Proof of Theorem sdomdomtr
| Step | Hyp | Ref
| Expression |
| 1 | | sdomnen 3291 |
. . . 4
⊢ (A
≺ B → ¬ A ≈ B) |
| 2 | 1 | ad2antrl 322 |
. . 3
⊢ ((C
∈ D ∧ (A ≺ B
∧ B ≼ C)) → ¬ A ≈ B) |
| 3 | | domtr 3320 |
. . . . . . . 8
⊢ ((A
≼ B ∧ B ≼ C)
→ A ≼ C) |
| 4 | | sdomdom 3290 |
. . . . . . . 8
⊢ (A
≺ B → A ≼ B) |
| 5 | 3, 4 | sylan 343 |
. . . . . . 7
⊢ ((A
≺ B ∧ B ≼ C)
→ A ≼ C) |
| 6 | | brdom2 3292 |
. . . . . . . 8
⊢ (A
≼ C ↔ (A ≺ C ∨
A ≈ C)) |
| 7 | | df-or 197 |
. . . . . . . 8
⊢ ((A
≺ C ∨ A ≈ C)
↔ (¬ A ≺ C → A
≈ C)) |
| 8 | 6, 7 | bitr 151 |
. . . . . . 7
⊢ (A
≼ C ↔ (¬ A ≺ C
→ A ≈ C)) |
| 9 | 5, 8 | sylib 173 |
. . . . . 6
⊢ ((A
≺ B ∧ B ≼ C)
→ (¬ A ≺ C → A
≈ C)) |
| 10 | 9 | adantl 305 |
. . . . 5
⊢ ((C
∈ D ∧ (A ≺ B
∧ B ≼ C)) → (¬ A ≺ C
→ A ≈ C)) |
| 11 | | ensymg 3316 |
. . . . . . . . . . 11
⊢ (C
∈ D → (A ≈ C
→ C ≈ A)) |
| 12 | | endom 3289 |
. . . . . . . . . . 11
⊢ (C
≈ A → C ≼ A) |
| 13 | 11, 12 | syl6 23 |
. . . . . . . . . 10
⊢ (C
∈ D → (A ≈ C
→ C ≼ A)) |
| 14 | 9, 13 | sylan9r 360 |
. . . . . . . . 9
⊢ ((C
∈ D ∧ (A ≺ B
∧ B ≼ C)) → (¬ A ≺ C
→ C ≼ A)) |
| 15 | 4 | ad2antrl 322 |
. . . . . . . . . 10
⊢ ((C
∈ D ∧ (A ≺ B
∧ B ≼ C)) → A
≼ B) |
| 16 | 15 | a1d 14 |
. . . . . . . . 9
⊢ ((C
∈ D ∧ (A ≺ B
∧ B ≼ C)) → (¬ A ≺ C
→ A ≼ B)) |
| 17 | 14, 16 | jcad 455 |
. . . . . . . 8
⊢ ((C
∈ D ∧ (A ≺ B
∧ B ≼ C)) → (¬ A ≺ C
→ (C ≼ A ∧ A
≼ B))) |
| 18 | | domtr 3320 |
. . . . . . . 8
⊢ ((C
≼ A ∧ A ≼ B)
→ C ≼ B) |
| 19 | 17, 18 | syl6 23 |
. . . . . . 7
⊢ ((C
∈ D ∧ (A ≺ B
∧ B ≼ C)) → (¬ A ≺ C
→ C ≼ B)) |
| 20 | | pm3.27 260 |
. . . . . . . . 9
⊢ ((A
≺ B ∧ B ≼ C)
→ B ≼ C) |
| 21 | 20 | adantl 305 |
. . . . . . . 8
⊢ ((C
∈ D ∧ (A ≺ B
∧ B ≼ C)) → B
≼ C) |
| 22 | 21 | a1d 14 |
. . . . . . 7
⊢ ((C
∈ D ∧ (A ≺ B
∧ B ≼ C)) → (¬ A ≺ C
→ B ≼ C)) |
| 23 | 19, 22 | jcad 455 |
. . . . . 6
⊢ ((C
∈ D ∧ (A ≺ B
∧ B ≼ C)) → (¬ A ≺ C
→ (C ≼ B ∧ B
≼ C))) |
| 24 | | sbth 3359 |
. . . . . 6
⊢ ((C
≼ B ∧ B ≼ C)
→ C ≈ B) |
| 25 | 23, 24 | syl6 23 |
. . . . 5
⊢ ((C
∈ D ∧ (A ≺ B
∧ B ≼ C)) → (¬ A ≺ C
→ C ≈ B)) |
| 26 | 10, 25 | jcad 455 |
. . . 4
⊢ ((C
∈ D ∧ (A ≺ B
∧ B ≼ C)) → (¬ A ≺ C
→ (A ≈ C ∧ C
≈ B))) |
| 27 | | entrt 3319 |
. . . 4
⊢ ((A
≈ C ∧ C ≈ B)
→ A ≈ B) |
| 28 | 26, 27 | syl6 23 |
. . 3
⊢ ((C
∈ D ∧ (A ≺ B
∧ B ≼ C)) → (¬ A ≺ C
→ A ≈ B)) |
| 29 | 2, 28 | mt3d 101 |
. 2
⊢ ((C
∈ D ∧ (A ≺ B
∧ B ≼ C)) → A
≺ C) |
| 30 | 29 | exp 291 |
1
⊢ (C
∈ D → ((A ≺ B
∧ B ≼ C) → A
≺ C)) |