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Theorem axdclem2 9980
 Description: Lemma for axdc 9981. Using the full Axiom of Choice, we can construct a choice function 𝑔 on 𝒫 dom 𝑥. From this, we can build a sequence 𝐹 starting at any value 𝑠 ∈ dom 𝑥 by repeatedly applying 𝑔 to the set (𝐹‘𝑥) (where 𝑥 is the value from the previous iteration). (Contributed by Mario Carneiro, 25-Jan-2013.)
Hypothesis
Ref Expression
axdclem2.1 𝐹 = (rec((𝑦 ∈ V ↦ (𝑔‘{𝑧𝑦𝑥𝑧})), 𝑠) ↾ ω)
Assertion
Ref Expression
axdclem2 (∃𝑧 𝑠𝑥𝑧 → (ran 𝑥 ⊆ dom 𝑥 → ∃𝑓𝑛 ∈ ω (𝑓𝑛)𝑥(𝑓‘suc 𝑛)))
Distinct variable groups:   𝑓,𝐹,𝑛   𝑦,𝐹,𝑧,𝑛   𝑓,𝑔,𝑥,𝑛   𝑔,𝑠,𝑦,𝑛   𝑧,𝑔   𝑥,𝑦,𝑧
Allowed substitution hints:   𝐹(𝑥,𝑔,𝑠)

Proof of Theorem axdclem2
Dummy variable 𝑘 is distinct from all other variables.
StepHypRef Expression
1 frfnom 8080 . . . . . . 7 (rec((𝑦 ∈ V ↦ (𝑔‘{𝑧𝑦𝑥𝑧})), 𝑠) ↾ ω) Fn ω
2 axdclem2.1 . . . . . . . 8 𝐹 = (rec((𝑦 ∈ V ↦ (𝑔‘{𝑧𝑦𝑥𝑧})), 𝑠) ↾ ω)
32fneq1i 6431 . . . . . . 7 (𝐹 Fn ω ↔ (rec((𝑦 ∈ V ↦ (𝑔‘{𝑧𝑦𝑥𝑧})), 𝑠) ↾ ω) Fn ω)
41, 3mpbir 234 . . . . . 6 𝐹 Fn ω
54a1i 11 . . . . 5 ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ∃𝑧 𝑠𝑥𝑧 ∧ ran 𝑥 ⊆ dom 𝑥) → 𝐹 Fn ω)
6 omex 9139 . . . . . 6 ω ∈ V
76a1i 11 . . . . 5 ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ∃𝑧 𝑠𝑥𝑧 ∧ ran 𝑥 ⊆ dom 𝑥) → ω ∈ V)
85, 7fnexd 6972 . . . 4 ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ∃𝑧 𝑠𝑥𝑧 ∧ ran 𝑥 ⊆ dom 𝑥) → 𝐹 ∈ V)
9 fveq2 6658 . . . . . . . 8 (𝑛 = ∅ → (𝐹𝑛) = (𝐹‘∅))
10 suceq 6234 . . . . . . . . 9 (𝑛 = ∅ → suc 𝑛 = suc ∅)
1110fveq2d 6662 . . . . . . . 8 (𝑛 = ∅ → (𝐹‘suc 𝑛) = (𝐹‘suc ∅))
129, 11breq12d 5045 . . . . . . 7 (𝑛 = ∅ → ((𝐹𝑛)𝑥(𝐹‘suc 𝑛) ↔ (𝐹‘∅)𝑥(𝐹‘suc ∅)))
13 fveq2 6658 . . . . . . . 8 (𝑛 = 𝑘 → (𝐹𝑛) = (𝐹𝑘))
14 suceq 6234 . . . . . . . . 9 (𝑛 = 𝑘 → suc 𝑛 = suc 𝑘)
1514fveq2d 6662 . . . . . . . 8 (𝑛 = 𝑘 → (𝐹‘suc 𝑛) = (𝐹‘suc 𝑘))
1613, 15breq12d 5045 . . . . . . 7 (𝑛 = 𝑘 → ((𝐹𝑛)𝑥(𝐹‘suc 𝑛) ↔ (𝐹𝑘)𝑥(𝐹‘suc 𝑘)))
17 fveq2 6658 . . . . . . . 8 (𝑛 = suc 𝑘 → (𝐹𝑛) = (𝐹‘suc 𝑘))
18 suceq 6234 . . . . . . . . 9 (𝑛 = suc 𝑘 → suc 𝑛 = suc suc 𝑘)
