Proof of Theorem ensdomtr
| Step | Hyp | Ref
| Expression |
| 1 | | endomtr 3325 |
. . . . . . . 8
⊢ ((A
≈ B ∧ B ≼ C)
→ A ≼ C) |
| 2 | 1 | exp 291 |
. . . . . . 7
⊢ (A
≈ B → (B ≼ C
→ A ≼ C)) |
| 3 | 2 | adantl 305 |
. . . . . 6
⊢ ((B
∈ V ∧ A ≈ B) → (B
≼ C → A ≼ C)) |
| 4 | | ensymg 3316 |
. . . . . . . . 9
⊢ (B
∈ V → (A ≈ B → B
≈ A)) |
| 5 | 4 | imp 277 |
. . . . . . . 8
⊢ ((B
∈ V ∧ A ≈ B) → B
≈ A) |
| 6 | | entrt 3319 |
. . . . . . . . 9
⊢ ((B
≈ A ∧ A ≈ C)
→ B ≈ C) |
| 7 | 6 | exp 291 |
. . . . . . . 8
⊢ (B
≈ A → (A ≈ C
→ B ≈ C)) |
| 8 | 5, 7 | syl 12 |
. . . . . . 7
⊢ ((B
∈ V ∧ A ≈ B) → (A
≈ C → B ≈ C)) |
| 9 | 8 | con3d 87 |
. . . . . 6
⊢ ((B
∈ V ∧ A ≈ B) → (¬ B ≈ C
→ ¬ A ≈ C)) |
| 10 | 3, 9 | anim12d 431 |
. . . . 5
⊢ ((B
∈ V ∧ A ≈ B) → ((B
≼ C ∧ ¬ B ≈ C)
→ (A ≼ C ∧ ¬ A
≈ C))) |
| 11 | | brsdom 3286 |
. . . . 5
⊢ (B
≺ C ↔ (B ≼ C
∧ ¬ B ≈ C)) |
| 12 | | brsdom 3286 |
. . . . 5
⊢ (A
≺ C ↔ (A ≼ C
∧ ¬ A ≈ C)) |
| 13 | 10, 11, 12 | 3imtr4g 426 |
. . . 4
⊢ ((B
∈ V ∧ A ≈ B) → (B
≺ C → A ≺ C)) |
| 14 | 13 | exp 291 |
. . 3
⊢ (B
∈ V → (A ≈ B → (B
≺ C → A ≺ C))) |
| 15 | 14 | imp3a 279 |
. 2
⊢ (B
∈ V → ((A ≈ B ∧ B
≺ C) → A ≺ C)) |
| 16 | | relsdom 3279 |
. . . . . 6
⊢ Rel ≺ |
| 17 | 16 | brrelexi 2447 |
. . . . 5
⊢ (B
≺ C → B ∈ V) |
| 18 | 17 | con3i 90 |
. . . 4
⊢ (¬ B ∈ V → ¬ B ≺ C) |
| 19 | 18 | pm2.21d 74 |
. . 3
⊢ (¬ B ∈ V → (B ≺ C
→ A ≺ C)) |
| 20 | 19 | adantld 307 |
. 2
⊢ (¬ B ∈ V → ((A ≈ B
∧ B ≺ C) → A
≺ C)) |
| 21 | 15, 20 | pm2.61i 110 |
1
⊢ ((A
≈ B ∧ B ≺ C)
→ A ≺ C) |