Proof of Theorem chcmh
| Step | Hyp | Ref
| Expression |
| 1 | | cmh.1 |
. . 3
⊢ C =
{h∣(h ∈ Sℋ ∧
∀f ∈ Cauchy (f:ℕ–→h → ∃x ∈ h
f ⇝v x))} |
| 2 | 1 | chsscm 5147 |
. 2
⊢ Cℋ ⊆
C |
| 3 | | df-ral 1205 |
. . . . . 6
⊢ (∀f ∈ Cauchy (f:ℕ–→h → ∃x ∈ h
f ⇝v x) ↔ ∀f(f ∈
Cauchy → (f:ℕ–→h → ∃x ∈ h
f ⇝v x))) |
| 4 | | ax-17 925 |
. . . . . . . . 9
⊢ (f
∈ Cauchy → ∀x f ∈ Cauchy) |
| 5 | | ax-17 925 |
. . . . . . . . . 10
⊢ (f:ℕ–→h → ∀x f:ℕ–→h) |
| 6 | | hbre1 1239 |
. . . . . . . . . 10
⊢ (∃x ∈ h
f ⇝v x → ∀x∃x ∈
h f
⇝v x) |
| 7 | 5, 6 | hbim 702 |
. . . . . . . . 9
⊢ ((f:ℕ–→h → ∃x ∈ h
f ⇝v x) → ∀x(f:ℕ–→h → ∃x ∈ h
f ⇝v x)) |
| 8 | 4, 7 | hbim 702 |
. . . . . . . 8
⊢ ((f
∈ Cauchy → (f:ℕ–→h → ∃x ∈ h
f ⇝v x)) → ∀x(f ∈
Cauchy → (f:ℕ–→h → ∃x ∈ h
f ⇝v x))) |
| 9 | | visset 1350 |
. . . . . . . . . . . . 13
⊢ x
∈ V |
| 10 | | visset 1350 |
. . . . . . . . . . . . 13
⊢ f
∈ V |
| 11 | 9, 10 | hlimcau 5142 |
. . . . . . . . . . . 12
⊢ (f
⇝v x →
f ∈ Cauchy) |
| 12 | 11 | syl4 19 |
. . . . . . . . . . 11
⊢ ((f
∈ Cauchy → ∃x ∈
h f
⇝v x) →
(f ⇝v x → ∃x ∈ h
f ⇝v x)) |
| 13 | | 19.8a 712 |
. . . . . . . . . . . . . 14
⊢ (f
⇝v x →
∃x f ⇝v x) |
| 14 | 10 | hlimeu 5146 |
. . . . . . . . . . . . . 14
⊢ (∃x f
⇝v x ↔
∃!x f ⇝v x) |
| 15 | 13, 14 | sylib 173 |
. . . . . . . . . . . . 13
⊢ (f
⇝v x →
∃!x f ⇝v x) |
| 16 | | eupick 1055 |
. . . . . . . . . . . . . . 15
⊢ ((∃!x f
⇝v x ∧
∃x(f ⇝v x ∧ x ∈
h)) → (f ⇝v x → x
∈ h)) |
| 17 | 16 | exp 291 |
. . . . . . . . . . . . . 14
⊢ (∃!x f
⇝v x →
(∃x(f ⇝v x ∧ x ∈
h) → (f ⇝v x → x
∈ h))) |
| 18 | | df-rex 1206 |
. . . . . . . . . . . . . . 15
⊢ (∃x ∈ h
f ⇝v x ↔ ∃x(x ∈
h ∧ f ⇝v x)) |
| 19 | | exancom 736 |
. . . . . . . . . . . . . . 15
⊢ (∃x(x ∈
h ∧ f ⇝v x) ↔ ∃x(f
⇝v x ∧ x ∈ h)) |
| 20 | 18, 19 | bitr 151 |
