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Theorem dfpo2 31771
 Description: Quantifier free definition of a partial ordering. (Contributed by Scott Fenton, 22-Feb-2013.)
Assertion
Ref Expression
dfpo2 (𝑅 Po 𝐴 ↔ ((𝑅 ∩ ( I ↾ 𝐴)) = ∅ ∧ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) ⊆ 𝑅))

Proof of Theorem dfpo2
Dummy variables 𝑥 𝑦 𝑧 𝑤 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 po0 5079 . . . 4 𝑅 Po ∅
2 res0 5432 . . . . . . 7 ( I ↾ ∅) = ∅
32ineq2i 3844 . . . . . 6 (𝑅 ∩ ( I ↾ ∅)) = (𝑅 ∩ ∅)
4 in0 4001 . . . . . 6 (𝑅 ∩ ∅) = ∅
53, 4eqtri 2673 . . . . 5 (𝑅 ∩ ( I ↾ ∅)) = ∅
6 xp0 5587 . . . . . . . . . 10 (𝐴 × ∅) = ∅
76ineq2i 3844 . . . . . . . . 9 (𝑅 ∩ (𝐴 × ∅)) = (𝑅 ∩ ∅)
87, 4eqtri 2673 . . . . . . . 8 (𝑅 ∩ (𝐴 × ∅)) = ∅
98coeq2i 5315 . . . . . . 7 ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × ∅))) = ((𝑅 ∩ (𝐴 × 𝐴)) ∘ ∅)
10 co02 5687 . . . . . . 7 ((𝑅 ∩ (𝐴 × 𝐴)) ∘ ∅) = ∅
119, 10eqtri 2673 . . . . . 6 ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × ∅))) = ∅
12 0ss 4005 . . . . . 6 ∅ ⊆ 𝑅
1311, 12eqsstri 3668 . . . . 5 ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × ∅))) ⊆ 𝑅
145, 13pm3.2i 470 . . . 4 ((𝑅 ∩ ( I ↾ ∅)) = ∅ ∧ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × ∅))) ⊆ 𝑅)
151, 142th 254 . . 3 (𝑅 Po ∅ ↔ ((𝑅 ∩ ( I ↾ ∅)) = ∅ ∧ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × ∅))) ⊆ 𝑅))
16 poeq2 5068 . . . 4 (𝐴 = ∅ → (𝑅 Po 𝐴𝑅 Po ∅))
17 reseq2 5423 . . . . . . 7 (𝐴 = ∅ → ( I ↾ 𝐴) = ( I ↾ ∅))
1817ineq2d 3847 . . . . . 6 (𝐴 = ∅ → (𝑅 ∩ ( I ↾ 𝐴)) = (𝑅 ∩ ( I ↾ ∅)))
1918eqeq1d 2653 . . . . 5 (𝐴 = ∅ → ((𝑅 ∩ ( I ↾ 𝐴)) = ∅ ↔ (𝑅 ∩ ( I ↾ ∅)) = ∅))
20 xpeq2 5163 . . . . . . . 8 (𝐴 = ∅ → (𝐴 × 𝐴) = (𝐴 × ∅))
2120ineq2d 3847 . . . . . . 7 (𝐴 = ∅ → (𝑅 ∩ (𝐴 × 𝐴)) = (𝑅 ∩ (𝐴 × ∅)))
2221coeq2d 5317 . . . . . 6 (𝐴 = ∅ → ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) = ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × ∅))))
