Proof of Theorem dmdbr2
| Step | Hyp | Ref
| Expression |
| 1 | | dmdbr 5731 |
. 2
⊢ ((A
∈ Cℋ ∧ B
∈ Cℋ ) → ((⊥ ‘A) Mℋ (⊥
‘B) ↔ ∀x ∈ Cℋ (B ⊆ x
→ ((x ∩ A) ∨ℋ B) = (x ∩
(A ∨ℋ B))))) |
| 2 | | inss1 1657 |
. . . . . . . . 9
⊢ (x
∩ A) ⊆ x |
| 3 | | chlubt 5426 |
. . . . . . . . . 10
⊢ (((x
∩ A) ∈ Cℋ
∧ B ∈ Cℋ
∧ x ∈ Cℋ )
→ (((x ∩ A) ⊆ x
∧ B ⊆ x) ↔ ((x
∩ A) ∨ℋ B) ⊆ x)) |
| 4 | 3 | biimpd 135 |
. . . . . . . . 9
⊢ (((x
∩ A) ∈ Cℋ
∧ B ∈ Cℋ
∧ x ∈ Cℋ )
→ (((x ∩ A) ⊆ x
∧ B ⊆ x) → ((x
∩ A) ∨ℋ B) ⊆ x)) |
| 5 | 2, 4 | mpani 521 |
. . . . . . . 8
⊢ (((x
∩ A) ∈ Cℋ
∧ B ∈ Cℋ
∧ x ∈ Cℋ )
→ (B ⊆ x → ((x
∩ A) ∨ℋ B) ⊆ x)) |
| 6 | | chinclt 5416 |
. . . . . . . . . 10
⊢ ((x
∈ Cℋ ∧ A
∈ Cℋ ) → (x ∩ A)
∈ Cℋ ) |
| 7 | 6 | ancoms 334 |
. . . . . . . . 9
⊢ ((A
∈ Cℋ ∧ x
∈ Cℋ ) → (x ∩ A)
∈ Cℋ ) |
| 8 | 7 | adantlr 310 |
. . . . . . . 8
⊢ (((A
∈ Cℋ ∧ B
∈ Cℋ ) ∧ x
∈ Cℋ ) → (x ∩ A)
∈ Cℋ ) |
| 9 | | pm3.27 260 |
. . . . . . . . 9
⊢ ((A
∈ Cℋ ∧ B
∈ Cℋ ) → B ∈ Cℋ ) |
| 10 | 9 | adantr 306 |
. . . . . . . 8
⊢ (((A
∈ Cℋ ∧ B
∈ Cℋ ) ∧ x
∈ Cℋ ) → B ∈ Cℋ ) |
| 11 | | pm3.27 260 |
. . . . . . . 8
⊢ (((A
∈ Cℋ ∧ B
∈ Cℋ ) ∧ x
∈ Cℋ ) → x ∈ Cℋ ) |
| 12 | 5, 8, 10, 11 | syl3anc 629 |
. . . . . . 7
⊢ (((A
∈ Cℋ ∧ B
∈ Cℋ ) ∧ x
∈ Cℋ ) → (B ⊆ x
→ ((x ∩ A) ∨ℋ B) ⊆ x)) |
| 13 | | inss2 1658 |
. . . . . . . . . 10
⊢ (x
∩ A) ⊆ A |
| 14 | | chlej1t 5427 |
. . . . . . . . . 10
⊢ (((x
∩ A) ∈ Cℋ
∧ A ∈ Cℋ
∧ B ∈ Cℋ )
→ ((x ∩ A) ⊆ A
→ ((x ∩ A) ∨ℋ B) ⊆ (A
∨ℋ B))) |
| 15 | 13, 14 | mpi 44 |
. . . . . . . . 9
⊢ (((x
∩ A) ∈ Cℋ
∧ A ∈ Cℋ
∧ B ∈ Cℋ )
→ ((x ∩ A) ∨ℋ B) ⊆ (A
∨ℋ B)) |
| 16 | | pm3.26 256 |
. . . . . . . . . 10
⊢ ((A
∈ Cℋ ∧ B
