Theorem ttukeylem1 10617

Description: Lemma for ttukey 10626. Expand out the property of being an element of a property of finite character. (Contributed by Mario Carneiro, 15-May-2015.)

Hypotheses

Ref	Expression
ttukeylem.1	⊢ (𝜑 → 𝐹:(card‘(∪ 𝐴 ∖ 𝐵))⟶1-1onto(∪ 𝐴 ∖ 𝐵))
ttukeylem.2	⊢ (𝜑 → 𝐵 ∈ 𝐴)
ttukeylem.3	⊢ (𝜑 → ∀𝑥(𝑥 ∈ 𝐴 ↔ (𝒫 𝑥 ∩ Fin) ⊆ 𝐴))

Assertion

Ref	Expression
ttukeylem1	⊢ (𝜑 → (𝐶 ∈ 𝐴 ↔ (𝒫 𝐶 ∩ Fin) ⊆ 𝐴))

Distinct variable groups:   𝑥,𝐶   𝑥,𝐴   𝑥,𝐵   𝑥,𝐹

Allowed substitution hint:   𝜑(𝑥)

Proof of Theorem ttukeylem1

Step	Hyp	Ref	Expression
1		elex 3475	. . 3 ⊢ (𝐶 ∈ 𝐴 → 𝐶 ∈ V)
2	1	a1i 11	. 2 ⊢ (𝜑 → (𝐶 ∈ 𝐴 → 𝐶 ∈ V))
3		id 23	. . . . 5 ⊢ ((𝒫 𝐶 ∩ Fin) ⊆ 𝐴 → (𝒫 𝐶 ∩ Fin) ⊆ 𝐴)
4		ssun1 4179	. . . . . . . 8 ⊢ ∪ 𝐴 ⊆ (∪ 𝐴 ∪ 𝐵)
5		undif1 4433	. . . . . . . 8 ⊢ ((∪ 𝐴 ∖ 𝐵) ∪ 𝐵) = (∪ 𝐴 ∪ 𝐵)
6	4, 5	sseqtrri 3962	. . . . . . 7 ⊢ ∪ 𝐴 ⊆ ((∪ 𝐴 ∖ 𝐵) ∪ 𝐵)
7		fvex 6924	. . . . . . . . 9 ⊢ (card‘(∪ 𝐴 ∖ 𝐵)) ∈ V
8		ttukeylem.1	. . . . . . . . . 10 ⊢ (𝜑 → 𝐹:(card‘(∪ 𝐴 ∖ 𝐵))⟶1-1onto(∪ 𝐴 ∖ 𝐵))
9		f1ofo 6857	. . . . . . . . . 10 ⊢ (𝐹:(card‘(∪ 𝐴 ∖ 𝐵))⟶1-1onto(∪ 𝐴 ∖ 𝐵) → 𝐹:(card‘(∪ 𝐴 ∖ 𝐵))⟶onto(∪ 𝐴 ∖ 𝐵))
10	8, 9	syl 18	. . . . . . . . 9 ⊢ (𝜑 → 𝐹:(card‘(∪ 𝐴 ∖ 𝐵))⟶onto(∪ 𝐴 ∖ 𝐵))
11		focdmex 7995	. . . . . . . . 9 ⊢ ((card‘(∪ 𝐴 ∖ 𝐵)) ∈ V → (𝐹:(card‘(∪ 𝐴 ∖ 𝐵))⟶onto(∪ 𝐴 ∖ 𝐵) → (∪ 𝐴 ∖ 𝐵) ∈ V))
12	7, 10, 11	mpsyl 69	. . . . . . . 8 ⊢ (𝜑 → (∪ 𝐴 ∖ 𝐵) ∈ V)
13		ttukeylem.2	. . . . . . . 8 ⊢ (𝜑 → 𝐵 ∈ 𝐴)
14		unexg 7787	. . . . . . . 8 ⊢ (((∪ 𝐴 ∖ 𝐵) ∈ V ∧ 𝐵 ∈ 𝐴) → ((∪ 𝐴 ∖ 𝐵) ∪ 𝐵) ∈ V)
15	12, 13, 14	syl2anc 596	. . . . . . 7 ⊢ (𝜑 → ((∪ 𝐴 ∖ 𝐵) ∪ 𝐵) ∈ V)
16		ssexg 5286	. . . . . . 7 ⊢ ((∪ 𝐴 ⊆ ((∪ 𝐴 ∖ 𝐵) ∪ 𝐵) ∧ ((∪ 𝐴 ∖ 𝐵) ∪ 𝐵) ∈ V) → ∪ 𝐴 ∈ V)
17	6, 15, 16	sylancr 599	. . . . . 6 ⊢ (𝜑 → ∪ 𝐴 ∈ V)
18		uniexb 7805	. . . . . 6 ⊢ (𝐴 ∈ V ↔ ∪ 𝐴 ∈ V)
19	17, 18	sylibr 237	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ V)
20		ssexg 5286	. . . . 5 ⊢ (((𝒫 𝐶 ∩ Fin) ⊆ 𝐴 ∧ 𝐴 ∈ V) → (𝒫 𝐶 ∩ Fin) ∈ V)
21	3, 19, 20	syl2anr 609	. . . 4 ⊢ ((𝜑 ∧ (𝒫 𝐶 ∩ Fin) ⊆ 𝐴) → (𝒫 𝐶 ∩ Fin) ∈ V)
22		infpwfidom 10137	. . . 4 ⊢ ((𝒫 𝐶 ∩ Fin) ∈ V → 𝐶 ≼ (𝒫 𝐶 ∩ Fin))
23		reldom 9010	. . . . 5 ⊢ Rel ≼
24	23	brrelex1i 5712	. . . 4 ⊢ (𝐶 ≼ (𝒫 𝐶 ∩ Fin) → 𝐶 ∈ V)
25	21, 22, 24	3syl 19	. . 3 ⊢ ((𝜑 ∧ (𝒫 𝐶 ∩ Fin) ⊆ 𝐴) → 𝐶 ∈ V)
26	25	ex 418	. 2 ⊢ (𝜑 → ((𝒫 𝐶 ∩ Fin) ⊆ 𝐴 → 𝐶 ∈ V))
27		ttukeylem.3	. . 3 ⊢ (𝜑 → ∀𝑥(𝑥 ∈ 𝐴 ↔ (𝒫 𝑥 ∩ Fin) ⊆ 𝐴))
28		eleq1 2852	. . . . 5 ⊢ (𝑥 = 𝐶 → (𝑥 ∈ 𝐴 ↔ 𝐶 ∈ 𝐴))
29		pweq 4574	. . . . . . 7 ⊢ (𝑥 = 𝐶 → 𝒫 𝑥 = 𝒫 𝐶)
30	29	ineq1d 4119	. . . . . 6 ⊢ (𝑥 = 𝐶 → (𝒫 𝑥 ∩ Fin) = (𝒫 𝐶 ∩ Fin))
31	30	sseq1d 3944	. . . . 5 ⊢ (𝑥 = 𝐶 → ((𝒫 𝑥 ∩ Fin) ⊆ 𝐴 ↔ (𝒫 𝐶 ∩ Fin) ⊆ 𝐴))
32	28, 31	bibi12d 348	. . . 4 ⊢ (𝑥 = 𝐶 → ((𝑥 ∈ 𝐴 ↔ (𝒫 𝑥 ∩ Fin) ⊆ 𝐴) ↔ (𝐶 ∈ 𝐴 ↔ (𝒫 𝐶 ∩ Fin) ⊆ 𝐴)))
33	32	spcgv 3554	. . 3 ⊢ (𝐶 ∈ V → (∀𝑥(𝑥 ∈ 𝐴 ↔ (𝒫 𝑥 ∩ Fin) ⊆ 𝐴) → (𝐶 ∈ 𝐴 ↔ (𝒫 𝐶 ∩ Fin) ⊆ 𝐴)))
34	27, 33	syl5com 32	. 2 ⊢ (𝜑 → (𝐶 ∈ V → (𝐶 ∈ 𝐴 ↔ (𝒫 𝐶 ∩ Fin) ⊆ 𝐴)))
35	2, 26, 34	pm5.21ndd 382	1 ⊢ (𝜑 → (𝐶 ∈ 𝐴 ↔ (𝒫 𝐶 ∩ Fin) ⊆ 𝐴))

