Proof of Theorem mdsymlem1
| Step | Hyp | Ref
| Expression |
| 1 | | mdsymlem1.1 |
. . . . . . . 8
⊢ A
∈ Cℋ |
| 2 | | chub2t 5425 |
. . . . . . . 8
⊢ ((p
∈ Cℋ ∧ A
∈ Cℋ ) → p ⊆ (A
∨ℋ p)) |
| 3 | 1, 2 | mpan2 519 |
. . . . . . 7
⊢ (p
∈ Cℋ → p
⊆ (A ∨ℋ p)) |
| 4 | | mdsymlem1.3 |
. . . . . . 7
⊢ C =
(A ∨ℋ p) |
| 5 | 3, 4 | syl6ssr 1547 |
. . . . . 6
⊢ (p
∈ Cℋ → p
⊆ C) |
| 6 | | mdsymlem1.2 |
. . . . . . . . 9
⊢ B
∈ Cℋ |
| 7 | 1, 6 | chjcom 5389 |
. . . . . . . 8
⊢ (A
∨ℋ B) = (B ∨ℋ A) |
| 8 | 7 | sseq2i 1525 |
. . . . . . 7
⊢ (p
⊆ (A ∨ℋ B) ↔ p
⊆ (B ∨ℋ A)) |
| 9 | 8 | biimp 133 |
. . . . . 6
⊢ (p
⊆ (A ∨ℋ B) → p
⊆ (B ∨ℋ A)) |
| 10 | 5, 9 | anim12i 268 |
. . . . 5
⊢ ((p
∈ Cℋ ∧ p
⊆ (A ∨ℋ B)) → (p
⊆ C ∧ p ⊆ (B
∨ℋ A))) |
| 11 | | ssin 1659 |
. . . . 5
⊢ ((p
⊆ C ∧ p ⊆ (B
∨ℋ A)) ↔ p ⊆ (C
∩ (B ∨ℋ A))) |
| 12 | 10, 11 | sylib 173 |
. . . 4
⊢ ((p
∈ Cℋ ∧ p
⊆ (A ∨ℋ B)) → p
⊆ (C ∩ (B ∨ℋ A))) |
| 13 | 12 | adantrl 311 |
. . 3
⊢ ((p
∈ Cℋ ∧ ((⊥ ‘B) Mℋ (⊥
‘A) ∧ p ⊆ (A
∨ℋ B))) → p ⊆ (C
∩ (B ∨ℋ A))) |
| 14 | 13 | adantlr 310 |
. 2
⊢ (((p
∈ Cℋ ∧ (B
∩ C) ⊆ A) ∧ ((⊥ ‘B) Mℋ (⊥
‘A) ∧ p ⊆ (A
∨ℋ B))) → p ⊆ (C
∩ (B ∨ℋ A))) |
| 15 | | chub1t 5424 |
. . . . . . . . 9
⊢ ((A
∈ Cℋ ∧ p
∈ Cℋ ) → A ⊆ (A
∨ℋ p)) |
| 16 | 1, 15 | mpan 518 |
. . . . . . . 8
⊢ (p
∈ Cℋ → A
⊆ (A ∨ℋ p)) |
| 17 | 16, 4 | syl6ssr 1547 |
. . . . . . 7
⊢ (p
∈ Cℋ → A
⊆ C) |
| 18 | 17 | adantr 306 |
. . . . . 6
⊢ ((p
∈ Cℋ ∧ (⊥ ‘B) Mℋ (⊥
‘A)) → A ⊆ C) |
| 19 | 4 | a1i 7 |
. . . . . . . . 9
⊢ (p
∈ Cℋ → C
= (A ∨ℋ p)) |
| 20 | | chjclt 5330 |
. . . . . . . . . 10
⊢ ((A
∈ Cℋ ∧ p
∈ Cℋ ) → (A ∨ℋ p) ∈ Cℋ ) |
| 21 | 1, 20 | mpan 518 |
. . . . . . . . 9
⊢ (p
∈ Cℋ → (A
∨ℋ p) ∈
Cℋ ) |
| 22 | 19, 21 | eqeltrd 1163 |
. . . . . . . 8
⊢ (p
∈ Cℋ → C
∈ Cℋ ) |
| 23 | | dmdi 5732 |
. . . . . . . . . 10
⊢ ((B
∈ Cℋ ∧ A
∈ Cℋ ∧ C
∈ Cℋ ) → ((⊥ ‘B) Mℋ (⊥
‘A) → (A ⊆ C
→ ((C ∩ B) ∨ℋ A) = (C ∩
(B ∨ℋ A))))) |
| 24 | 6, 23 | mp3an1 639 |