. . . . . . . . . . . . . 14
⊢ (∃x ∈ h
f ⇝v x ↔ ∃x(f
⇝v x ∧ x ∈ h)) |
| 21 | 17, 20 | syl5ib 181 |
. . . . . . . . . . . . 13
⊢ (∃!x f
⇝v x →
(∃x ∈ h f
⇝v x →
(f ⇝v x → x
∈ h))) |
| 22 | 15, 21 | syl 12 |
. . . . . . . . . . . 12
⊢ (f
⇝v x →
(∃x ∈ h f
⇝v x →
(f ⇝v x → x
∈ h))) |
| 23 | 22 | pm2.43a 60 |
. . . . . . . . . . 11
⊢ (f
⇝v x →
(∃x ∈ h f
⇝v x →
x ∈ h)) |
| 24 | 12, 23 | sylcom 51 |
. . . . . . . . . 10
⊢ ((f
∈ Cauchy → ∃x ∈
h f
⇝v x) →
(f ⇝v x → x
∈ h)) |
| 25 | 24 | syl3 18 |
. . . . . . . . 9
⊢ ((f:ℕ–→h → (f
∈ Cauchy → ∃x ∈
h f
⇝v x)) &rarrĘ
(f:ℕ–→h → (f
⇝v x →
x ∈ h))) |
| 26 | | bi2.04 141 |
. . . . . . . . 9
⊢ ((f
∈ Cauchy → (f:ℕ–→h → ∃x ∈ h
f ⇝v x)) ↔ (f:ℕ–→h → (f
∈ Cauchy → ∃x ∈
h f
⇝v x))) |
| 27 | | impexp 276 |
. . . . . . . . 9
⊢ (((f:ℕ–→h ∧ f
⇝v x) →
x ∈ h) ↔ (f:ℕ–→h → (f
⇝v x →
x ∈ h))) |
| 28 | 25, 26, 27 | 3imtr4 192 |
. . . . . . . 8
⊢ ((f
∈ Cauchy → (f:ℕ–→h → ∃x ∈ h
f ⇝v x)) → ((f:ℕ–→h ∧ f
⇝v x) →
x ∈ h)) |
| 29 | 8, 28 | 19.21ai 740 |
. . . . . . 7
⊢ ((f
∈ Cauchy → (f:ℕ–→h → ∃x ∈ h
f ⇝v x)) → ∀x((f:ℕ–→h ∧ f
⇝v x) →
x ∈ h)) |
| 30 | 29 | 19.20i 691 |
. . . . . 6
⊢ (∀f(f ∈
Cauchy → (f:ℕ–→h → ∃x ∈ h
f ⇝v x)) → ∀f∀x((f:ℕ–→h ∧ f
⇝v x) →
x ∈ h)) |
| 31 | 3, 30 | sylbi 174 |
. . . . 5
⊢ (∀f ∈ Cauchy (f:ℕ–→h → ∃x ∈ h
f ⇝v x) → ∀f∀x((f:ℕ–→h ∧ f
⇝v x) →
x ∈ h)) |
| 32 | 31 | anim2i 270 |
. . . 4
⊢ ((h
∈ Sℋ ∧ ∀f ∈ Cauchy (f:ℕ–→h → ∃x ∈ h
f ⇝v x)) → (h
∈ Sℋ ∧ ∀f∀x((f:ℕ–→h ∧ f
⇝v x) →
x ∈ h))) |
| 33 | 1 | cleqabi 1176 |
. . . 4
⊢ (h
∈ C ↔ (h ∈ Sℋ ∧
∀f ∈ Cauchy (f:ℕ–→h → ∃x ∈ h
f ⇝v x))) |
| 34 | | closedsub 5128 |
. . . 4
⊢ (h
∈ Cℋ ↔ (h
∈ Sℋ ∧ ∀f∀x((f:ℕ–→h ∧ f
⇝v x) →
x ∈ h))) |
| 35 | 32, 33, 34 | 3imtr4 192 |
. . 3
⊢ (h
∈ C → h ∈ Cℋ ) |
| 36 | 35 | ssriv 1508 |
. 2
⊢ C
⊆ Cℋ |
| 37 | 2, 36 | eqssi 1517 |
1
⊢ Cℋ = C |