2322sseq1d 3665 . . . . 5 (𝐴 = ∅ → (((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) ⊆ 𝑅 ↔ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × ∅))) ⊆ 𝑅))
2419, 23anbi12d 747 . . . 4 (𝐴 = ∅ → (((𝑅 ∩ ( I ↾ 𝐴)) = ∅ ∧ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) ⊆ 𝑅) ↔ ((𝑅 ∩ ( I ↾ ∅)) = ∅ ∧ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × ∅))) ⊆ 𝑅)))
2516, 24bibi12d 334 . . 3 (𝐴 = ∅ → ((𝑅 Po 𝐴 ↔ ((𝑅 ∩ ( I ↾ 𝐴)) = ∅ ∧ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) ⊆ 𝑅)) ↔ (𝑅 Po ∅ ↔ ((𝑅 ∩ ( I ↾ ∅)) = ∅ ∧ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × ∅))) ⊆ 𝑅))))
2615, 25mpbiri 248 . 2 (𝐴 = ∅ → (𝑅 Po 𝐴 ↔ ((𝑅 ∩ ( I ↾ 𝐴)) = ∅ ∧ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) ⊆ 𝑅)))
27 r19.28zv 4099 . . . . . . 7 (𝐴 ≠ ∅ → (∀𝑧𝐴𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)) ↔ (¬ 𝑥𝑅𝑥 ∧ ∀𝑧𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))))
2827ralbidv 3015 . . . . . 6 (𝐴 ≠ ∅ → (∀𝑦𝐴𝑧𝐴𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)) ↔ ∀𝑦𝐴𝑥𝑅𝑥 ∧ ∀𝑧𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))))
29 r19.28zv 4099 . . . . . 6 (𝐴 ≠ ∅ → (∀𝑦𝐴𝑥𝑅𝑥 ∧ ∀𝑧𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)) ↔ (¬ 𝑥𝑅𝑥 ∧ ∀𝑦𝐴𝑧𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))))
3028, 29bitrd 268 . . . . 5 (𝐴 ≠ ∅ → (∀𝑦𝐴𝑧𝐴𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)) ↔ (¬ 𝑥𝑅𝑥 ∧ ∀𝑦𝐴𝑧𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))))
3130ralbidv 3015 . . . 4 (𝐴 ≠ ∅ → (∀𝑥𝐴𝑦𝐴𝑧𝐴𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)) ↔ ∀𝑥𝐴𝑥𝑅𝑥 ∧ ∀𝑦𝐴𝑧𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))))
32 r19.26 3093 . . . 4 (∀𝑥𝐴𝑥𝑅𝑥 ∧ ∀𝑦𝐴𝑧𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)) ↔ (∀𝑥𝐴 ¬ 𝑥𝑅𝑥 ∧ ∀𝑥𝐴𝑦𝐴𝑧𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)))
