Theorem otiunsndisj 5520

Description: The union of singletons consisting of ordered triples which have distinct first and third components are disjoint. (Contributed by Alexander van der Vekens, 10-Mar-2018.)

Assertion

Ref	Expression
otiunsndisj	⊢ (𝐵 ∈ 𝑋 → Disj 𝑎 ∈ 𝑉 ∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩})

Distinct variable groups:   𝐵,𝑎,𝑐   𝑉,𝑎,𝑐   𝑊,𝑎,𝑐   𝑋,𝑎,𝑐

Proof of Theorem otiunsndisj

Dummy variables 𝑑 𝑒 𝑠 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		eliun 5001	. . . . . . . . . 10 ⊢ (𝑠 ∈ ∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩} ↔ ∃𝑐 ∈ (𝑊 ∖ {𝑎})𝑠 ∈ {⟨𝑎, 𝐵, 𝑐⟩})
2		otthg 5485	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ ((𝑎 ∈ 𝑉 ∧ 𝐵 ∈ 𝑋 ∧ 𝑐 ∈ (𝑊 ∖ {𝑎})) → (⟨𝑎, 𝐵, 𝑐⟩ = ⟨𝑑, 𝐵, 𝑒⟩ ↔ (𝑎 = 𝑑 ∧ 𝐵 = 𝐵 ∧ 𝑐 = 𝑒)))
3		simp1 1135	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ ((𝑎 = 𝑑 ∧ 𝐵 = 𝐵 ∧ 𝑐 = 𝑒) → 𝑎 = 𝑑)
4	2, 3	biimtrdi 252	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((𝑎 ∈ 𝑉 ∧ 𝐵 ∈ 𝑋 ∧ 𝑐 ∈ (𝑊 ∖ {𝑎})) → (⟨𝑎, 𝐵, 𝑐⟩ = ⟨𝑑, 𝐵, 𝑒⟩ → 𝑎 = 𝑑))
5	4	con3d 152	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((𝑎 ∈ 𝑉 ∧ 𝐵 ∈ 𝑋 ∧ 𝑐 ∈ (𝑊 ∖ {𝑎})) → (¬ 𝑎 = 𝑑 → ¬ ⟨𝑎, 𝐵, 𝑐⟩ = ⟨𝑑, 𝐵, 𝑒⟩))
6	5	3exp 1118	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑎 ∈ 𝑉 → (𝐵 ∈ 𝑋 → (𝑐 ∈ (𝑊 ∖ {𝑎}) → (¬ 𝑎 = 𝑑 → ¬ ⟨𝑎, 𝐵, 𝑐⟩ = ⟨𝑑, 𝐵, 𝑒⟩))))
7	6	impcom 407	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉) → (𝑐 ∈ (𝑊 ∖ {𝑎}) → (¬ 𝑎 = 𝑑 → ¬ ⟨𝑎, 𝐵, 𝑐⟩ = ⟨𝑑, 𝐵, 𝑒⟩)))
8	7	com3r 87	. . . . . . . . . . . . . . . . . 18 ⊢ (¬ 𝑎 = 𝑑 → ((𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉) → (𝑐 ∈ (𝑊 ∖ {𝑎}) → ¬ ⟨𝑎, 𝐵, 𝑐⟩ = ⟨𝑑, 𝐵, 𝑒⟩)))
9	8	imp31 417	. . . . . . . . . . . . . . . . 17 ⊢ (((¬ 𝑎 = 𝑑 ∧ (𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉)) ∧ 𝑐 ∈ (𝑊 ∖ {𝑎})) → ¬ ⟨𝑎, 𝐵, 𝑐⟩ = ⟨𝑑, 𝐵, 𝑒⟩)
10		velsn 4644	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑠 ∈ {⟨𝑎, 𝐵, 𝑐⟩} ↔ 𝑠 = ⟨𝑎, 𝐵, 𝑐⟩)
11		eqeq1 2735	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑠 = ⟨𝑎, 𝐵, 𝑐⟩ → (𝑠 = ⟨𝑑, 𝐵, 𝑒⟩ ↔ ⟨𝑎, 𝐵, 𝑐⟩ = ⟨𝑑, 𝐵, 𝑒⟩))
12	11	notbid 318	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑠 = ⟨𝑎, 𝐵, 𝑐⟩ → (¬ 𝑠 = ⟨𝑑, 𝐵, 𝑒⟩ ↔ ¬ ⟨𝑎, 𝐵, 𝑐⟩ = ⟨𝑑, 𝐵, 𝑒⟩))
13	10, 12	sylbi 216	. . . . . . . . . . . . . . . . 17 ⊢ (𝑠 ∈ {⟨𝑎, 𝐵, 𝑐⟩} → (¬ 𝑠 = ⟨𝑑, 𝐵, 𝑒⟩ ↔ ¬ ⟨𝑎, 𝐵, 𝑐⟩ = ⟨𝑑, 𝐵, 𝑒⟩))
14	9, 13	syl5ibrcom 246	. . . . . . . . . . . . . . . 16 ⊢ (((¬ 𝑎 = 𝑑 ∧ (𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉)) ∧ 𝑐 ∈ (𝑊 ∖ {𝑎})) → (𝑠 ∈ {⟨𝑎, 𝐵, 𝑐⟩} → ¬ 𝑠 = ⟨𝑑, 𝐵, 𝑒⟩))
15	14	imp 406	. . . . . . . . . . . . . . 15 ⊢ ((((¬ 𝑎 = 𝑑 ∧ (𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉)) ∧ 𝑐 ∈ (𝑊 ∖ {𝑎})) ∧ 𝑠 ∈ {⟨𝑎, 𝐵, 𝑐⟩}) → ¬ 𝑠 = ⟨𝑑, 𝐵, 𝑒⟩)
16		velsn 4644	. . . . . . . . . . . . . . 15 ⊢ (𝑠 ∈ {⟨𝑑, 𝐵, 𝑒⟩} ↔ 𝑠 = ⟨𝑑, 𝐵, 𝑒⟩)
