Theorem aceq3lem 10116

Description: Lemma for dfac3 10117. (Contributed by NM, 2-Apr-2004.) (Revised by Mario Carneiro, 26-Jun-2015.)

Hypothesis

Ref	Expression
aceq3lem.1	⊢ 𝐹 = (𝑤 ∈ dom 𝑦 ↦ (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}))

Assertion

Ref	Expression
aceq3lem	⊢ (∀𝑥∃𝑓∀𝑧 ∈ 𝑥 (𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) → ∃𝑓(𝑓 ⊆ 𝑦 ∧ 𝑓 Fn dom 𝑦))

Distinct variable group:   𝑥,𝑦,𝑧,𝑤,𝑢,𝑓

Allowed substitution hints:   𝐹(𝑥, 𝑦, 𝑧, 𝑤, 𝑢, 𝑓)

Proof of Theorem aceq3lem

Dummy variables ℎ 𝑔 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		vex 3461	. . . . . 6 ⊢ 𝑦 ∈ V
2	1	rnex 7909	. . . . 5 ⊢ ran 𝑦 ∈ V
3	2	pwex 5353	. . . 4 ⊢ 𝒫 ran 𝑦 ∈ V
4		raleq 3322	. . . . 5 ⊢ (𝑥 = 𝒫 ran 𝑦 → (∀𝑧 ∈ 𝑥 (𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) ↔ ∀𝑧 ∈ 𝒫 ran 𝑦(𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧)))
5	4	exbidv 1954	. . . 4 ⊢ (𝑥 = 𝒫 ran 𝑦 → (∃𝑓∀𝑧 ∈ 𝑥 (𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) ↔ ∃𝑓∀𝑧 ∈ 𝒫 ran 𝑦(𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧)))
6	3, 5	spcv 3566	. . 3 ⊢ (∀𝑥∃𝑓∀𝑧 ∈ 𝑥 (𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) → ∃𝑓∀𝑧 ∈ 𝒫 ran 𝑦(𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧))
7		aceq3lem.1	. . . . . . 7 ⊢ 𝐹 = (𝑤 ∈ dom 𝑦 ↦ (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}))
8		df-mpt 5195	. . . . . . 7 ⊢ (𝑤 ∈ dom 𝑦 ↦ (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢})) = {⟨𝑤, ℎ⟩ ∣ (𝑤 ∈ dom 𝑦 ∧ ℎ = (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}))}
9	7, 8	eqtri 2788	. . . . . 6 ⊢ 𝐹 = {⟨𝑤, ℎ⟩ ∣ (𝑤 ∈ dom 𝑦 ∧ ℎ = (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}))}
10		vex 3461	. . . . . . . . . . . . . . 15 ⊢ 𝑤 ∈ V
11	10	eldm 5892	. . . . . . . . . . . . . 14 ⊢ (𝑤 ∈ dom 𝑦 ↔ ∃𝑢 𝑤𝑦𝑢)
12		abn0 4341	. . . . . . . . . . . . . 14 ⊢ ({𝑢 ∣ 𝑤𝑦𝑢} ≠ ∅ ↔ ∃𝑢 𝑤𝑦𝑢)
13	11, 12	bitr4i 281	. . . . . . . . . . . . 13 ⊢ (𝑤 ∈ dom 𝑦 ↔ {𝑢 ∣ 𝑤𝑦𝑢} ≠ ∅)
14		vex 3461	. . . . . . . . . . . . . . . . 17 ⊢ 𝑢 ∈ V
15	10, 14	brelrn 5934	. . . . . . . . . . . . . . . 16 ⊢ (𝑤𝑦𝑢 → 𝑢 ∈ ran 𝑦)
16	15	abssi 4023	. . . . . . . . . . . . . . 15 ⊢ {𝑢 ∣ 𝑤𝑦𝑢} ⊆ ran 𝑦
17	2, 16	elpwi2 5308	. . . . . . . . . . . . . 14 ⊢ {𝑢 ∣ 𝑤𝑦𝑢} ∈ 𝒫 ran 𝑦
18		neeq1 3022	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 = {𝑢 ∣ 𝑤𝑦𝑢} → (𝑧 ≠ ∅ ↔ {𝑢 ∣ 𝑤𝑦𝑢} ≠ ∅))
19		fveq2 6885	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 = {𝑢 ∣ 𝑤𝑦𝑢} → (𝑓‘𝑧) = (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}))
20		id 23	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 = {𝑢 ∣ 𝑤𝑦𝑢} → 𝑧 = {𝑢 ∣ 𝑤𝑦𝑢})
