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Theorem inf3lemd 9074
Description: Lemma for our Axiom of Infinity => standard Axiom of Infinity. See inf3 9082 for detailed description. (Contributed by NM, 28-Oct-1996.)
Hypotheses
Ref Expression
inf3lem.1 𝐺 = (𝑦 ∈ V ↦ {𝑤𝑥 ∣ (𝑤𝑥) ⊆ 𝑦})
inf3lem.2 𝐹 = (rec(𝐺, ∅) ↾ ω)
inf3lem.3 𝐴 ∈ V
inf3lem.4 𝐵 ∈ V
Assertion
Ref Expression
inf3lemd (𝐴 ∈ ω → (𝐹𝐴) ⊆ 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.
StepHypRef Expression
1 fveq2 6645 . . . . 5 (𝐴 = ∅ → (𝐹𝐴) = (𝐹‘∅))
2 inf3lem.1 . . . . . 6 𝐺 = (𝑦 ∈ V ↦ {𝑤𝑥 ∣ (𝑤𝑥) ⊆ 𝑦})
3 inf3lem.2 . . . . . 6 𝐹 = (rec(𝐺, ∅) ↾ ω)
4 inf3lem.3 . . . . . 6 𝐴 ∈ V
5 inf3lem.4 . . . . . 6 𝐵 ∈ V
62, 3, 4, 5inf3lemb 9072 . . . . 5 (𝐹‘∅) = ∅
71, 6eqtrdi 2849 . . . 4 (𝐴 = ∅ → (𝐹𝐴) = ∅)
8 0ss 4304 . . . 4 ∅ ⊆ 𝑥
97, 8eqsstrdi 3969 . . 3 (𝐴 = ∅ → (𝐹𝐴) ⊆ 𝑥)
109a1d 25 . 2 (𝐴 = ∅ → (𝐴 ∈ ω → (𝐹𝐴) ⊆ 𝑥))
11 nnsuc 7577 . . . 4 ((𝐴 ∈ ω ∧ 𝐴 ≠ ∅) → ∃𝑣 ∈ ω 𝐴 = suc 𝑣)
12 vex 3444 . . . . . . . . . 10 𝑣 ∈ V
132, 3, 12, 5inf3lemc 9073 . . . . . . . . 9 (𝑣 ∈ ω → (𝐹‘suc 𝑣) = (𝐺‘(𝐹𝑣)))
1413eleq2d 2875 . . . . . . . 8 (𝑣 ∈ ω → (𝑢 ∈ (𝐹‘suc 𝑣) ↔ 𝑢 ∈ (𝐺‘(𝐹𝑣))))
15 vex 3444 . . . . . . . . . 10 𝑢 ∈ V
16 fvex 6658 . . . . . . . . . 10 (𝐹𝑣) ∈ V
172, 3, 15, 16inf3lema 9071 . . . . . . . . 9 (𝑢 ∈ (𝐺‘(𝐹𝑣)) ↔ (𝑢𝑥 ∧ (𝑢𝑥) ⊆ (𝐹𝑣)))
1817simplbi 501 . . . . . . . 8 (𝑢 ∈ (𝐺‘(𝐹𝑣)) → 𝑢𝑥)
1914, 18syl6bi 256 . . . . . . 7 (𝑣 ∈ ω → (𝑢 ∈ (𝐹‘suc 𝑣) → 𝑢𝑥))
2019ssrdv 3921 . . . . . 6 (𝑣 ∈ ω → (𝐹‘suc 𝑣) ⊆ 𝑥)
21 fveq2 6645 . . . . . . 7 (𝐴 = suc 𝑣 → (𝐹𝐴) = (𝐹‘suc 𝑣))
2221sseq1d 3946 . . . . . 6 (𝐴 = suc 𝑣 → ((𝐹𝐴) ⊆ 𝑥 ↔ (𝐹‘suc 𝑣) ⊆ 𝑥))
2320, 22syl5ibrcom 250 . . . . 5 (𝑣 ∈ ω → (𝐴 = suc 𝑣 → (𝐹𝐴) ⊆ 𝑥))
2423rexlimiv 3239 . . . 4 (∃𝑣 ∈ ω 𝐴 = suc 𝑣 → (𝐹𝐴) ⊆ 𝑥)
2511, 24syl 17 . . 3 ((𝐴 ∈ ω ∧ 𝐴 ≠ ∅) → (𝐹𝐴) ⊆ 𝑥)
2625expcom 417 . 2 (𝐴 ≠ ∅ → (𝐴 ∈ ω → (𝐹𝐴) ⊆ 𝑥))
2710, 26pm2.61ine 3070 1 (𝐴 ∈ ω → (𝐹𝐴) ⊆ 𝑥)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 399   = wceq 1538  wcel 2111  wne 2987  wrex 3107  {crab 3110  Vcvv 3441  cin 3880  wss 3881  c0 4243  cmpt 5110  cres 5521  suc csuc 6161  cfv 6324  ωcom 7560  reccrdg 8028
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-sep 5167  ax-nul 5174  ax-pow 5231  ax-pr 5295  ax-un 7441
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ne 2988  df-ral 3111  df-rex 3112  df-reu 3113  df-rab 3115  df-v 3443  df-sbc 3721  df-csb 3829  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-pss 3900  df-nul 4244  df-if 4426  df-pw 4499  df-sn 4526  df-pr 4528  df-tp 4530  df-op 4532  df-uni 4801  df-iun 4883  df-br 5031  df-opab 5093  df-mpt 5111  df-tr 5137  df-id 5425  df-eprel 5430  df-po 5438  df-so 5439  df-fr 5478  df-we 5480  df-xp 5525  df-rel 5526  df-cnv 5527  df-co 5528  df-dm 5529  df-rn 5530  df-res 5531  df-ima 5532  df-pred 6116  df-ord 6162  df-on 6163  df-lim 6164  df-suc 6165  df-iota 6283  df-fun 6326  df-fn 6327  df-f 6328  df-f1 6329  df-fo 6330  df-f1o 6331  df-fv 6332  df-om 7561  df-wrecs 7930  df-recs 7991  df-rdg 8029
This theorem is referenced by:  inf3lem2  9076  inf3lem3  9077  inf3lem6  9080
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