3331, 32syl6bb 276 . . 3 (𝐴 ≠ ∅ → (∀𝑥𝐴𝑦𝐴𝑧𝐴𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)) ↔ (∀𝑥𝐴 ¬ 𝑥𝑅𝑥 ∧ ∀𝑥𝐴𝑦𝐴𝑧𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))))
34 df-po 5064 . . 3 (𝑅 Po 𝐴 ↔ ∀𝑥𝐴𝑦𝐴𝑧𝐴𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)))
35 disj 4050 . . . . 5 ((𝑅 ∩ ( I ↾ 𝐴)) = ∅ ↔ ∀𝑤𝑅 ¬ 𝑤 ∈ ( I ↾ 𝐴))
36 df-ral 2946 . . . . 5 (∀𝑤𝑅 ¬ 𝑤 ∈ ( I ↾ 𝐴) ↔ ∀𝑤(𝑤𝑅 → ¬ 𝑤 ∈ ( I ↾ 𝐴)))
37 opex 4962 . . . . . . . . . 10 𝑥, 𝑥⟩ ∈ V
38 eleq1 2718 . . . . . . . . . . . 12 (𝑤 = ⟨𝑥, 𝑥⟩ → (𝑤𝑅 ↔ ⟨𝑥, 𝑥⟩ ∈ 𝑅))
39 df-br 4686 . . . . . . . . . . . 12 (𝑥𝑅𝑥 ↔ ⟨𝑥, 𝑥⟩ ∈ 𝑅)
4038, 39syl6bbr 278 . . . . . . . . . . 11 (𝑤 = ⟨𝑥, 𝑥⟩ → (𝑤𝑅𝑥𝑅𝑥))
41 eleq1 2718 . . . . . . . . . . . . 13 (𝑤 = ⟨𝑥, 𝑥⟩ → (𝑤 ∈ ( I ↾ 𝐴) ↔ ⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴)))
42 vex 3234 . . . . . . . . . . . . . . . 16 𝑥 ∈ V
43 ididg 5308 . . . . . . . . . . . . . . . 16 (𝑥 ∈ V → 𝑥 I 𝑥)
4442, 43ax-mp 5 . . . . . . . . . . . . . . 15 𝑥 I 𝑥
4542brres 5437 . . . . . . . . . . . . . . 15 (𝑥( I ↾ 𝐴)𝑥 ↔ (𝑥 I 𝑥𝑥𝐴))
4644, 45mpbiran 973 . . . . . . . . . . . . . 14 (𝑥( I ↾ 𝐴)𝑥𝑥𝐴)
47 df-br 4686 . . . . . . . . . . . . . 14 (𝑥( I ↾ 𝐴)𝑥 ↔ ⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴))
4846, 47bitr3i 266 . . . . . . . . . . . . 13 (𝑥𝐴 ↔ ⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴))
4941, 48syl6bbr 278 . . . . . . . . . . . 12 (𝑤 = ⟨𝑥, 𝑥⟩ → (𝑤 ∈ ( I ↾ 𝐴) ↔ 𝑥𝐴))
5049notbid 307 . . . . . . . . . . 11 (𝑤 = ⟨𝑥, 𝑥⟩ → (¬ 𝑤 ∈ ( I ↾ 𝐴) ↔ ¬ 𝑥𝐴))
5140, 50imbi12d 333 . . . . . . . . . 10 (𝑤 = ⟨𝑥, 𝑥⟩ → ((𝑤𝑅 → ¬ 𝑤 ∈ ( I ↾ 𝐴)) ↔ (𝑥𝑅𝑥 → ¬ 𝑥𝐴)))
5237, 51spcv 3330 . . . . . . . . 9 (∀𝑤(𝑤𝑅 → ¬ 𝑤 ∈ ( I ↾ 𝐴)) → (𝑥𝑅𝑥 → ¬ 𝑥𝐴))
5352con2d 129 . . . . . . . 8 (∀𝑤(𝑤𝑅 → ¬ 𝑤 ∈ ( I ↾ 𝐴)) → (𝑥𝐴 → ¬ 𝑥𝑅𝑥))
5453alrimiv 1895 . . . . . . 7 (∀𝑤(𝑤𝑅 → ¬ 𝑤 ∈ ( I ↾ 𝐴)) → ∀𝑥(𝑥𝐴 → ¬ 𝑥𝑅𝑥))
55 relres 5461 . . . . . . . . . . . 12 Rel ( I ↾ 𝐴)
56 elrel 5256 . . . . . . . . . . . 12 ((Rel ( I ↾ 𝐴) ∧ 𝑤 ∈ ( I ↾ 𝐴)) → ∃𝑦𝑧 𝑤 = ⟨𝑦, 𝑧⟩)
