Theorem kmlem2 10123

Description: Lemma for 5-quantifier AC of Kurt Maes, Th. 4, part of 3 => 4. (Contributed by NM, 25-Mar-2004.)

Assertion

Ref	Expression
kmlem2	⊢ (∃𝑦∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦)) ↔ ∃𝑦(¬ 𝑦 ∈ 𝑥 ∧ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦))))

Distinct variable groups:   𝑥,𝑦,𝜑   𝑥,𝑤,𝑦,𝑧

Allowed substitution hints:   𝜑(𝑧,𝑤)

Proof of Theorem kmlem2

Dummy variables 𝑣 𝑢 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		ineq2 4169	. . . . . . . 8 ⊢ (𝑦 = 𝑣 → (𝑧 ∩ 𝑦) = (𝑧 ∩ 𝑣))
2	1	eleq2d 2851	. . . . . . 7 ⊢ (𝑦 = 𝑣 → (𝑤 ∈ (𝑧 ∩ 𝑦) ↔ 𝑤 ∈ (𝑧 ∩ 𝑣)))
3	2	eubidv 2616	. . . . . 6 ⊢ (𝑦 = 𝑣 → (∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦) ↔ ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑣)))
4	3	imbi2d 343	. . . . 5 ⊢ (𝑦 = 𝑣 → ((𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦)) ↔ (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑣))))
5	4	ralbidv 3188	. . . 4 ⊢ (𝑦 = 𝑣 → (∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦)) ↔ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑣))))
6	5	cbvexvw 2060	. . 3 ⊢ (∃𝑦∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦)) ↔ ∃𝑣∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑣)))
7		indi 4239	. . . . . . . . . . . 12 ⊢ (𝑧 ∩ (𝑣 ∪ {𝑢})) = ((𝑧 ∩ 𝑣) ∪ (𝑧 ∩ {𝑢}))
8		elssuni 4900	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 ∈ 𝑥 → 𝑧 ⊆ ∪ 𝑥)
9	8	ssneld 3941	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 ∈ 𝑥 → (¬ 𝑢 ∈ ∪ 𝑥 → ¬ 𝑢 ∈ 𝑧))
10		disjsn 4673	. . . . . . . . . . . . . . . 16 ⊢ ((𝑧 ∩ {𝑢}) = ∅ ↔ ¬ 𝑢 ∈ 𝑧)
11	9, 10	imbitrrdi 255	. . . . . . . . . . . . . . 15 ⊢ (𝑧 ∈ 𝑥 → (¬ 𝑢 ∈ ∪ 𝑥 → (𝑧 ∩ {𝑢}) = ∅))
12	11	impcom 412	. . . . . . . . . . . . . 14 ⊢ ((¬ 𝑢 ∈ ∪ 𝑥 ∧ 𝑧 ∈ 𝑥) → (𝑧 ∩ {𝑢}) = ∅)
13	12	uneq2d 4124	. . . . . . . . . . . . 13 ⊢ ((¬ 𝑢 ∈ ∪ 𝑥 ∧ 𝑧 ∈ 𝑥) → ((𝑧 ∩ 𝑣) ∪ (𝑧 ∩ {𝑢})) = ((𝑧 ∩ 𝑣) ∪ ∅))
14		un0 4351	. . . . . . . . . . . . 13 ⊢ ((𝑧 ∩ 𝑣) ∪ ∅) = (𝑧 ∩ 𝑣)
15	13, 14	eqtrdi 2816	. . . . . . . . . . . 12 ⊢ ((¬ 𝑢 ∈ ∪ 𝑥 ∧ 𝑧 ∈ 𝑥) → ((𝑧 ∩ 𝑣) ∪ (𝑧 ∩ {𝑢})) = (𝑧 ∩ 𝑣))
16	7, 15	eqtr2id 2813	. . . . . . . . . . 11 ⊢ ((¬ 𝑢 ∈ ∪ 𝑥 ∧ 𝑧 ∈ 𝑥) → (𝑧 ∩ 𝑣) = (𝑧 ∩ (𝑣 ∪ {𝑢})))
17	16	eleq2d 2851	. . . . . . . . . 10 ⊢ ((¬ 𝑢 ∈ ∪ 𝑥 ∧ 𝑧 ∈ 𝑥) → (𝑤 ∈ (𝑧 ∩ 𝑣) ↔ 𝑤 ∈ (𝑧 ∩ (𝑣 ∪ {𝑢}))))
18	17	eubidv 2616	. . . . . . . . 9 ⊢ ((¬ 𝑢 ∈ ∪ 𝑥 ∧ 𝑧 ∈ 𝑥) → (∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑣) ↔ ∃!𝑤 𝑤 ∈ (𝑧 ∩ (𝑣 ∪ {𝑢}))))