∈ Cℋ ) → A ∈ Cℋ ) |
| 17 | 16 | adantr 306 |
. . . . . . . . 9
⊢ (((A
∈ Cℋ ∧ B
∈ Cℋ ) ∧ x
∈ Cℋ ) → A ∈ Cℋ ) |
| 18 | 15, 8, 17, 10 | syl3anc 629 |
. . . . . . . 8
⊢ (((A
∈ Cℋ ∧ B
∈ Cℋ ) ∧ x
∈ Cℋ ) → ((x ∩ A)
∨ℋ B) ⊆ (A ∨ℋ B)) |
| 19 | 18 | a1d 14 |
. . . . . . 7
⊢ (((A
∈ Cℋ ∧ B
∈ Cℋ ) ∧ x
∈ Cℋ ) → (B ⊆ x
→ ((x ∩ A) ∨ℋ B) ⊆ (A
∨ℋ B))) |
| 20 | 12, 19 | jcad 455 |
. . . . . 6
⊢ (((A
∈ Cℋ ∧ B
∈ Cℋ ) ∧ x
∈ Cℋ ) → (B ⊆ x
→ (((x ∩ A) ∨ℋ B) ⊆ x
∧ ((x ∩ A) ∨ℋ B) ⊆ (A
∨ℋ B)))) |
| 21 | | ssin 1659 |
. . . . . 6
⊢ ((((x
∩ A) ∨ℋ B) ⊆ x
∧ ((x ∩ A) ∨ℋ B) ⊆ (A
∨ℋ B)) ↔
((x ∩ A) ∨ℋ B) ⊆ (x
∩ (A ∨ℋ B))) |
| 22 | 20, 21 | syl6ib 185 |
. . . . 5
⊢ (((A
∈ Cℋ ∧ B
∈ Cℋ ) ∧ x
∈ Cℋ ) → (B ⊆ x
→ ((x ∩ A) ∨ℋ B) ⊆ (x
∩ (A ∨ℋ B)))) |
| 23 | | eqss 1516 |
. . . . . 6
⊢ (((x
∩ A) ∨ℋ B) = (x ∩
(A ∨ℋ B)) ↔ (((x
∩ A) ∨ℋ B) ⊆ (x
∩ (A ∨ℋ B)) ∧ (x
∩ (A ∨ℋ B)) ⊆ ((x
∩ A) ∨ℋ B))) |
| 24 | 23 | baib 506 |
. . . . 5
⊢ (((x
∩ A) ∨ℋ B) ⊆ (x
∩ (A ∨ℋ B)) → (((x
∩ A) ∨ℋ B) = (x ∩
(A ∨ℋ B)) ↔ (x
∩ (A ∨ℋ B)) ⊆ ((x
∩ A) ∨ℋ B))) |
| 25 | 22, 24 | syl6 23 |
. . . 4
⊢ (((A
∈ Cℋ ∧ B
∈ Cℋ ) ∧ x
∈ Cℋ ) → (B ⊆ x
→ (((x ∩ A) ∨ℋ B) = (x ∩
(A ∨ℋ B)) ↔ (x
∩ (A ∨ℋ B)) ⊆ ((x
∩ A) ∨ℋ B)))) |
| 26 | 25 | pm5.74d 444 |
. . 3
⊢ (((A
∈ Cℋ ∧ B
∈ Cℋ ) ∧ x
∈ Cℋ ) → ((B ⊆ x
→ ((x ∩ A) ∨ℋ B) = (x ∩
(A ∨ℋ B))) ↔ (B
⊆ x → (x ∩ (A
∨ℋ B)) ⊆
((x ∩ A) ∨ℋ B)))) |
| 27 | 26 | biraldva 1215 |
. 2
⊢ ((A
∈ Cℋ ∧ B
∈ Cℋ ) → (∀x ∈ Cℋ (B ⊆ x
→ ((x ∩ A) ∨ℋ B) = (x ∩
(A ∨ℋ B))) ↔ ∀x ∈ Cℋ (B ⊆ x
→ (x ∩ (A ∨ℋ B)) ⊆ ((x
∩ A) ∨ℋ B)))) |
| 28 | 1, 27 | bitrd 406 |
1
⊢ ((A
∈ Cℋ ∧ B
∈ Cℋ ) → ((⊥ ‘A) Mℋ (⊥
‘B) ↔ ∀x ∈ Cℋ (B ⊆ x
→ (x ∩ (A ∨ℋ B)) ⊆ ((x
∩ A) ∨ℋ B)))) |