5755, 56mpan 706 . . . . . . . . . . 11 (𝑤 ∈ ( I ↾ 𝐴) → ∃𝑦𝑧 𝑤 = ⟨𝑦, 𝑧⟩)
5857ancri 574 . . . . . . . . . 10 (𝑤 ∈ ( I ↾ 𝐴) → (∃𝑦𝑧 𝑤 = ⟨𝑦, 𝑧⟩ ∧ 𝑤 ∈ ( I ↾ 𝐴)))
59 eleq1 2718 . . . . . . . . . . . . . . . 16 (𝑥 = 𝑦 → (𝑥𝐴𝑦𝐴))
60 breq12 4690 . . . . . . . . . . . . . . . . . 18 ((𝑥 = 𝑦𝑥 = 𝑦) → (𝑥𝑅𝑥𝑦𝑅𝑦))
6160anidms 678 . . . . . . . . . . . . . . . . 17 (𝑥 = 𝑦 → (𝑥𝑅𝑥𝑦𝑅𝑦))
6261notbid 307 . . . . . . . . . . . . . . . 16 (𝑥 = 𝑦 → (¬ 𝑥𝑅𝑥 ↔ ¬ 𝑦𝑅𝑦))
6359, 62imbi12d 333 . . . . . . . . . . . . . . 15 (𝑥 = 𝑦 → ((𝑥𝐴 → ¬ 𝑥𝑅𝑥) ↔ (𝑦𝐴 → ¬ 𝑦𝑅𝑦)))
6463spv 2296 . . . . . . . . . . . . . 14 (∀𝑥(𝑥𝐴 → ¬ 𝑥𝑅𝑥) → (𝑦𝐴 → ¬ 𝑦𝑅𝑦))
65 breq2 4689 . . . . . . . . . . . . . . . . . 18 (𝑦 = 𝑧 → (𝑦𝑅𝑦𝑦𝑅𝑧))
6665notbid 307 . . . . . . . . . . . . . . . . 17 (𝑦 = 𝑧 → (¬ 𝑦𝑅𝑦 ↔ ¬ 𝑦𝑅𝑧))
6766imbi2d 329 . . . . . . . . . . . . . . . 16 (𝑦 = 𝑧 → ((𝑦𝐴 → ¬ 𝑦𝑅𝑦) ↔ (𝑦𝐴 → ¬ 𝑦𝑅𝑧)))
6867biimpcd 239 . . . . . . . . . . . . . . 15 ((𝑦𝐴 → ¬ 𝑦𝑅𝑦) → (𝑦 = 𝑧 → (𝑦𝐴 → ¬ 𝑦𝑅𝑧)))
6968impd 446 . . . . . . . . . . . . . 14 ((𝑦𝐴 → ¬ 𝑦𝑅𝑦) → ((𝑦 = 𝑧𝑦𝐴) → ¬ 𝑦𝑅𝑧))
7064, 69syl 17 . . . . . . . . . . . . 13 (∀𝑥(𝑥𝐴 → ¬ 𝑥𝑅𝑥) → ((𝑦 = 𝑧𝑦𝐴) → ¬ 𝑦𝑅𝑧))
71 eleq1 2718 . . . . . . . . . . . . . . 15 (𝑤 = ⟨𝑦, 𝑧⟩ → (𝑤 ∈ ( I ↾ 𝐴) ↔ ⟨𝑦, 𝑧⟩ ∈ ( I ↾ 𝐴)))
72 vex 3234 . . . . . . . . . . . . . . . . 17 𝑧 ∈ V
7372brres 5437 . . . . . . . . . . . . . . . 16 (𝑦( I ↾ 𝐴)𝑧 ↔ (𝑦 I 𝑧𝑦𝐴))
74 df-br 4686 . . . . . . . . . . . . . . . 16 (𝑦( I ↾ 𝐴)𝑧 ↔ ⟨𝑦, 𝑧⟩ ∈ ( I ↾ 𝐴))
7572ideq 5307 . . . . . . . . . . . . . . . . 17 (𝑦 I 𝑧𝑦 = 𝑧)
7675anbi1i 731 . . . . . . . . . . . . . . . 16 ((𝑦 I 𝑧𝑦𝐴) ↔ (𝑦 = 𝑧𝑦𝐴))
7773, 74, 763bitr3ri 291 . . . . . . . . . . . . . . 15 ((𝑦 = 𝑧𝑦𝐴) ↔ ⟨𝑦, 𝑧⟩ ∈ ( I ↾ 𝐴))
7871, 77syl6bbr 278 . . . . . . . . . . . . . 14 (𝑤 = ⟨𝑦, 𝑧⟩ → (𝑤 ∈ ( I ↾ 𝐴) ↔ (𝑦 = 𝑧𝑦𝐴)))
79 eleq1 2718 . . . . . . . . . . . . . . . 16 (𝑤 = ⟨𝑦, 𝑧⟩ → (𝑤𝑅 ↔ ⟨𝑦, 𝑧⟩ ∈ 𝑅))
80 df-br 4686 . . . . . . . . . . . . . . . 16 (𝑦𝑅𝑧 ↔ ⟨𝑦, 𝑧⟩ ∈ 𝑅)
8179, 80syl6bbr 278 . . . . . . . . . . . . . . 15 (𝑤 = ⟨𝑦, 𝑧⟩ → (𝑤𝑅𝑦𝑅𝑧))