17	15, 16	sylnibr 329	. . . . . . . . . . . . . 14 ⊢ ((((¬ 𝑎 = 𝑑 ∧ (𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉)) ∧ 𝑐 ∈ (𝑊 ∖ {𝑎})) ∧ 𝑠 ∈ {⟨𝑎, 𝐵, 𝑐⟩}) → ¬ 𝑠 ∈ {⟨𝑑, 𝐵, 𝑒⟩})
18	17	adantr 480	. . . . . . . . . . . . 13 ⊢ (((((¬ 𝑎 = 𝑑 ∧ (𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉)) ∧ 𝑐 ∈ (𝑊 ∖ {𝑎})) ∧ 𝑠 ∈ {⟨𝑎, 𝐵, 𝑐⟩}) ∧ 𝑒 ∈ (𝑊 ∖ {𝑑})) → ¬ 𝑠 ∈ {⟨𝑑, 𝐵, 𝑒⟩})
19	18	nrexdv 3148	. . . . . . . . . . . 12 ⊢ ((((¬ 𝑎 = 𝑑 ∧ (𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉)) ∧ 𝑐 ∈ (𝑊 ∖ {𝑎})) ∧ 𝑠 ∈ {⟨𝑎, 𝐵, 𝑐⟩}) → ¬ ∃𝑒 ∈ (𝑊 ∖ {𝑑})𝑠 ∈ {⟨𝑑, 𝐵, 𝑒⟩})
20		eliun 5001	. . . . . . . . . . . 12 ⊢ (𝑠 ∈ ∪ 𝑒 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑒⟩} ↔ ∃𝑒 ∈ (𝑊 ∖ {𝑑})𝑠 ∈ {⟨𝑑, 𝐵, 𝑒⟩})
21	19, 20	sylnibr 329	. . . . . . . . . . 11 ⊢ ((((¬ 𝑎 = 𝑑 ∧ (𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉)) ∧ 𝑐 ∈ (𝑊 ∖ {𝑎})) ∧ 𝑠 ∈ {⟨𝑎, 𝐵, 𝑐⟩}) → ¬ 𝑠 ∈ ∪ 𝑒 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑒⟩})
22	21	rexlimdva2 3156	. . . . . . . . . 10 ⊢ ((¬ 𝑎 = 𝑑 ∧ (𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉)) → (∃𝑐 ∈ (𝑊 ∖ {𝑎})𝑠 ∈ {⟨𝑎, 𝐵, 𝑐⟩} → ¬ 𝑠 ∈ ∪ 𝑒 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑒⟩}))
23	1, 22	biimtrid 241	. . . . . . . . 9 ⊢ ((¬ 𝑎 = 𝑑 ∧ (𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉)) → (𝑠 ∈ ∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩} → ¬ 𝑠 ∈ ∪ 𝑒 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑒⟩}))
24	23	ralrimiv 3144	. . . . . . . 8 ⊢ ((¬ 𝑎 = 𝑑 ∧ (𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉)) → ∀𝑠 ∈ ∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩} ¬ 𝑠 ∈ ∪ 𝑒 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑒⟩})
25		oteq3 4884	. . . . . . . . . . . . 13 ⊢ (𝑐 = 𝑒 → ⟨𝑑, 𝐵, 𝑐⟩ = ⟨𝑑, 𝐵, 𝑒⟩)
26	25	sneqd 4640	. . . . . . . . . . . 12 ⊢ (𝑐 = 𝑒 → {⟨𝑑, 𝐵, 𝑐⟩} = {⟨𝑑, 𝐵, 𝑒⟩})
27	26	cbviunv 5043	. . . . . . . . . . 11 ⊢ ∪ 𝑐 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑐⟩} = ∪ 𝑒 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑒⟩}
28	27	eleq2i 2824	. . . . . . . . . 10 ⊢ (𝑠 ∈ ∪ 𝑐 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑐⟩} ↔ 𝑠 ∈ ∪ 𝑒 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑒⟩})
29	28	notbii 320	. . . . . . . . 9 ⊢ (¬ 𝑠 ∈ ∪ 𝑐 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑐⟩} ↔ ¬ 𝑠 ∈ ∪ 𝑒 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑒⟩})
30	29	ralbii 3092	. . . . . . . 8 ⊢ (∀𝑠 ∈ ∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩} ¬ 𝑠 ∈ ∪ 𝑐 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑐⟩} ↔ ∀𝑠 ∈ ∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩} ¬ 𝑠 ∈ ∪ 𝑒 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑒⟩})
31	24, 30	sylibr 233	. . . . . . 7 ⊢ ((¬ 𝑎 = 𝑑 ∧ (𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉)) → ∀𝑠 ∈ ∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩} ¬ 𝑠 ∈ ∪ 𝑐 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑐⟩})