21	19, 20	eleq12d 2859	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 = {𝑢 ∣ 𝑤𝑦𝑢} → ((𝑓‘𝑧) ∈ 𝑧 ↔ (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}) ∈ {𝑢 ∣ 𝑤𝑦𝑢}))
22	18, 21	imbi12d 347	. . . . . . . . . . . . . . 15 ⊢ (𝑧 = {𝑢 ∣ 𝑤𝑦𝑢} → ((𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) ↔ ({𝑢 ∣ 𝑤𝑦𝑢} ≠ ∅ → (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}) ∈ {𝑢 ∣ 𝑤𝑦𝑢})))
23	22	rspcv 3579	. . . . . . . . . . . . . 14 ⊢ ({𝑢 ∣ 𝑤𝑦𝑢} ∈ 𝒫 ran 𝑦 → (∀𝑧 ∈ 𝒫 ran 𝑦(𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) → ({𝑢 ∣ 𝑤𝑦𝑢} ≠ ∅ → (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}) ∈ {𝑢 ∣ 𝑤𝑦𝑢})))
24	17, 23	ax-mp 5	. . . . . . . . . . . . 13 ⊢ (∀𝑧 ∈ 𝒫 ran 𝑦(𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) → ({𝑢 ∣ 𝑤𝑦𝑢} ≠ ∅ → (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}) ∈ {𝑢 ∣ 𝑤𝑦𝑢}))
25	13, 24	biimtrid 245	. . . . . . . . . . . 12 ⊢ (∀𝑧 ∈ 𝒫 ran 𝑦(𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) → (𝑤 ∈ dom 𝑦 → (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}) ∈ {𝑢 ∣ 𝑤𝑦𝑢}))
26	25	imp 412	. . . . . . . . . . 11 ⊢ ((∀𝑧 ∈ 𝒫 ran 𝑦(𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) ∧ 𝑤 ∈ dom 𝑦) → (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}) ∈ {𝑢 ∣ 𝑤𝑦𝑢})
27		fvex 6898	. . . . . . . . . . . 12 ⊢ (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}) ∈ V
28		breq2 5115	. . . . . . . . . . . 12 ⊢ (𝑧 = (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}) → (𝑤𝑦𝑧 ↔ 𝑤𝑦(𝑓‘{𝑢 ∣ 𝑤𝑦𝑢})))
29		breq2 5115	. . . . . . . . . . . . 13 ⊢ (𝑢 = 𝑧 → (𝑤𝑦𝑢 ↔ 𝑤𝑦𝑧))
30	29	cbvabv 2835	. . . . . . . . . . . 12 ⊢ {𝑢 ∣ 𝑤𝑦𝑢} = {𝑧 ∣ 𝑤𝑦𝑧}
31	27, 28, 30	elab2 3643	. . . . . . . . . . 11 ⊢ ((𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}) ∈ {𝑢 ∣ 𝑤𝑦𝑢} ↔ 𝑤𝑦(𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}))
32	26, 31	sylib 221	. . . . . . . . . 10 ⊢ ((∀𝑧 ∈ 𝒫 ran 𝑦(𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) ∧ 𝑤 ∈ dom 𝑦) → 𝑤𝑦(𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}))
33		breq2 5115	. . . . . . . . . 10 ⊢ (ℎ = (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}) → (𝑤𝑦ℎ ↔ 𝑤𝑦(𝑓‘{𝑢 ∣ 𝑤𝑦𝑢})))
34	32, 33	syl5ibrcom 250	. . . . . . . . 9 ⊢ ((∀𝑧 ∈ 𝒫 ran 𝑦(𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) ∧ 𝑤 ∈ dom 𝑦) → (ℎ = (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}) → 𝑤𝑦ℎ))
35	34	expimpd 459	. . . . . . . 8 ⊢ (∀𝑧 ∈ 𝒫 ran 𝑦(𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) → ((𝑤 ∈ dom 𝑦 ∧ ℎ = (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢})) → 𝑤𝑦ℎ))
