Theorem ordtr3OLD 5770

Description: Obsolete proof of ordtr3 5769 as of 24-Sep-2021. (Contributed by Mario Carneiro, 30-Dec-2014.) (New usage is discouraged.) (Proof modification is discouraged.)

Assertion

Ref	Expression
ordtr3OLD	⊢ ((Ord 𝐵 ∧ Ord 𝐶) → (𝐴 ∈ 𝐵 → (𝐴 ∈ 𝐶 ∨ 𝐶 ∈ 𝐵)))

Proof of Theorem ordtr3OLD

Step	Hyp	Ref	Expression
1		simpr 477	. . . . 5 ⊢ ((Ord 𝐵 ∧ Ord 𝐶) → Ord 𝐶)
2		ordelord 5745	. . . . . 6 ⊢ ((Ord 𝐵 ∧ 𝐴 ∈ 𝐵) → Ord 𝐴)
3	2	adantlr 751	. . . . 5 ⊢ (((Ord 𝐵 ∧ Ord 𝐶) ∧ 𝐴 ∈ 𝐵) → Ord 𝐴)
4		ordtri1 5756	. . . . 5 ⊢ ((Ord 𝐶 ∧ Ord 𝐴) → (𝐶 ⊆ 𝐴 ↔ ¬ 𝐴 ∈ 𝐶))
5	1, 3, 4	syl2an2r 876	. . . 4 ⊢ (((Ord 𝐵 ∧ Ord 𝐶) ∧ 𝐴 ∈ 𝐵) → (𝐶 ⊆ 𝐴 ↔ ¬ 𝐴 ∈ 𝐶))
6		ordtr2 5768	. . . . . . 7 ⊢ ((Ord 𝐶 ∧ Ord 𝐵) → ((𝐶 ⊆ 𝐴 ∧ 𝐴 ∈ 𝐵) → 𝐶 ∈ 𝐵))
7	6	ancoms 469	. . . . . 6 ⊢ ((Ord 𝐵 ∧ Ord 𝐶) → ((𝐶 ⊆ 𝐴 ∧ 𝐴 ∈ 𝐵) → 𝐶 ∈ 𝐵))
8	7	expcomd 454	. . . . 5 ⊢ ((Ord 𝐵 ∧ Ord 𝐶) → (𝐴 ∈ 𝐵 → (𝐶 ⊆ 𝐴 → 𝐶 ∈ 𝐵)))
9	8	imp 445	. . . 4 ⊢ (((Ord 𝐵 ∧ Ord 𝐶) ∧ 𝐴 ∈ 𝐵) → (𝐶 ⊆ 𝐴 → 𝐶 ∈ 𝐵))
10	5, 9	sylbird 250	. . 3 ⊢ (((Ord 𝐵 ∧ Ord 𝐶) ∧ 𝐴 ∈ 𝐵) → (¬ 𝐴 ∈ 𝐶 → 𝐶 ∈ 𝐵))
11	10	orrd 393	. 2 ⊢ (((Ord 𝐵 ∧ Ord 𝐶) ∧ 𝐴 ∈ 𝐵) → (𝐴 ∈ 𝐶 ∨ 𝐶 ∈ 𝐵))
12	11	ex 450	1 ⊢ ((Ord 𝐵 ∧ Ord 𝐶) → (𝐴 ∈ 𝐵 → (𝐴 ∈ 𝐶 ∨ 𝐶 ∈ 𝐵)))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 196   ∨ wo 383   ∧ wa 384   ∈ wcel 1990   ⊆ wss 3574  Ord word 5722

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pr 4906

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-tr 4753  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-ord 5726

This theorem is referenced by: (None)