32		disj 4447	. . . . . . 7 ⊢ ((∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩} ∩ ∪ 𝑐 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑐⟩}) = ∅ ↔ ∀𝑠 ∈ ∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩} ¬ 𝑠 ∈ ∪ 𝑐 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑐⟩})
33	31, 32	sylibr 233	. . . . . 6 ⊢ ((¬ 𝑎 = 𝑑 ∧ (𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉)) → (∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩} ∩ ∪ 𝑐 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑐⟩}) = ∅)
34	33	expcom 413	. . . . 5 ⊢ ((𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉) → (¬ 𝑎 = 𝑑 → (∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩} ∩ ∪ 𝑐 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑐⟩}) = ∅))
35	34	orrd 860	. . . 4 ⊢ ((𝐵 ∈ 𝑋 ∧ 𝑎 ∈ 𝑉) → (𝑎 = 𝑑 ∨ (∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩} ∩ ∪ 𝑐 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑐⟩}) = ∅))
36	35	adantrr 714	. . 3 ⊢ ((𝐵 ∈ 𝑋 ∧ (𝑎 ∈ 𝑉 ∧ 𝑑 ∈ 𝑉)) → (𝑎 = 𝑑 ∨ (∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩} ∩ ∪ 𝑐 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑐⟩}) = ∅))
37	36	ralrimivva 3199	. 2 ⊢ (𝐵 ∈ 𝑋 → ∀𝑎 ∈ 𝑉 ∀𝑑 ∈ 𝑉 (𝑎 = 𝑑 ∨ (∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩} ∩ ∪ 𝑐 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑐⟩}) = ∅))
38		sneq 4638	. . . 4 ⊢ (𝑎 = 𝑑 → {𝑎} = {𝑑})
39	38	difeq2d 4122	. . 3 ⊢ (𝑎 = 𝑑 → (𝑊 ∖ {𝑎}) = (𝑊 ∖ {𝑑}))
40		oteq1 4882	. . . 4 ⊢ (𝑎 = 𝑑 → ⟨𝑎, 𝐵, 𝑐⟩ = ⟨𝑑, 𝐵, 𝑐⟩)
41	40	sneqd 4640	. . 3 ⊢ (𝑎 = 𝑑 → {⟨𝑎, 𝐵, 𝑐⟩} = {⟨𝑑, 𝐵, 𝑐⟩})
42	39, 41	disjiunb 5137	. 2 ⊢ (Disj 𝑎 ∈ 𝑉 ∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩} ↔ ∀𝑎 ∈ 𝑉 ∀𝑑 ∈ 𝑉 (𝑎 = 𝑑 ∨ (∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩} ∩ ∪ 𝑐 ∈ (𝑊 ∖ {𝑑}){⟨𝑑, 𝐵, 𝑐⟩}) = ∅))
43	37, 42	sylibr 233	1 ⊢ (𝐵 ∈ 𝑋 → Disj 𝑎 ∈ 𝑉 ∪ 𝑐 ∈ (𝑊 ∖ {𝑎}){⟨𝑎, 𝐵, 𝑐⟩})

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 205   ∧ wa 395   ∨ wo 844   ∧ w3a 1086   = wceq 1540   ∈ wcel 2105  ∀wral 3060  ∃wrex 3069   ∖ cdif 3945   ∩ cin 3947  ∅c0 4322  {csn 4628  ⟨cotp 4636  ∪ ciun 4997  Disj wdisj 5113

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1912  ax-6 1970  ax-7 2010  ax-8 2107  ax-9 2115  ax-11 2153  ax-12 2170  ax-ext 2702  ax-sep 5299  ax-nul 5306  ax-pr 5427

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1781  df-nf 1785  df-sb 2067  df-mo 2533  df-clab 2709  df-cleq 2723  df-clel 2809  df-nfc 2884  df-ral 3061  df-rex 3070  df-rmo 3375  df-rab 3432  df-v 3475  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-nul 4323  df-if 4529  df-sn 4629  df-pr 4631  df-op 4635  df-ot 4637  df-iun 4999  df-disj 5114

This theorem is referenced by: (None)