36	35	ssopab2dv 5538	. . . . . . 7 ⊢ (∀𝑧 ∈ 𝒫 ran 𝑦(𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) → {⟨𝑤, ℎ⟩ ∣ (𝑤 ∈ dom 𝑦 ∧ ℎ = (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}))} ⊆ {⟨𝑤, ℎ⟩ ∣ 𝑤𝑦ℎ})
37		opabss 5177	. . . . . . 7 ⊢ {⟨𝑤, ℎ⟩ ∣ 𝑤𝑦ℎ} ⊆ 𝑦
38	36, 37	sstrdi 3950	. . . . . 6 ⊢ (∀𝑧 ∈ 𝒫 ran 𝑦(𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) → {⟨𝑤, ℎ⟩ ∣ (𝑤 ∈ dom 𝑦 ∧ ℎ = (𝑓‘{𝑢 ∣ 𝑤𝑦𝑢}))} ⊆ 𝑦)
39	9, 38	eqsstrid 3976	. . . . 5 ⊢ (∀𝑧 ∈ 𝒫 ran 𝑦(𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) → 𝐹 ⊆ 𝑦)
40	27, 7	fnmpti 6682	. . . . 5 ⊢ 𝐹 Fn dom 𝑦
41	1	ssex 5293	. . . . . . 7 ⊢ (𝐹 ⊆ 𝑦 → 𝐹 ∈ V)
42	41	adantr 486	. . . . . 6 ⊢ ((𝐹 ⊆ 𝑦 ∧ 𝐹 Fn dom 𝑦) → 𝐹 ∈ V)
43		sseq1 3963	. . . . . . . 8 ⊢ (𝑔 = 𝐹 → (𝑔 ⊆ 𝑦 ↔ 𝐹 ⊆ 𝑦))
44		fneq1 6630	. . . . . . . 8 ⊢ (𝑔 = 𝐹 → (𝑔 Fn dom 𝑦 ↔ 𝐹 Fn dom 𝑦))
45	43, 44	anbi12d 644	. . . . . . 7 ⊢ (𝑔 = 𝐹 → ((𝑔 ⊆ 𝑦 ∧ 𝑔 Fn dom 𝑦) ↔ (𝐹 ⊆ 𝑦 ∧ 𝐹 Fn dom 𝑦)))
46	45	spcegv 3558	. . . . . 6 ⊢ (𝐹 ∈ V → ((𝐹 ⊆ 𝑦 ∧ 𝐹 Fn dom 𝑦) → ∃𝑔(𝑔 ⊆ 𝑦 ∧ 𝑔 Fn dom 𝑦)))
47	42, 46	mpcom 39	. . . . 5 ⊢ ((𝐹 ⊆ 𝑦 ∧ 𝐹 Fn dom 𝑦) → ∃𝑔(𝑔 ⊆ 𝑦 ∧ 𝑔 Fn dom 𝑦))
48	39, 40, 47	sylancl 598	. . . 4 ⊢ (∀𝑧 ∈ 𝒫 ran 𝑦(𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) → ∃𝑔(𝑔 ⊆ 𝑦 ∧ 𝑔 Fn dom 𝑦))
49	48	exlimiv 1963	. . 3 ⊢ (∃𝑓∀𝑧 ∈ 𝒫 ran 𝑦(𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) → ∃𝑔(𝑔 ⊆ 𝑦 ∧ 𝑔 Fn dom 𝑦))
50	6, 49	syl 18	. 2 ⊢ (∀𝑥∃𝑓∀𝑧 ∈ 𝑥 (𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) → ∃𝑔(𝑔 ⊆ 𝑦 ∧ 𝑔 Fn dom 𝑦))
51		sseq1 3963	. . . 4 ⊢ (𝑔 = 𝑓 → (𝑔 ⊆ 𝑦 ↔ 𝑓 ⊆ 𝑦))
52		fneq1 6630	. . . 4 ⊢ (𝑔 = 𝑓 → (𝑔 Fn dom 𝑦 ↔ 𝑓 Fn dom 𝑦))
53	51, 52	anbi12d 644	. . 3 ⊢ (𝑔 = 𝑓 → ((𝑔 ⊆ 𝑦 ∧ 𝑔 Fn dom 𝑦) ↔ (𝑓 ⊆ 𝑦 ∧ 𝑓 Fn dom 𝑦)))
54	53	cbvexvw 2070	. 2 ⊢ (∃𝑔(𝑔 ⊆ 𝑦 ∧ 𝑔 Fn dom 𝑦) ↔ ∃𝑓(𝑓 ⊆ 𝑦 ∧ 𝑓 Fn dom 𝑦))
55	50, 54	sylib 221	1 ⊢ (∀𝑥∃𝑓∀𝑧 ∈ 𝑥 (𝑧 ≠ ∅ → (𝑓‘𝑧) ∈ 𝑧) → ∃𝑓(𝑓 ⊆ 𝑦 ∧ 𝑓 Fn dom 𝑦))

This proof depends on syntax axioms:   → wi 4   ∧ wa 401  ∀wal 1568   = wceq 1570  ∃wex 1812   ∈ wcel 2146  {cab 2743   ≠ wne 2960  ∀wral 3081  Vcvv 3457   ⊆ wss 3906  ∅c0 4286  𝒫 cpw 4564   class class class wbr 5111  {copab 5175   ↦ cmpt 5194  dom cdm 5663  ran crn 5664   Fn wfn 6535  ‘cfv 6540

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2737  ax-sep 5259  ax-nul 5271  ax-pow 5338  ax-pr 5406  ax-un 7738

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ne 2961  df-ral 3082  df-rex 3092  df-rab 3419  df-v 3459  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4287  df-if 4490  df-pw 4566  df-sn 4592  df-pr 4594  df-op 4598  df-uni 4875  df-br 5112  df-opab 5176  df-mpt 5195  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-rn 5674  df-iota 6496  df-fun 6542  df-fn 6543  df-fv 6548

This theorem is used by:  dfac3  10117