8281notbid 307 . . . . . . . . . . . . . 14 (𝑤 = ⟨𝑦, 𝑧⟩ → (¬ 𝑤𝑅 ↔ ¬ 𝑦𝑅𝑧))
8378, 82imbi12d 333 . . . . . . . . . . . . 13 (𝑤 = ⟨𝑦, 𝑧⟩ → ((𝑤 ∈ ( I ↾ 𝐴) → ¬ 𝑤𝑅) ↔ ((𝑦 = 𝑧𝑦𝐴) → ¬ 𝑦𝑅𝑧)))
8470, 83syl5ibrcom 237 . . . . . . . . . . . 12 (∀𝑥(𝑥𝐴 → ¬ 𝑥𝑅𝑥) → (𝑤 = ⟨𝑦, 𝑧⟩ → (𝑤 ∈ ( I ↾ 𝐴) → ¬ 𝑤𝑅)))
8584exlimdvv 1902 . . . . . . . . . . 11 (∀𝑥(𝑥𝐴 → ¬ 𝑥𝑅𝑥) → (∃𝑦𝑧 𝑤 = ⟨𝑦, 𝑧⟩ → (𝑤 ∈ ( I ↾ 𝐴) → ¬ 𝑤𝑅)))
8685impd 446 . . . . . . . . . 10 (∀𝑥(𝑥𝐴 → ¬ 𝑥𝑅𝑥) → ((∃𝑦𝑧 𝑤 = ⟨𝑦, 𝑧⟩ ∧ 𝑤 ∈ ( I ↾ 𝐴)) → ¬ 𝑤𝑅))
8758, 86syl5 34 . . . . . . . . 9 (∀𝑥(𝑥𝐴 → ¬ 𝑥𝑅𝑥) → (𝑤 ∈ ( I ↾ 𝐴) → ¬ 𝑤𝑅))
8887con2d 129 . . . . . . . 8 (∀𝑥(𝑥𝐴 → ¬ 𝑥𝑅𝑥) → (𝑤𝑅 → ¬ 𝑤 ∈ ( I ↾ 𝐴)))
8988alrimiv 1895 . . . . . . 7 (∀𝑥(𝑥𝐴 → ¬ 𝑥𝑅𝑥) → ∀𝑤(𝑤𝑅 → ¬ 𝑤 ∈ ( I ↾ 𝐴)))
9054, 89impbii 199 . . . . . 6 (∀𝑤(𝑤𝑅 → ¬ 𝑤 ∈ ( I ↾ 𝐴)) ↔ ∀𝑥(𝑥𝐴 → ¬ 𝑥𝑅𝑥))
91 df-ral 2946 . . . . . 6 (∀𝑥𝐴 ¬ 𝑥𝑅𝑥 ↔ ∀𝑥(𝑥𝐴 → ¬ 𝑥𝑅𝑥))
9290, 91bitr4i 267 . . . . 5 (∀𝑤(𝑤𝑅 → ¬ 𝑤 ∈ ( I ↾ 𝐴)) ↔ ∀𝑥𝐴 ¬ 𝑥𝑅𝑥)
9335, 36, 923bitri 286 . . . 4 ((𝑅 ∩ ( I ↾ 𝐴)) = ∅ ↔ ∀𝑥𝐴 ¬ 𝑥𝑅𝑥)
94 ralcom 3127 . . . . . . 7 (∀𝑦𝐴𝑧𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧) ↔ ∀𝑧𝐴𝑦𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))
95 r19.23v 3052 . . . . . . . 8 (∀𝑦𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧) ↔ (∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))
9695ralbii 3009 . . . . . . 7 (∀𝑧𝐴𝑦𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧) ↔ ∀𝑧𝐴 (∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))
9794, 96bitri 264 . . . . . 6 (∀𝑦𝐴𝑧𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧) ↔ ∀𝑧𝐴 (∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))
9897ralbii 3009 . . . . 5 (∀𝑥𝐴𝑦𝐴𝑧𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧) ↔ ∀𝑥𝐴𝑧𝐴 (∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))
99 brin 4737 . . . . . . . . . . . 12 (𝑥(𝑅 ∩ (𝐴 × 𝐴))𝑦 ↔ (𝑥𝑅𝑦𝑥(𝐴 × 𝐴)𝑦))