This proof depends on syntax axioms:   → wi 4   ↔ wb 209   ∧ wa 401  ∀wal 1568   = wceq 1570   ∈ wcel 2147  Vcvv 3454   ⊆ wss 3900   ∖ cdif 4048   ∩ cin 4092   ∪ cun 4152  𝒫 cpw 4560  ∪ cuni 4870   class class class wbr 5106  ⟶ontowfo 6559  ⟶1-1ontowf1o 6560  ‘cfv 6561   ≼ cdom 9002  Fincfn 9004  cardccrd 10046

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 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-rep 5236  ax-sep 5253  ax-nul 5264  ax-pow 5332  ax-pr 5396  ax-un 7778

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-reu 3370  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-pss 4017  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-iun 4956  df-br 5107  df-opab 5172  df-mpt 5191  df-tr 5217  df-id 5551  df-eprel 5556  df-po 5564  df-so 5565  df-fr 5609  df-we 5611  df-xp 5662  df-rel 5663  df-cnv 5664  df-co 5665  df-dm 5666  df-rn 5667  df-res 5668  df-ima 5669  df-ord 6386  df-on 6387  df-lim 6388  df-suc 6389  df-iota 6515  df-fun 6563  df-fn 6564  df-f 6565  df-f1 6566  df-fo 6567  df-f1o 6568  df-fv 6569  df-om 7905  df-1o 8507  df-en 9005  df-dom 9006  df-fin 9008

This theorem is used by:  ttukeylem2  10618  ttukeylem6  10622