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Theorem unblem2 8164
Description: Lemma for unbnn 8167. The value of the function 𝐹 belongs to the unbounded set of natural numbers 𝐴. (Contributed by NM, 3-Dec-2003.)
Hypothesis
Ref Expression
unblem.2 𝐹 = (rec((𝑥 ∈ V ↦ (𝐴 ∖ suc 𝑥)), 𝐴) ↾ ω)
Assertion
Ref Expression
unblem2 ((𝐴 ⊆ ω ∧ ∀𝑤 ∈ ω ∃𝑣𝐴 𝑤𝑣) → (𝑧 ∈ ω → (𝐹𝑧) ∈ 𝐴))
Distinct variable groups:   𝑤,𝑣,𝑥,𝑧,𝐴   𝑣,𝐹,𝑤,𝑧
Allowed substitution hint:   𝐹(𝑥)

Proof of Theorem unblem2
Dummy variables 𝑢 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 fveq2 6153 . . . 4 (𝑧 = ∅ → (𝐹𝑧) = (𝐹‘∅))
21eleq1d 2683 . . 3 (𝑧 = ∅ → ((𝐹𝑧) ∈ 𝐴 ↔ (𝐹‘∅) ∈ 𝐴))
3 fveq2 6153 . . . 4 (𝑧 = 𝑢 → (𝐹𝑧) = (𝐹𝑢))
43eleq1d 2683 . . 3 (𝑧 = 𝑢 → ((𝐹𝑧) ∈ 𝐴 ↔ (𝐹𝑢) ∈ 𝐴))
5 fveq2 6153 . . . 4 (𝑧 = suc 𝑢 → (𝐹𝑧) = (𝐹‘suc 𝑢))
65eleq1d 2683 . . 3 (𝑧 = suc 𝑢 → ((𝐹𝑧) ∈ 𝐴 ↔ (𝐹‘suc 𝑢) ∈ 𝐴))
7 omsson 7023 . . . . . 6 ω ⊆ On
8 sstr 3595 . . . . . 6 ((𝐴 ⊆ ω ∧ ω ⊆ On) → 𝐴 ⊆ On)
97, 8mpan2 706 . . . . 5 (𝐴 ⊆ ω → 𝐴 ⊆ On)
10 peano1 7039 . . . . . . . . 9 ∅ ∈ ω
11 eleq1 2686 . . . . . . . . . . 11 (𝑤 = ∅ → (𝑤𝑣 ↔ ∅ ∈ 𝑣))
1211rexbidv 3046 . . . . . . . . . 10 (𝑤 = ∅ → (∃𝑣𝐴 𝑤𝑣 ↔ ∃𝑣𝐴 ∅ ∈ 𝑣))
1312rspcv 3294 . . . . . . . . 9 (∅ ∈ ω → (∀𝑤 ∈ ω ∃𝑣𝐴 𝑤𝑣 → ∃𝑣𝐴 ∅ ∈ 𝑣))
1410, 13ax-mp 5 . . . . . . . 8 (∀𝑤 ∈ ω ∃𝑣𝐴 𝑤𝑣 → ∃𝑣𝐴 ∅ ∈ 𝑣)
15 df-rex 2913 . . . . . . . 8 (∃𝑣𝐴 ∅ ∈ 𝑣 ↔ ∃𝑣(𝑣𝐴 ∧ ∅ ∈ 𝑣))
1614, 15sylib 208 . . . . . . 7 (∀𝑤 ∈ ω ∃𝑣𝐴 𝑤𝑣 → ∃𝑣(𝑣𝐴 ∧ ∅ ∈ 𝑣))
17 exsimpl 1792 . . . . . . 7 (∃𝑣(𝑣𝐴 ∧ ∅ ∈ 𝑣) → ∃𝑣 𝑣𝐴)
1816, 17syl 17 . . . . . 6 (∀𝑤 ∈ ω ∃𝑣𝐴 𝑤𝑣 → ∃𝑣 𝑣𝐴)
19 n0 3912 . . . . . 6 (𝐴 ≠ ∅ ↔ ∃𝑣 𝑣𝐴)