1918fveq2d 6662 . . . . . . . 8 (𝑛 = suc 𝑘 → (𝐹‘suc 𝑛) = (𝐹‘suc suc 𝑘))
2017, 19breq12d 5045 . . . . . . 7 (𝑛 = suc 𝑘 → ((𝐹𝑛)𝑥(𝐹‘suc 𝑛) ↔ (𝐹‘suc 𝑘)𝑥(𝐹‘suc suc 𝑘)))
212fveq1i 6659 . . . . . . . . . . . . 13 (𝐹‘∅) = ((rec((𝑦 ∈ V ↦ (𝑔‘{𝑧𝑦𝑥𝑧})), 𝑠) ↾ ω)‘∅)
22 fr0g 8081 . . . . . . . . . . . . . 14 (𝑠 ∈ V → ((rec((𝑦 ∈ V ↦ (𝑔‘{𝑧𝑦𝑥𝑧})), 𝑠) ↾ ω)‘∅) = 𝑠)
2322elv 3415 . . . . . . . . . . . . 13 ((rec((𝑦 ∈ V ↦ (𝑔‘{𝑧𝑦𝑥𝑧})), 𝑠) ↾ ω)‘∅) = 𝑠
2421, 23eqtri 2781 . . . . . . . . . . . 12 (𝐹‘∅) = 𝑠
2524breq1i 5039 . . . . . . . . . . 11 ((𝐹‘∅)𝑥𝑧𝑠𝑥𝑧)
2625biimpri 231 . . . . . . . . . 10 (𝑠𝑥𝑧 → (𝐹‘∅)𝑥𝑧)
2726eximi 1836 . . . . . . . . 9 (∃𝑧 𝑠𝑥𝑧 → ∃𝑧(𝐹‘∅)𝑥𝑧)
28 peano1 7600 . . . . . . . . . 10 ∅ ∈ ω
292axdclem 9979 . . . . . . . . . 10 ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ran 𝑥 ⊆ dom 𝑥 ∧ ∃𝑧(𝐹‘∅)𝑥𝑧) → (∅ ∈ ω → (𝐹‘∅)𝑥(𝐹‘suc ∅)))
3028, 29mpi 20 . . . . . . . . 9 ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ran 𝑥 ⊆ dom 𝑥 ∧ ∃𝑧(𝐹‘∅)𝑥𝑧) → (𝐹‘∅)𝑥(𝐹‘suc ∅))
3127, 30syl3an3 1162 . . . . . . . 8 ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ran 𝑥 ⊆ dom 𝑥 ∧ ∃𝑧 𝑠𝑥𝑧) → (𝐹‘∅)𝑥(𝐹‘suc ∅))
32313com23 1123 . . . . . . 7 ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ∃𝑧 𝑠𝑥𝑧 ∧ ran 𝑥 ⊆ dom 𝑥) → (𝐹‘∅)𝑥(𝐹‘suc ∅))
33 fvex 6671 . . . . . . . . . . . . . 14 (𝐹𝑘) ∈ V
34 fvex 6671 . . . . . . . . . . . . . 14 (𝐹‘suc 𝑘) ∈ V
3533, 34brelrn 5783 . . . . . . . . . . . . 13 ((𝐹𝑘)𝑥(𝐹‘suc 𝑘) → (𝐹‘suc 𝑘) ∈ ran 𝑥)
36 ssel 3885 . . . . . . . . . . . . 13 (ran 𝑥 ⊆ dom 𝑥 → ((𝐹‘suc 𝑘) ∈ ran 𝑥 → (𝐹‘suc 𝑘) ∈ dom 𝑥))
3735, 36syl5 34 . . . . . . . . . . . 12 (ran 𝑥 ⊆ dom 𝑥 → ((𝐹𝑘)𝑥(𝐹‘suc 𝑘) → (𝐹‘suc 𝑘) ∈ dom 𝑥))
3834eldm 5740 . . . . . . . . . . . 12 ((𝐹‘suc 𝑘) ∈ dom 𝑥 ↔ ∃𝑧(𝐹‘suc 𝑘)𝑥𝑧)
3937, 38syl6ib 254 . . . . . . . . . . 11 (ran 𝑥 ⊆ dom 𝑥 → ((𝐹𝑘)𝑥(𝐹‘suc 𝑘) → ∃𝑧(𝐹‘suc 𝑘)𝑥𝑧))
4039ad2antll 728 . . . . . . . . . 10 ((𝑘 ∈ ω ∧ (∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ran 𝑥 ⊆ dom 𝑥)) → ((𝐹𝑘)𝑥(𝐹‘suc 𝑘) → ∃𝑧(𝐹‘suc 𝑘)𝑥𝑧))
