V → (t ∖ ∪(x ∖ {t})) ∈ V) |
| 47 | 45, 46 | ax-mp 6 |
. . . . . 6
⊢ (t
∖ ∪(x
∖ {t})) ∈ V |
| 48 | 47 | dfiun2 2014 |
. . . . 5
⊢ ∪t ∈ x
(t ∖ ∪(x ∖ {t})) = ∪{u∣∃t
∈ x u = (t ∖
∪(x ∖
{t}))} |
| 49 | 44, 48 | eqtr4 1122 |
. . . 4
⊢ ∪A = ∪t ∈ x
(t ∖ ∪(x ∖ {t})) |
| 50 | 49 | ineq2i 1642 |
. . 3
⊢ (z
∩ ∪A) =
(z ∩ ∪t ∈ x (t ∖
∪(x ∖
{t}))) |
| 51 | | iunin2 2030 |
. . 3
⊢ ∪t ∈ x
(z ∩ (t ∖ ∪(x ∖ {t})))
= (z ∩ ∪t ∈ x (t ∖
∪(x ∖
{t}))) |
| 52 | 50, 51 | eqtr4 1122 |
. 2
⊢ (z
∩ ∪A) =
∪t ∈
x (z
∩ (t ∖ ∪(x ∖ {t}))) |
| 53 | 42, 52 | syl5eq 1136 |
1
⊢ (z
∈ x → (z ∩ ∪A) = (z ∖
∪(x ∖
{z}))) |