19	18	imbi2d 343	. . . . . . . 8 ⊢ ((¬ 𝑢 ∈ ∪ 𝑥 ∧ 𝑧 ∈ 𝑥) → ((𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑣)) ↔ (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ (𝑣 ∪ {𝑢})))))
20	19	ralbidva 3186	. . . . . . 7 ⊢ (¬ 𝑢 ∈ ∪ 𝑥 → (∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑣)) ↔ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ (𝑣 ∪ {𝑢})))))
21		vsnid 4625	. . . . . . . . . . . 12 ⊢ 𝑢 ∈ {𝑢}
22	21	olci 879	. . . . . . . . . . 11 ⊢ (𝑢 ∈ 𝑣 ∨ 𝑢 ∈ {𝑢})
23		elun 4109	. . . . . . . . . . 11 ⊢ (𝑢 ∈ (𝑣 ∪ {𝑢}) ↔ (𝑢 ∈ 𝑣 ∨ 𝑢 ∈ {𝑢}))
24	22, 23	mpbir 234	. . . . . . . . . 10 ⊢ 𝑢 ∈ (𝑣 ∪ {𝑢})
25		elssuni 4900	. . . . . . . . . . 11 ⊢ ((𝑣 ∪ {𝑢}) ∈ 𝑥 → (𝑣 ∪ {𝑢}) ⊆ ∪ 𝑥)
26	25	sseld 3938	. . . . . . . . . 10 ⊢ ((𝑣 ∪ {𝑢}) ∈ 𝑥 → (𝑢 ∈ (𝑣 ∪ {𝑢}) → 𝑢 ∈ ∪ 𝑥))
27	24, 26	mpi 21	. . . . . . . . 9 ⊢ ((𝑣 ∪ {𝑢}) ∈ 𝑥 → 𝑢 ∈ ∪ 𝑥)
28	27	con3i 155	. . . . . . . 8 ⊢ (¬ 𝑢 ∈ ∪ 𝑥 → ¬ (𝑣 ∪ {𝑢}) ∈ 𝑥)
29	28	biantrurd 541	. . . . . . 7 ⊢ (¬ 𝑢 ∈ ∪ 𝑥 → (∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ (𝑣 ∪ {𝑢}))) ↔ (¬ (𝑣 ∪ {𝑢}) ∈ 𝑥 ∧ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ (𝑣 ∪ {𝑢}))))))
30	20, 29	bitrd 282	. . . . . 6 ⊢ (¬ 𝑢 ∈ ∪ 𝑥 → (∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑣)) ↔ (¬ (𝑣 ∪ {𝑢}) ∈ 𝑥 ∧ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ (𝑣 ∪ {𝑢}))))))
31		vex 3461	. . . . . . . 8 ⊢ 𝑣 ∈ V
32		vsnex 5397	. . . . . . . 8 ⊢ {𝑢} ∈ V
33	31, 32	unex 7731	. . . . . . 7 ⊢ (𝑣 ∪ {𝑢}) ∈ V
34		eleq1 2853	. . . . . . . . 9 ⊢ (𝑦 = (𝑣 ∪ {𝑢}) → (𝑦 ∈ 𝑥 ↔ (𝑣 ∪ {𝑢}) ∈ 𝑥))
35	34	notbid 321	. . . . . . . 8 ⊢ (𝑦 = (𝑣 ∪ {𝑢}) → (¬ 𝑦 ∈ 𝑥 ↔ ¬ (𝑣 ∪ {𝑢}) ∈ 𝑥))
36		ineq2 4169	. . . . . . . . . . . 12 ⊢ (𝑦 = (𝑣 ∪ {𝑢}) → (𝑧 ∩ 𝑦) = (𝑧 ∩ (𝑣 ∪ {𝑢})))
37	36	eleq2d 2851	. . . . . . . . . . 11 ⊢ (𝑦 = (𝑣 ∪ {𝑢}) → (𝑤 ∈ (𝑧 ∩ 𝑦) ↔ 𝑤 ∈ (𝑧 ∩ (𝑣 ∪ {𝑢}))))
38	37	eubidv 2616	. . . . . . . . . 10 ⊢ (𝑦 = (𝑣 ∪ {𝑢}) → (∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦) ↔ ∃!𝑤 𝑤 ∈ (𝑧 ∩ (𝑣 ∪ {𝑢}))))
39	38	imbi2d 343	. . . . . . . . 9 ⊢ (𝑦 = (𝑣 ∪ {𝑢}) → ((𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦)) ↔ (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ (𝑣 ∪ {𝑢})))))
40	39	ralbidv 3188	. . . . . . . 8 ⊢ (𝑦 = (𝑣 ∪ {𝑢}) → (∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦)) ↔ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ (𝑣 ∪ {𝑢})))))