41 peano2 7601 . . . . . . . . . . . . . 14 (𝑘 ∈ ω → suc 𝑘 ∈ ω)
422axdclem 9979 . . . . . . . . . . . . . 14 ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ran 𝑥 ⊆ dom 𝑥 ∧ ∃𝑧(𝐹‘suc 𝑘)𝑥𝑧) → (suc 𝑘 ∈ ω → (𝐹‘suc 𝑘)𝑥(𝐹‘suc suc 𝑘)))
4341, 42syl5 34 . . . . . . . . . . . . 13 ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ran 𝑥 ⊆ dom 𝑥 ∧ ∃𝑧(𝐹‘suc 𝑘)𝑥𝑧) → (𝑘 ∈ ω → (𝐹‘suc 𝑘)𝑥(𝐹‘suc suc 𝑘)))
44433expia 1118 . . . . . . . . . . . 12 ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ran 𝑥 ⊆ dom 𝑥) → (∃𝑧(𝐹‘suc 𝑘)𝑥𝑧 → (𝑘 ∈ ω → (𝐹‘suc 𝑘)𝑥(𝐹‘suc suc 𝑘))))
4544com3r 87 . . . . . . . . . . 11 (𝑘 ∈ ω → ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ran 𝑥 ⊆ dom 𝑥) → (∃𝑧(𝐹‘suc 𝑘)𝑥𝑧 → (𝐹‘suc 𝑘)𝑥(𝐹‘suc suc 𝑘))))
4645imp 410 . . . . . . . . . 10 ((𝑘 ∈ ω ∧ (∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ran 𝑥 ⊆ dom 𝑥)) → (∃𝑧(𝐹‘suc 𝑘)𝑥𝑧 → (𝐹‘suc 𝑘)𝑥(𝐹‘suc suc 𝑘)))
4740, 46syld 47 . . . . . . . . 9 ((𝑘 ∈ ω ∧ (∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ran 𝑥 ⊆ dom 𝑥)) → ((𝐹𝑘)𝑥(𝐹‘suc 𝑘) → (𝐹‘suc 𝑘)𝑥(𝐹‘suc suc 𝑘)))
48473adantr2 1167 . . . . . . . 8 ((𝑘 ∈ ω ∧ (∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ∃𝑧 𝑠𝑥𝑧 ∧ ran 𝑥 ⊆ dom 𝑥)) → ((𝐹𝑘)𝑥(𝐹‘suc 𝑘) → (𝐹‘suc 𝑘)𝑥(𝐹‘suc suc 𝑘)))
4948ex 416 . . . . . . 7 (𝑘 ∈ ω → ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ∃𝑧 𝑠𝑥𝑧 ∧ ran 𝑥 ⊆ dom 𝑥) → ((𝐹𝑘)𝑥(𝐹‘suc 𝑘) → (𝐹‘suc 𝑘)𝑥(𝐹‘suc suc 𝑘))))
5012, 16, 20, 32, 49finds2 7610 . . . . . 6 (𝑛 ∈ ω → ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ∃𝑧 𝑠𝑥𝑧 ∧ ran 𝑥 ⊆ dom 𝑥) → (𝐹𝑛)𝑥(𝐹‘suc 𝑛)))
5150com12 32 . . . . 5 ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ∃𝑧 𝑠𝑥𝑧 ∧ ran 𝑥 ⊆ dom 𝑥) → (𝑛 ∈ ω → (𝐹𝑛)𝑥(𝐹‘suc 𝑛)))
5251ralrimiv 3112 . . . 4 ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ∃𝑧 𝑠𝑥𝑧 ∧ ran 𝑥 ⊆ dom 𝑥) → ∀𝑛 ∈ ω (𝐹𝑛)𝑥(𝐹‘suc 𝑛))
53 fveq1 6657 . . . . . 6 (𝑓 = 𝐹 → (𝑓𝑛) = (𝐹𝑛))
54 fveq1 6657 . . . . . 6 (𝑓 = 𝐹 → (𝑓‘suc 𝑛) = (𝐹‘suc 𝑛))
5553, 54breq12d 5045 . . . . 5 (𝑓 = 𝐹 → ((𝑓𝑛)𝑥(𝑓‘suc 𝑛) ↔ (𝐹𝑛)𝑥(𝐹‘suc 𝑛)))
5655ralbidv 3126 . . . 4 (𝑓 = 𝐹 → (∀𝑛 ∈ ω (𝑓𝑛)𝑥(𝑓‘suc 𝑛) ↔ ∀𝑛 ∈ ω (𝐹𝑛)𝑥(𝐹‘suc 𝑛)))