2018, 19sylibr 224 . . . . 5 (∀𝑤 ∈ ω ∃𝑣𝐴 𝑤𝑣𝐴 ≠ ∅)
21 onint 6949 . . . . 5 ((𝐴 ⊆ On ∧ 𝐴 ≠ ∅) → 𝐴𝐴)
229, 20, 21syl2an 494 . . . 4 ((𝐴 ⊆ ω ∧ ∀𝑤 ∈ ω ∃𝑣𝐴 𝑤𝑣) → 𝐴𝐴)
23 unblem.2 . . . . . . . 8 𝐹 = (rec((𝑥 ∈ V ↦ (𝐴 ∖ suc 𝑥)), 𝐴) ↾ ω)
2423fveq1i 6154 . . . . . . 7 (𝐹‘∅) = ((rec((𝑥 ∈ V ↦ (𝐴 ∖ suc 𝑥)), 𝐴) ↾ ω)‘∅)
25 fr0g 7483 . . . . . . 7 ( 𝐴𝐴 → ((rec((𝑥 ∈ V ↦ (𝐴 ∖ suc 𝑥)), 𝐴) ↾ ω)‘∅) = 𝐴)
2624, 25syl5req 2668 . . . . . 6 ( 𝐴𝐴 𝐴 = (𝐹‘∅))
2726eleq1d 2683 . . . . 5 ( 𝐴𝐴 → ( 𝐴𝐴 ↔ (𝐹‘∅) ∈ 𝐴))
2827ibi 256 . . . 4 ( 𝐴𝐴 → (𝐹‘∅) ∈ 𝐴)
2922, 28syl 17 . . 3 ((𝐴 ⊆ ω ∧ ∀𝑤 ∈ ω ∃𝑣𝐴 𝑤𝑣) → (𝐹‘∅) ∈ 𝐴)
30 unblem1 8163 . . . . 5 (((𝐴 ⊆ ω ∧ ∀𝑤 ∈ ω ∃𝑣𝐴 𝑤𝑣) ∧ (𝐹𝑢) ∈ 𝐴) → (𝐴 ∖ suc (𝐹𝑢)) ∈ 𝐴)
31 suceq 5754 . . . . . . . . . . . 12 (𝑦 = 𝑥 → suc 𝑦 = suc 𝑥)
3231difeq2d 3711 . . . . . . . . . . 11 (𝑦 = 𝑥 → (𝐴 ∖ suc 𝑦) = (𝐴 ∖ suc 𝑥))
3332inteqd 4450 . . . . . . . . . 10 (𝑦 = 𝑥 (𝐴 ∖ suc 𝑦) = (𝐴 ∖ suc 𝑥))
34 suceq 5754 . . . . . . . . . . . 12 (𝑦 = (𝐹𝑢) → suc 𝑦 = suc (𝐹𝑢))
3534difeq2d 3711 . . . . . . . . . . 11 (𝑦 = (𝐹𝑢) → (𝐴 ∖ suc 𝑦) = (𝐴 ∖ suc (𝐹𝑢)))
3635inteqd 4450 . . . . . . . . . 10 (𝑦 = (𝐹𝑢) → (𝐴 ∖ suc 𝑦) = (𝐴 ∖ suc (𝐹𝑢)))
3723, 33, 36frsucmpt2 7487 . . . . . . . . 9 ((𝑢 ∈ ω ∧ (𝐴 ∖ suc (𝐹𝑢)) ∈ 𝐴) → (𝐹‘suc 𝑢) = (𝐴 ∖ suc (𝐹𝑢)))
3837eqcomd 2627 . . . . . . . 8 ((𝑢 ∈ ω ∧ (𝐴 ∖ suc (𝐹𝑢)) ∈ 𝐴) → (𝐴 ∖ suc (𝐹𝑢)) = (𝐹‘suc 𝑢))
3938eleq1d 2683 . . . . . . 7 ((𝑢 ∈ ω ∧ (𝐴 ∖ suc (𝐹𝑢)) ∈ 𝐴) → ( (𝐴 ∖ suc (𝐹𝑢)) ∈ 𝐴 ↔ (𝐹‘suc 𝑢) ∈ 𝐴))
4039ex 450 . . . . . 6 (𝑢 ∈ ω → ( (𝐴 ∖ suc (𝐹𝑢)) ∈ 𝐴 → ( (𝐴 ∖ suc (𝐹𝑢)) ∈ 𝐴 ↔ (𝐹‘suc 𝑢) ∈ 𝐴)))
4140ibd 258 . . . . 5 (𝑢 ∈ ω → ( (𝐴 ∖ suc (𝐹𝑢)) ∈ 𝐴 → (𝐹‘suc 𝑢) ∈ 𝐴))
