Theorem inf3lemd 9092

Description: Lemma for our Axiom of Infinity => standard Axiom of Infinity. See inf3 9100 for detailed description. (Contributed by NM, 28-Oct-1996.)

Hypotheses

Ref	Expression
inf3lem.1	⊢ 𝐺 = (𝑦 ∈ V ↦ {𝑤 ∈ 𝑥 ∣ (𝑤 ∩ 𝑥) ⊆ 𝑦})
inf3lem.2	⊢ 𝐹 = (rec(𝐺, ∅) ↾ ω)
inf3lem.3	⊢ 𝐴 ∈ V
inf3lem.4	⊢ 𝐵 ∈ V

Assertion

Ref	Expression
inf3lemd	⊢ (𝐴 ∈ ω → (𝐹‘𝐴) ⊆ 𝑥)

Distinct variable group:   𝑥,𝑦,𝑤

Allowed substitution hints:   𝐴(𝑥,𝑦,𝑤)   𝐵(𝑥,𝑦,𝑤)   𝐹(𝑥,𝑦,𝑤)   𝐺(𝑥,𝑦,𝑤)

Proof of Theorem inf3lemd

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

Step	Hyp	Ref	Expression
1		fveq2 6672	. . . . 5 ⊢ (𝐴 = ∅ → (𝐹‘𝐴) = (𝐹‘∅))
2		inf3lem.1	. . . . . 6 ⊢ 𝐺 = (𝑦 ∈ V ↦ {𝑤 ∈ 𝑥 ∣ (𝑤 ∩ 𝑥) ⊆ 𝑦})
3		inf3lem.2	. . . . . 6 ⊢ 𝐹 = (rec(𝐺, ∅) ↾ ω)
4		inf3lem.3	. . . . . 6 ⊢ 𝐴 ∈ V
5		inf3lem.4	. . . . . 6 ⊢ 𝐵 ∈ V
6	2, 3, 4, 5	inf3lemb 9090	. . . . 5 ⊢ (𝐹‘∅) = ∅
7	1, 6	syl6eq 2874	. . . 4 ⊢ (𝐴 = ∅ → (𝐹‘𝐴) = ∅)
8		0ss 4352	. . . 4 ⊢ ∅ ⊆ 𝑥
9	7, 8	eqsstrdi 4023	. . 3 ⊢ (𝐴 = ∅ → (𝐹‘𝐴) ⊆ 𝑥)
10	9	a1d 25	. 2 ⊢ (𝐴 = ∅ → (𝐴 ∈ ω → (𝐹‘𝐴) ⊆ 𝑥))
11		nnsuc 7599	. . . 4 ⊢ ((𝐴 ∈ ω ∧ 𝐴 ≠ ∅) → ∃𝑣 ∈ ω 𝐴 = suc 𝑣)
12		vex 3499	. . . . . . . . . 10 ⊢ 𝑣 ∈ V
13	2, 3, 12, 5	inf3lemc 9091	. . . . . . . . 9 ⊢ (𝑣 ∈ ω → (𝐹‘suc 𝑣) = (𝐺‘(𝐹‘𝑣)))
14	13	eleq2d 2900	. . . . . . . 8 ⊢ (𝑣 ∈ ω → (𝑢 ∈ (𝐹‘suc 𝑣) ↔ 𝑢 ∈ (𝐺‘(𝐹‘𝑣))))
15		vex 3499	. . . . . . . . . 10 ⊢ 𝑢 ∈ V
16		fvex 6685	. . . . . . . . . 10 ⊢ (𝐹‘𝑣) ∈ V
17	2, 3, 15, 16	inf3lema 9089	. . . . . . . . 9 ⊢ (𝑢 ∈ (𝐺‘(𝐹‘𝑣)) ↔ (𝑢 ∈ 𝑥 ∧ (𝑢 ∩ 𝑥) ⊆ (𝐹‘𝑣)))
18	17	simplbi 500	. . . . . . . 8 ⊢ (𝑢 ∈ (𝐺‘(𝐹‘𝑣)) → 𝑢 ∈ 𝑥)
19	14, 18	syl6bi 255	. . . . . . 7 ⊢ (𝑣 ∈ ω → (𝑢 ∈ (𝐹‘suc 𝑣) → 𝑢 ∈ 𝑥))
20	19	ssrdv 3975	. . . . . 6 ⊢ (𝑣 ∈ ω → (𝐹‘suc 𝑣) ⊆ 𝑥)
21		fveq2 6672	. . . . . . 7 ⊢ (𝐴 = suc 𝑣 → (𝐹‘𝐴) = (𝐹‘suc 𝑣))
22	21	sseq1d 4000	. . . . . 6 ⊢ (𝐴 = suc 𝑣 → ((𝐹‘𝐴) ⊆ 𝑥 ↔ (𝐹‘suc 𝑣) ⊆ 𝑥))
23	20, 22	syl5ibrcom 249	. . . . 5 ⊢ (𝑣 ∈ ω → (𝐴 = suc 𝑣 → (𝐹‘𝐴) ⊆ 𝑥))
24	23	rexlimiv 3282	. . . 4 ⊢ (∃𝑣 ∈ ω 𝐴 = suc 𝑣 → (𝐹‘𝐴) ⊆ 𝑥)
25	11, 24	syl 17	. . 3 ⊢ ((𝐴 ∈ ω ∧ 𝐴 ≠ ∅) → (𝐹‘𝐴) ⊆ 𝑥)
26	25	expcom 416	. 2 ⊢ (𝐴 ≠ ∅ → (𝐴 ∈ ω → (𝐹‘𝐴) ⊆ 𝑥))
27	10, 26	pm2.61ine 3102	1 ⊢ (𝐴 ∈ ω → (𝐹‘𝐴) ⊆ 𝑥)

Syntax hints:   → wi 4   ∧ wa 398   = wceq 1537   ∈ wcel 2114   ≠ wne 3018  ∃wrex 3141  {crab 3144  Vcvv 3496   ∩ cin 3937   ⊆ wss 3938  ∅c0 4293   ↦ cmpt 5148   ↾ cres 5559  suc csuc 6195  ‘cfv 6357  ωcom 7582  reccrdg 8047

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 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-sep 5205  ax-nul 5212  ax-pow 5268  ax-pr 5332  ax-un 7463

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ne 3019  df-ral 3145  df-rex 3146  df-reu 3147  df-rab 3149  df-v 3498  df-sbc 3775  df-csb 3886  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-pss 3956  df-nul 4294  df-if 4470  df-pw 4543  df-sn 4570  df-pr 4572  df-tp 4574  df-op 4576  df-uni 4841  df-iun 4923  df-br 5069  df-opab 5131  df-mpt 5149  df-tr 5175  df-id 5462  df-eprel 5467  df-po 5476  df-so 5477  df-fr 5516  df-we 5518  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-dm 5567  df-rn 5568  df-res 5569  df-ima 5570  df-pred 6150  df-ord 6196  df-on 6197  df-lim 6198  df-suc 6199  df-iota 6316  df-fun 6359  df-fn 6360  df-f 6361  df-f1 6362  df-fo 6363  df-f1o 6364  df-fv 6365  df-om 7583  df-wrecs 7949  df-recs 8010  df-rdg 8048

This theorem is referenced by:  inf3lem2  9094  inf3lem3  9095  inf3lem6  9098