100 brin 4737 . . . . . . . . . . . 12 (𝑦(𝑅 ∩ (𝐴 × 𝐴))𝑧 ↔ (𝑦𝑅𝑧𝑦(𝐴 × 𝐴)𝑧))
10199, 100anbi12i 733 . . . . . . . . . . 11 ((𝑥(𝑅 ∩ (𝐴 × 𝐴))𝑦𝑦(𝑅 ∩ (𝐴 × 𝐴))𝑧) ↔ ((𝑥𝑅𝑦𝑥(𝐴 × 𝐴)𝑦) ∧ (𝑦𝑅𝑧𝑦(𝐴 × 𝐴)𝑧)))
102 an4 882 . . . . . . . . . . . 12 (((𝑥𝑅𝑦𝑥(𝐴 × 𝐴)𝑦) ∧ (𝑦𝑅𝑧𝑦(𝐴 × 𝐴)𝑧)) ↔ ((𝑥𝑅𝑦𝑦𝑅𝑧) ∧ (𝑥(𝐴 × 𝐴)𝑦𝑦(𝐴 × 𝐴)𝑧)))
103 ancom 465 . . . . . . . . . . . 12 (((𝑥𝑅𝑦𝑦𝑅𝑧) ∧ (𝑥(𝐴 × 𝐴)𝑦𝑦(𝐴 × 𝐴)𝑧)) ↔ ((𝑥(𝐴 × 𝐴)𝑦𝑦(𝐴 × 𝐴)𝑧) ∧ (𝑥𝑅𝑦𝑦𝑅𝑧)))
104 ancom 465 . . . . . . . . . . . . . . 15 ((𝑥𝐴𝑦𝐴) ↔ (𝑦𝐴𝑥𝐴))
105104anbi1i 731 . . . . . . . . . . . . . 14 (((𝑥𝐴𝑦𝐴) ∧ (𝑦𝐴𝑧𝐴)) ↔ ((𝑦𝐴𝑥𝐴) ∧ (𝑦𝐴𝑧𝐴)))
106 brxp 5181 . . . . . . . . . . . . . . 15 (𝑥(𝐴 × 𝐴)𝑦 ↔ (𝑥𝐴𝑦𝐴))
107 brxp 5181 . . . . . . . . . . . . . . 15 (𝑦(𝐴 × 𝐴)𝑧 ↔ (𝑦𝐴𝑧𝐴))
108106, 107anbi12i 733 . . . . . . . . . . . . . 14 ((𝑥(𝐴 × 𝐴)𝑦𝑦(𝐴 × 𝐴)𝑧) ↔ ((𝑥𝐴𝑦𝐴) ∧ (𝑦𝐴𝑧𝐴)))
109 anandi 888 . . . . . . . . . . . . . 14 ((𝑦𝐴 ∧ (𝑥𝐴𝑧𝐴)) ↔ ((𝑦𝐴𝑥𝐴) ∧ (𝑦𝐴𝑧𝐴)))
110105, 108, 1093bitr4i 292 . . . . . . . . . . . . 13 ((𝑥(𝐴 × 𝐴)𝑦𝑦(𝐴 × 𝐴)𝑧) ↔ (𝑦𝐴 ∧ (𝑥𝐴𝑧𝐴)))
111110anbi1i 731 . . . . . . . . . . . 12 (((𝑥(𝐴 × 𝐴)𝑦𝑦(𝐴 × 𝐴)𝑧) ∧ (𝑥𝑅𝑦𝑦𝑅𝑧)) ↔ ((𝑦𝐴 ∧ (𝑥𝐴𝑧𝐴)) ∧ (𝑥𝑅𝑦𝑦𝑅𝑧)))
112102, 103, 1113bitri 286 . . . . . . . . . . 11 (((𝑥𝑅𝑦𝑥(𝐴 × 𝐴)𝑦) ∧ (𝑦𝑅𝑧𝑦(𝐴 × 𝐴)𝑧)) ↔ ((𝑦𝐴 ∧ (𝑥𝐴𝑧𝐴)) ∧ (𝑥𝑅𝑦𝑦𝑅𝑧)))
113 anass 682 . . . . . . . . . . 11 (((𝑦𝐴 ∧ (𝑥𝐴𝑧𝐴)) ∧ (𝑥𝑅𝑦𝑦𝑅𝑧)) ↔ (𝑦𝐴 ∧ ((𝑥𝐴𝑧𝐴) ∧ (𝑥𝑅𝑦𝑦𝑅𝑧))))
114101, 112, 1133bitri 286 . . . . . . . . . 10 ((𝑥(𝑅 ∩ (𝐴 × 𝐴))𝑦𝑦(𝑅 ∩ (𝐴 × 𝐴))𝑧) ↔ (𝑦𝐴 ∧ ((𝑥𝐴𝑧𝐴) ∧ (𝑥𝑅𝑦𝑦𝑅𝑧))))
115114exbii 1814 . . . . . . . . 9 (∃𝑦(𝑥(𝑅 ∩ (𝐴 × 𝐴))𝑦𝑦(𝑅 ∩ (𝐴 × 𝐴))𝑧) ↔ ∃𝑦(𝑦𝐴 ∧ ((𝑥𝐴𝑧𝐴) ∧ (𝑥𝑅𝑦𝑦𝑅𝑧))))
11642, 72brco 5325 . . . . . . . . . 10 (𝑥((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴)))𝑧 ↔ ∃𝑦(𝑥(𝑅 ∩ (𝐴 × 𝐴))𝑦𝑦(𝑅 ∩ (𝐴 × 𝐴))𝑧))
117 df-br 4686 . . . . . . . . . 10 (𝑥((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴)))𝑧 ↔ ⟨𝑥, 𝑧⟩ ∈ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))))
118116, 117bitr3i 266 . . . . . . . . 9 (∃𝑦(𝑥(𝑅 ∩ (𝐴 × 𝐴))𝑦𝑦(𝑅 ∩ (𝐴 × 𝐴))𝑧) ↔ ⟨𝑥, 𝑧⟩ ∈ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))))