578, 52, 56spcedv 3517 . . 3 ((∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) ∧ ∃𝑧 𝑠𝑥𝑧 ∧ ran 𝑥 ⊆ dom 𝑥) → ∃𝑓𝑛 ∈ ω (𝑓𝑛)𝑥(𝑓‘suc 𝑛))
58573exp 1116 . 2 (∀𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦) → (∃𝑧 𝑠𝑥𝑧 → (ran 𝑥 ⊆ dom 𝑥 → ∃𝑓𝑛 ∈ ω (𝑓𝑛)𝑥(𝑓‘suc 𝑛))))
59 vex 3413 . . . . 5 𝑥 ∈ V
6059dmex 7621 . . . 4 dom 𝑥 ∈ V
6160pwex 5249 . . 3 𝒫 dom 𝑥 ∈ V
6261ac4c 9936 . 2 𝑔𝑦 ∈ 𝒫 dom 𝑥(𝑦 ≠ ∅ → (𝑔𝑦) ∈ 𝑦)
6358, 62exlimiiv 1932 1 (∃𝑧 𝑠𝑥𝑧 → (ran 𝑥 ⊆ dom 𝑥 → ∃𝑓𝑛 ∈ ω (𝑓𝑛)𝑥(𝑓‘suc 𝑛)))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 399   ∧ w3a 1084   = wceq 1538  ∃wex 1781   ∈ wcel 2111  {cab 2735   ≠ wne 2951  ∀wral 3070  Vcvv 3409   ⊆ wss 3858  ∅c0 4225  𝒫 cpw 4494   class class class wbr 5032   ↦ cmpt 5112  dom cdm 5524  ran crn 5525   ↾ cres 5526  suc csuc 6171   Fn wfn 6330  ‘cfv 6335  ωcom 7579  reccrdg 8055 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 2729  ax-rep 5156  ax-sep 5169  ax-nul 5176  ax-pow 5234  ax-pr 5298  ax-un 7459  ax-inf2 9137  ax-ac2 9923 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2557  df-eu 2588  df-clab 2736  df-cleq 2750  df-clel 2830  df-nfc 2901  df-ne 2952  df-ral 3075  df-rex 3076  df-reu 3077  df-rab 3079  df-v 3411  df-sbc 3697  df-csb 3806  df-dif 3861  df-un 3863  df-in 3865  df-ss 3875  df-pss 3877  df-nul 4226  df-if 4421  df-pw 4496  df-sn 4523  df-pr 4525  df-tp 4527  df-op 4529  df-uni 4799  df-iun 4885  df-br 5033  df-opab 5095  df-mpt 5113  df-tr 5139  df-id 5430  df-eprel 5435  df-po 5443  df-so 5444  df-fr 5483  df-we 5485  df-xp 5530  df-rel 5531  df-cnv 5532  df-co 5533  df-dm 5534  df-rn 5535  df-res 5536  df-ima 5537  df-pred 6126  df-ord 6172  df-on 6173  df-lim 6174  df-suc 6175  df-iota 6294  df-fun 6337  df-fn 6338  df-f 6339  df-f1 6340  df-fo 6341  df-f1o 6342  df-fv 6343  df-om 7580  df-wrecs 7957  df-recs 8018  df-rdg 8056  df-ac 9576 This theorem is referenced by:  axdc  9981
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