| Step | Hyp | Ref
| Expression |
| 1 | | simpr 484 |
. . . . 5
⊢ ((𝐾 ∈ Top ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) → 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) |
| 2 | | cntop2 23219 |
. . . . . . . 8
⊢ (𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵)) → (𝐾 ↾t 𝐵) ∈ Top) |
| 3 | 2 | adantl 481 |
. . . . . . 7
⊢ ((𝐾 ∈ Top ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) → (𝐾 ↾t 𝐵) ∈ Top) |
| 4 | | restrcl 23135 |
. . . . . . 7
⊢ ((𝐾 ↾t 𝐵) ∈ Top → (𝐾 ∈ V ∧ 𝐵 ∈ V)) |
| 5 | | eqid 2737 |
. . . . . . . 8
⊢ ∪ 𝐾 =
∪ 𝐾 |
| 6 | 5 | restin 23144 |
. . . . . . 7
⊢ ((𝐾 ∈ V ∧ 𝐵 ∈ V) → (𝐾 ↾t 𝐵) = (𝐾 ↾t (𝐵 ∩ ∪ 𝐾))) |
| 7 | 3, 4, 6 | 3syl 18 |
. . . . . 6
⊢ ((𝐾 ∈ Top ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) → (𝐾 ↾t 𝐵) = (𝐾 ↾t (𝐵 ∩ ∪ 𝐾))) |
| 8 | 7 | oveq2d 7377 |
. . . . 5
⊢ ((𝐾 ∈ Top ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) → (𝐽 Cn (𝐾 ↾t 𝐵)) = (𝐽 Cn (𝐾 ↾t (𝐵 ∩ ∪ 𝐾)))) |
| 9 | 1, 8 | eleqtrd 2839 |
. . . 4
⊢ ((𝐾 ∈ Top ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) → 𝑓 ∈ (𝐽 Cn (𝐾 ↾t (𝐵 ∩ ∪ 𝐾)))) |
| 10 | | simpl 482 |
. . . . . 6
⊢ ((𝐾 ∈ Top ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) → 𝐾 ∈ Top) |
| 11 | | toptopon2 22896 |
. . . . . 6
⊢ (𝐾 ∈ Top ↔ 𝐾 ∈ (TopOn‘∪ 𝐾)) |
| 12 | 10, 11 | sylib 218 |
. . . . 5
⊢ ((𝐾 ∈ Top ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) → 𝐾 ∈ (TopOn‘∪ 𝐾)) |
| 13 | | cntop1 23218 |
. . . . . . . . 9
⊢ (𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵)) → 𝐽 ∈ Top) |
| 14 | 13 | adantl 481 |
. . . . . . . 8
⊢ ((𝐾 ∈ Top ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) → 𝐽 ∈ Top) |
| 15 | | toptopon2 22896 |
. . . . . . . 8
⊢ (𝐽 ∈ Top ↔ 𝐽 ∈ (TopOn‘∪ 𝐽)) |
| 16 | 14, 15 | sylib 218 |
. . . . . . 7
⊢ ((𝐾 ∈ Top ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) → 𝐽 ∈ (TopOn‘∪ 𝐽)) |
| 17 | | inss2 4179 |
. . . . . . . 8
⊢ (𝐵 ∩ ∪ 𝐾)
⊆ ∪ 𝐾 |
| 18 | | resttopon 23139 |
. . . . . . . 8
⊢ ((𝐾 ∈ (TopOn‘∪ 𝐾)
∧ (𝐵 ∩ ∪ 𝐾)
⊆ ∪ 𝐾) → (𝐾 ↾t (𝐵 ∩ ∪ 𝐾)) ∈ (TopOn‘(𝐵 ∩ ∪ 𝐾))) |
| 19 | 12, 17, 18 | sylancl 587 |
. . . . . . 7
⊢ ((𝐾 ∈ Top ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) → (𝐾 ↾t (𝐵 ∩ ∪ 𝐾)) ∈ (TopOn‘(𝐵 ∩ ∪ 𝐾))) |
| 20 | | cnf2 23227 |
. . . . . . 7
⊢ ((𝐽 ∈ (TopOn‘∪ 𝐽)
∧ (𝐾
↾t (𝐵
∩ ∪ 𝐾)) ∈ (TopOn‘(𝐵 ∩ ∪ 𝐾)) ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t (𝐵 ∩ ∪ 𝐾)))) → 𝑓:∪ 𝐽⟶(𝐵 ∩ ∪ 𝐾)) |
| 21 | 16, 19, 9, 20 | syl3anc 1374 |
. . . . . 6
⊢ ((𝐾 ∈ Top ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) → 𝑓:∪ 𝐽⟶(𝐵 ∩ ∪ 𝐾)) |
| 22 | 21 | frnd 6671 |
. . . . 5
⊢ ((𝐾 ∈ Top ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) → ran 𝑓 ⊆ (𝐵 ∩ ∪ 𝐾)) |
| 23 | 17 | a1i 11 |
. . . . 5
⊢ ((𝐾 ∈ Top ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) → (𝐵 ∩ ∪ 𝐾) ⊆ ∪ 𝐾) |
| 24 | | cnrest2 23264 |
. . . . 5
⊢ ((𝐾 ∈ (TopOn‘∪ 𝐾)
∧ ran 𝑓 ⊆ (𝐵 ∩ ∪ 𝐾)
∧ (𝐵 ∩ ∪ 𝐾)
⊆ ∪ 𝐾) → (𝑓 ∈ (𝐽 Cn 𝐾) ↔ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t (𝐵 ∩ ∪ 𝐾))))) |
| 25 | 12, 22, 23, 24 | syl3anc 1374 |
. . . 4
⊢ ((𝐾 ∈ Top ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) → (𝑓 ∈ (𝐽 Cn 𝐾) ↔ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t (𝐵 ∩ ∪ 𝐾))))) |
| 26 | 9, 25 | mpbird 257 |
. . 3
⊢ ((𝐾 ∈ Top ∧ 𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵))) → 𝑓 ∈ (𝐽 Cn 𝐾)) |
| 27 | 26 | ex 412 |
. 2
⊢ (𝐾 ∈ Top → (𝑓 ∈ (𝐽 Cn (𝐾 ↾t 𝐵)) → 𝑓 ∈ (𝐽 Cn 𝐾))) |
| 28 | 27 | ssrdv 3928 |
1
⊢ (𝐾 ∈ Top → (𝐽 Cn (𝐾 ↾t 𝐵)) ⊆ (𝐽 Cn 𝐾)) |