Proof of Theorem domsdomtr
| Step | Hyp | Ref
| Expression |
| 1 | | brdom2 3292 |
. . 3
⊢ (A
≼ B ↔ (A ≺ B ∨
A ≈ B)) |
| 2 | | sdomtr 3373 |
. . . . 5
⊢ ((A
≺ B ∧ B ≺ C)
→ A ≺ C) |
| 3 | 2 | exp 291 |
. . . 4
⊢ (A
≺ B → (B ≺ C
→ A ≺ C)) |
| 4 | | relsdom 3279 |
. . . . . . 7
⊢ Rel ≺ |
| 5 | 4 | brrelexi 2447 |
. . . . . 6
⊢ (B
≺ C → B ∈ V) |
| 6 | | endomtr 3325 |
. . . . . . . . . . 11
⊢ ((A
≈ B ∧ B ≼ C)
→ A ≼ C) |
| 7 | 6 | exp 291 |
. . . . . . . . . 10
⊢ (A
≈ B → (B ≼ C
→ A ≼ C)) |
| 8 | 7 | adantl 305 |
. . . . . . . . 9
⊢ ((B
∈ V ∧ A ≈ B) → (B
≼ C → A ≼ C)) |
| 9 | | ensymg 3316 |
. . . . . . . . . . . 12
⊢ (B
∈ V → (A ≈ B → B
≈ A)) |
| 10 | | entrt 3319 |
. . . . . . . . . . . . 13
⊢ ((B
≈ A ∧ A ≈ C)
→ B ≈ C) |
| 11 | 10 | exp 291 |
. . . . . . . . . . . 12
⊢ (B
≈ A → (A ≈ C
→ B ≈ C)) |
| 12 | 9, 11 | syl6 23 |
. . . . . . . . . . 11
⊢ (B
∈ V → (A ≈ B → (A
≈ C → B ≈ C))) |
| 13 | 12 | imp 277 |
. . . . . . . . . 10
⊢ ((B
∈ V ∧ A ≈ B) → (A
≈ C → B ≈ C)) |
| 14 | 13 | con3d 87 |
. . . . . . . . 9
⊢ ((B
∈ V ∧ A ≈ B) → (¬ B ≈ C
→ ¬ A ≈ C)) |
| 15 | 8, 14 | anim12d 431 |
. . . . . . . 8
⊢ ((B
∈ V ∧ A ≈ B) → ((B
≼ C ∧ ¬ B ≈ C)
→ (A ≼ C ∧ ¬ A
≈ C))) |
| 16 | | brsdom 3286 |
. . . . . . . 8
⊢ (B
≺ C ↔ (B ≼ C
∧ ¬ B ≈ C)) |
| 17 | | brsdom 3286 |
. . . . . . . 8
⊢ (A
≺ C ↔ (A ≼ C
∧ ¬ A ≈ C)) |
| 18 | 15, 16, 17 | 3imtr4g 426 |
. . . . . . 7
⊢ ((B
∈ V ∧ A ≈ B) → (B
≺ C → A ≺ C)) |
| 19 | 18 | exp 291 |
. . . . . 6
⊢ (B
∈ V → (A ≈ B → (B
≺ C → A ≺ C))) |
| 20 | 5, 19 | syl 12 |
. . . . 5
⊢ (B
≺ C → (A ≈ B
→ (B ≺ C → A
≺ C))) |
| 21 | 20 | pm2.43b 61 |
. . . 4
⊢ (A
≈ B → (B ≺ C
→ A ≺ C)) |
| 22 | 3, 21 | jaoi 275 |
. . 3
⊢ ((A
≺ B ∨ A ≈ B)
→ (B ≺ C → A
≺ C)) |
| 23 | 1, 22 | sylbi 174 |
. 2
⊢ (A
≼ B → (B ≺ C
→ A ≺ C)) |
| 24 | 23 | imp 277 |
1
⊢ ((A
≼ B ∧ B ≺ C)
→ A ≺ C) |