119 df-rex 2947 . . . . . . . . . 10 (∃𝑦𝐴 ((𝑥𝐴𝑧𝐴) ∧ (𝑥𝑅𝑦𝑦𝑅𝑧)) ↔ ∃𝑦(𝑦𝐴 ∧ ((𝑥𝐴𝑧𝐴) ∧ (𝑥𝑅𝑦𝑦𝑅𝑧))))
120 r19.42v 3121 . . . . . . . . . 10 (∃𝑦𝐴 ((𝑥𝐴𝑧𝐴) ∧ (𝑥𝑅𝑦𝑦𝑅𝑧)) ↔ ((𝑥𝐴𝑧𝐴) ∧ ∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧)))
121119, 120bitr3i 266 . . . . . . . . 9 (∃𝑦(𝑦𝐴 ∧ ((𝑥𝐴𝑧𝐴) ∧ (𝑥𝑅𝑦𝑦𝑅𝑧))) ↔ ((𝑥𝐴𝑧𝐴) ∧ ∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧)))
122115, 118, 1213bitr3ri 291 . . . . . . . 8 (((𝑥𝐴𝑧𝐴) ∧ ∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧)) ↔ ⟨𝑥, 𝑧⟩ ∈ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))))
123 df-br 4686 . . . . . . . 8 (𝑥𝑅𝑧 ↔ ⟨𝑥, 𝑧⟩ ∈ 𝑅)
124122, 123imbi12i 339 . . . . . . 7 ((((𝑥𝐴𝑧𝐴) ∧ ∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧)) → 𝑥𝑅𝑧) ↔ (⟨𝑥, 𝑧⟩ ∈ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) → ⟨𝑥, 𝑧⟩ ∈ 𝑅))
1251242albii 1788 . . . . . 6 (∀𝑥𝑧(((𝑥𝐴𝑧𝐴) ∧ ∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧)) → 𝑥𝑅𝑧) ↔ ∀𝑥𝑧(⟨𝑥, 𝑧⟩ ∈ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) → ⟨𝑥, 𝑧⟩ ∈ 𝑅))
126 r2al 2968 . . . . . . 7 (∀𝑥𝐴𝑧𝐴 (∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧) ↔ ∀𝑥𝑧((𝑥𝐴𝑧𝐴) → (∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)))
127 impexp 461 . . . . . . . 8 ((((𝑥𝐴𝑧𝐴) ∧ ∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧)) → 𝑥𝑅𝑧) ↔ ((𝑥𝐴𝑧𝐴) → (∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)))
1281272albii 1788 . . . . . . 7 (∀𝑥𝑧(((𝑥𝐴𝑧𝐴) ∧ ∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧)) → 𝑥𝑅𝑧) ↔ ∀𝑥𝑧((𝑥𝐴𝑧𝐴) → (∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)))
129126, 128bitr4i 267 . . . . . 6 (∀𝑥𝐴𝑧𝐴 (∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧) ↔ ∀𝑥𝑧(((𝑥𝐴𝑧𝐴) ∧ ∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧)) → 𝑥𝑅𝑧))
130 relco 5671 . . . . . . 7 Rel ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴)))