4230, 41syl5 34 . . . 4 (𝑢 ∈ ω → (((𝐴 ⊆ ω ∧ ∀𝑤 ∈ ω ∃𝑣𝐴 𝑤𝑣) ∧ (𝐹𝑢) ∈ 𝐴) → (𝐹‘suc 𝑢) ∈ 𝐴))
4342expd 452 . . 3 (𝑢 ∈ ω → ((𝐴 ⊆ ω ∧ ∀𝑤 ∈ ω ∃𝑣𝐴 𝑤𝑣) → ((𝐹𝑢) ∈ 𝐴 → (𝐹‘suc 𝑢) ∈ 𝐴)))
442, 4, 6, 29, 43finds2 7048 . 2 (𝑧 ∈ ω → ((𝐴 ⊆ ω ∧ ∀𝑤 ∈ ω ∃𝑣𝐴 𝑤𝑣) → (𝐹𝑧) ∈ 𝐴))
4544com12 32 1 ((𝐴 ⊆ ω ∧ ∀𝑤 ∈ ω ∃𝑣𝐴 𝑤𝑣) → (𝑧 ∈ ω → (𝐹𝑧) ∈ 𝐴))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 384   = wceq 1480  wex 1701  wcel 1987  wne 2790  wral 2907  wrex 2908  Vcvv 3189  cdif 3556  wss 3559  c0 3896   cint 4445  cmpt 4678  cres 5081  Oncon0 5687  suc csuc 5689  cfv 5852  ωcom 7019  reccrdg 7457
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-sep 4746  ax-nul 4754  ax-pow 4808  ax-pr 4872  ax-un 6909
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-ral 2912  df-rex 2913  df-reu 2914  df-rab 2916  df-v 3191  df-sbc 3422  df-csb 3519  df-dif 3562  df-un 3564  df-in 3566  df-ss 3573  df-pss 3575  df-nul 3897  df-if 4064  df-pw 4137  df-sn 4154  df-pr 4156  df-tp 4158  df-op 4160  df-uni 4408  df-int 4446  df-iun 4492  df-br 4619  df-opab 4679  df-mpt 4680  df-tr 4718  df-eprel 4990  df-id 4994  df-po 5000  df-so 5001  df-fr 5038  df-we 5040  df-xp 5085  df-rel 5086  df-cnv 5087  df-co 5088  df-dm 5089  df-rn 5090  df-res 5091  df-ima 5092  df-pred 5644  df-ord 5690  df-on 5691  df-lim 5692  df-suc 5693  df-iota 5815  df-fun 5854  df-fn 5855  df-f 5856  df-f1 5857  df-fo 5858  df-f1o 5859  df-fv 5860  df-om 7020  df-wrecs 7359  df-recs 7420  df-rdg 7458
This theorem is referenced by:  unblem3  8165  unblem4  8166
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