41	35, 40	anbi12d 643	. . . . . . 7 ⊢ (𝑦 = (𝑣 ∪ {𝑢}) → ((¬ 𝑦 ∈ 𝑥 ∧ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦))) ↔ (¬ (𝑣 ∪ {𝑢}) ∈ 𝑥 ∧ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ (𝑣 ∪ {𝑢}))))))
42	33, 41	spcev 3568	. . . . . 6 ⊢ ((¬ (𝑣 ∪ {𝑢}) ∈ 𝑥 ∧ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ (𝑣 ∪ {𝑢})))) → ∃𝑦(¬ 𝑦 ∈ 𝑥 ∧ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦))))
43	30, 42	biimtrdi 256	. . . . 5 ⊢ (¬ 𝑢 ∈ ∪ 𝑥 → (∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑣)) → ∃𝑦(¬ 𝑦 ∈ 𝑥 ∧ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦)))))
44		vuniex 7726	. . . . . 6 ⊢ ∪ 𝑥 ∈ V
45		eleq2 2854	. . . . . . . 8 ⊢ (𝑦 = ∪ 𝑥 → (𝑢 ∈ 𝑦 ↔ 𝑢 ∈ ∪ 𝑥))
46	45	notbid 321	. . . . . . 7 ⊢ (𝑦 = ∪ 𝑥 → (¬ 𝑢 ∈ 𝑦 ↔ ¬ 𝑢 ∈ ∪ 𝑥))
47	46	exbidv 1944	. . . . . 6 ⊢ (𝑦 = ∪ 𝑥 → (∃𝑢 ¬ 𝑢 ∈ 𝑦 ↔ ∃𝑢 ¬ 𝑢 ∈ ∪ 𝑥))
48		exnelv 5268	. . . . . 6 ⊢ ∃𝑢 ¬ 𝑢 ∈ 𝑦
49	44, 47, 48	vtocl 3528	. . . . 5 ⊢ ∃𝑢 ¬ 𝑢 ∈ ∪ 𝑥
50	43, 49	exlimiiv 1954	. . . 4 ⊢ (∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑣)) → ∃𝑦(¬ 𝑦 ∈ 𝑥 ∧ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦))))
51	50	exlimiv 1953	. . 3 ⊢ (∃𝑣∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑣)) → ∃𝑦(¬ 𝑦 ∈ 𝑥 ∧ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦))))
52	6, 51	sylbi 220	. 2 ⊢ (∃𝑦∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦)) → ∃𝑦(¬ 𝑦 ∈ 𝑥 ∧ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦))))
53		exsimpr 1892	. 2 ⊢ (∃𝑦(¬ 𝑦 ∈ 𝑥 ∧ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦))) → ∃𝑦∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦)))
54	52, 53	impbii 212	1 ⊢ (∃𝑦∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦)) ↔ ∃𝑦(¬ 𝑦 ∈ 𝑥 ∧ ∀𝑧 ∈ 𝑥 (𝜑 → ∃!𝑤 𝑤 ∈ (𝑧 ∩ 𝑦))))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 209   ∧ wa 400   ∨ wo 860   = wceq 1563  ∃wex 1802   ∈ wcel 2145  ∃!weu 2598  ∀wral 3079   ∪ cun 3905   ∩ cin 3906  ∅c0 4288  {csn 4585  ∪ cuni 4868

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1818  ax-4 1832  ax-5 1933  ax-6 1990  ax-7 2031  ax-8 2147  ax-9 2155  ax-ext 2737  ax-sep 5251  ax-pr 5395  ax-un 7722

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-tru 1566  df-fal 1576  df-ex 1803  df-sb 2094  df-mo 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-ral 3080  df-rab 3418  df-v 3459  df-dif 3910  df-un 3912  df-in 3914  df-ss 3924  df-nul 4289  df-sn 4586  df-pr 4588  df-uni 4869

This theorem is referenced by:  kmlem8  10129