. . . . . . . . 9
⊢ ((A
∈ Cℋ ∧ C
∈ Cℋ ) → ((⊥ ‘B) Mℋ (⊥
‘A) → (A ⊆ C
→ ((C ∩ B) ∨ℋ A) = (C ∩
(B ∨ℋ A))))) |
| 25 | 1, 24 | mpan 518 |
. . . . . . . 8
⊢ (C
∈ Cℋ → ((⊥ ‘B) Mℋ (⊥
‘A) → (A ⊆ C
→ ((C ∩ B) ∨ℋ A) = (C ∩
(B ∨ℋ A))))) |
| 26 | 22, 25 | syl 12 |
. . . . . . 7
⊢ (p
∈ Cℋ → ((⊥ ‘B) Mℋ (⊥
‘A) → (A ⊆ C
→ ((C ∩ B) ∨ℋ A) = (C ∩
(B ∨ℋ A))))) |
| 27 | 26 | imp 277 |
. . . . . 6
⊢ ((p
∈ Cℋ ∧ (⊥ ‘B) Mℋ (⊥
‘A)) → (A ⊆ C
→ ((C ∩ B) ∨ℋ A) = (C ∩
(B ∨ℋ A)))) |
| 28 | 18, 27 | mpd 46 |
. . . . 5
⊢ ((p
∈ Cℋ ∧ (⊥ ‘B) Mℋ (⊥
‘A)) → ((C ∩ B)
∨ℋ A) = (C ∩ (B
∨ℋ A))) |
| 29 | 28 | adantlr 310 |
. . . 4
⊢ (((p
∈ Cℋ ∧ (B
∩ C) ⊆ A) ∧ (⊥ ‘B) Mℋ (⊥
‘A)) → ((C ∩ B)
∨ℋ A) = (C ∩ (B
∨ℋ A))) |
| 30 | | chinclt 5416 |
. . . . . . . . 9
⊢ ((B
∈ Cℋ ∧ C
∈ Cℋ ) → (B ∩ C)
∈ Cℋ ) |
| 31 | 6, 30 | mpan 518 |
. . . . . . . 8
⊢ (C
∈ Cℋ → (B
∩ C) ∈ Cℋ
) |
| 32 | | chlejb1t 5429 |
. . . . . . . . 9
⊢ (((B
∩ C) ∈ Cℋ
∧ A ∈ Cℋ )
→ ((B ∩ C) ⊆ A
↔ ((B ∩ C) ∨ℋ A) = A)) |
| 33 | 1, 32 | mpan2 519 |
. . . . . . . 8
⊢ ((B
∩ C) ∈ Cℋ
→ ((B ∩ C) ⊆ A
↔ ((B ∩ C) ∨ℋ A) = A)) |
| 34 | 22, 31, 33 | 3syl 21 |
. . . . . . 7
⊢ (p
∈ Cℋ → ((B ∩ C)
⊆ A ↔ ((B ∩ C)
∨ℋ A) = A)) |
| 35 | 34 | biimpa 324 |
. . . . . 6
⊢ ((p
∈ Cℋ ∧ (B
∩ C) ⊆ A) → ((B
∩ C) ∨ℋ A) = A) |
| 36 | | incom 1636 |
. . . . . . 7
⊢ (C
∩ B) = (B ∩ C) |
| 37 | 36 | opreq1i 3009 |
. . . . . 6
⊢ ((C
∩ B) ∨ℋ A) = ((B ∩
C) ∨ℋ A) |
| 38 | 35, 37 | syl5eq 1136 |
. . . . 5
⊢ ((p
∈ Cℋ ∧ (B
∩ C) ⊆ A) → ((C
∩ B) ∨ℋ A) = A) |
| 39 | 38 | adantr 306 |
. . . 4
⊢ (((p
∈ Cℋ ∧ (B
∩ C) ⊆ A) ∧ (⊥ ‘B) Mℋ (⊥
‘A)) → ((C ∩ B)
∨ℋ A) = A) |
| 40 | 29, 39 | eqtr3d 1130 |
. . 3
⊢ (((p
∈ Cℋ ∧ (B
∩ C) ⊆ A) ∧ (⊥ ‘B) Mℋ (⊥
‘A)) → (C ∩ (B
∨ℋ A)) = A) |
| 41 | 40 | adantrr 312 |
. 2
⊢ (((p
∈ Cℋ ∧ (B
∩ C) ⊆ A) ∧ ((⊥ ‘B) Mℋ (⊥
‘A) ∧ p ⊆ (A
∨ℋ B))) →
(C ∩ (B ∨ℋ A)) = A) |
| 42 | 14, 41 | sseqtrd 1536 |
1
⊢ (((p
∈ Cℋ ∧ (B
∩ C) ⊆ A) ∧ ((⊥ ‘B) Mℋ (⊥
‘A) ∧ p ⊆ (A
∨ℋ B))) → p ⊆ A) |