131 ssrel 5241 . . . . . . 7 (Rel ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) → (((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) ⊆ 𝑅 ↔ ∀𝑥𝑧(⟨𝑥, 𝑧⟩ ∈ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) → ⟨𝑥, 𝑧⟩ ∈ 𝑅)))
132130, 131ax-mp 5 . . . . . 6 (((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) ⊆ 𝑅 ↔ ∀𝑥𝑧(⟨𝑥, 𝑧⟩ ∈ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) → ⟨𝑥, 𝑧⟩ ∈ 𝑅))
133125, 129, 1323bitr4i 292 . . . . 5 (∀𝑥𝐴𝑧𝐴 (∃𝑦𝐴 (𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧) ↔ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) ⊆ 𝑅)
13498, 133bitr2i 265 . . . 4 (((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) ⊆ 𝑅 ↔ ∀𝑥𝐴𝑦𝐴𝑧𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))
13593, 134anbi12i 733 . . 3 (((𝑅 ∩ ( I ↾ 𝐴)) = ∅ ∧ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) ⊆ 𝑅) ↔ (∀𝑥𝐴 ¬ 𝑥𝑅𝑥 ∧ ∀𝑥𝐴𝑦𝐴𝑧𝐴 ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)))
13633, 34, 1353bitr4g 303 . 2 (𝐴 ≠ ∅ → (𝑅 Po 𝐴 ↔ ((𝑅 ∩ ( I ↾ 𝐴)) = ∅ ∧ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) ⊆ 𝑅)))
13726, 136pm2.61ine 2906 1 (𝑅 Po 𝐴 ↔ ((𝑅 ∩ ( I ↾ 𝐴)) = ∅ ∧ ((𝑅 ∩ (𝐴 × 𝐴)) ∘ (𝑅 ∩ (𝐴 × 𝐴))) ⊆ 𝑅))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 196   ∧ wa 383  ∀wal 1521   = wceq 1523  ∃wex 1744   ∈ wcel 2030   ≠ wne 2823  ∀wral 2941  ∃wrex 2942  Vcvv 3231   ∩ cin 3606   ⊆ wss 3607  ∅c0 3948  ⟨cop 4216   class class class wbr 4685   I cid 5052   Po wpo 5062   × cxp 5141   ↾ cres 5145   ∘ ccom 5147  Rel wrel 5148 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pr 4936 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-rab 2950  df-v 3233  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-sn 4211  df-pr 4213  df-op 4217  df-br 4686  df-opab 4746  df-id 5053  df-po 5064  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-res 5155 This theorem is referenced by: (None)
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