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Theorem uzrdgfni 13316
 Description: The recursive definition generator on upper integers is a function. See comment in om2uzrdg 13314. (Contributed by Mario Carneiro, 26-Jun-2013.) (Revised by Mario Carneiro, 4-May-2015.)
Hypotheses
Ref Expression
om2uz.1 𝐶 ∈ ℤ
om2uz.2 𝐺 = (rec((𝑥 ∈ V ↦ (𝑥 + 1)), 𝐶) ↾ ω)
uzrdg.1 𝐴 ∈ V
uzrdg.2 𝑅 = (rec((𝑥 ∈ V, 𝑦 ∈ V ↦ ⟨(𝑥 + 1), (𝑥𝐹𝑦)⟩), ⟨𝐶, 𝐴⟩) ↾ ω)
uzrdg.3 𝑆 = ran 𝑅
Assertion
Ref Expression
uzrdgfni 𝑆 Fn (ℤ𝐶)
Distinct variable groups:   𝑦,𝐴   𝑥,𝑦,𝐶   𝑦,𝐺   𝑥,𝐹,𝑦
Allowed substitution hints:   𝐴(𝑥)   𝑅(𝑥,𝑦)   𝑆(𝑥,𝑦)   𝐺(𝑥)

Proof of Theorem uzrdgfni
Dummy variables 𝑧 𝑤 𝑣 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 uzrdg.3 . . . . . . . . 9 𝑆 = ran 𝑅
21eleq2i 2909 . . . . . . . 8 (𝑧𝑆𝑧 ∈ ran 𝑅)
3 frfnom 8061 . . . . . . . . . 10 (rec((𝑥 ∈ V, 𝑦 ∈ V ↦ ⟨(𝑥 + 1), (𝑥𝐹𝑦)⟩), ⟨𝐶, 𝐴⟩) ↾ ω) Fn ω
4 uzrdg.2 . . . . . . . . . . 11 𝑅 = (rec((𝑥 ∈ V, 𝑦 ∈ V ↦ ⟨(𝑥 + 1), (𝑥𝐹𝑦)⟩), ⟨𝐶, 𝐴⟩) ↾ ω)
54fneq1i 6447 . . . . . . . . . 10 (𝑅 Fn ω ↔ (rec((𝑥 ∈ V, 𝑦 ∈ V ↦ ⟨(𝑥 + 1), (𝑥𝐹𝑦)⟩), ⟨𝐶, 𝐴⟩) ↾ ω) Fn ω)
63, 5mpbir 232 . . . . . . . . 9 𝑅 Fn ω
7 fvelrnb 6723 . . . . . . . . 9 (𝑅 Fn ω → (𝑧 ∈ ran 𝑅 ↔ ∃𝑤 ∈ ω (𝑅𝑤) = 𝑧))
86, 7ax-mp 5 . . . . . . . 8 (𝑧 ∈ ran 𝑅 ↔ ∃𝑤 ∈ ω (𝑅𝑤) = 𝑧)
92, 8bitri 276 . . . . . . 7 (𝑧𝑆 ↔ ∃𝑤 ∈ ω (𝑅𝑤) = 𝑧)
10 om2uz.1 . . . . . . . . . . 11 𝐶 ∈ ℤ
11 om2uz.2 . . . . . . . . . . 11 𝐺 = (rec((𝑥 ∈ V ↦ (𝑥 + 1)), 𝐶) ↾ ω)
12 uzrdg.1 . . . . . . . . . . 11 𝐴 ∈ V
1310, 11, 12, 4om2uzrdg 13314 . . . . . . . . . 10 (𝑤 ∈ ω → (𝑅𝑤) = ⟨(𝐺𝑤), (2nd ‘(𝑅𝑤))⟩)
1410, 11om2uzuzi 13307 . . . . . . . . . . 11 (𝑤 ∈ ω → (𝐺𝑤) ∈ (ℤ𝐶))
15 fvex 6680 . . . . . . . . . . 11 (2nd ‘(𝑅𝑤)) ∈ V
16 opelxpi 5591 . . . . . . . . . . 11 (((𝐺𝑤) ∈ (ℤ𝐶) ∧ (2nd ‘(𝑅𝑤)) ∈ V) → ⟨(𝐺𝑤), (2nd ‘(𝑅𝑤))⟩ ∈ ((ℤ𝐶) × V))
1714, 15, 16sylancl 586 . . . . . . . . . 10 (𝑤 ∈ ω → ⟨(𝐺𝑤), (2nd ‘(𝑅𝑤))⟩ ∈ ((ℤ𝐶) × V))
1813, 17eqeltrd 2918 . . . . . . . . 9 (𝑤 ∈ ω → (𝑅𝑤) ∈ ((ℤ𝐶) × V))
19 eleq1 2905 . . . . . . . . 9 ((𝑅𝑤) = 𝑧 → ((𝑅𝑤) ∈ ((ℤ𝐶) × V) ↔ 𝑧 ∈ ((ℤ𝐶) × V)))
2018, 19syl5ibcom 246 . . . . . . . 8 (𝑤 ∈ ω → ((𝑅𝑤) = 𝑧𝑧 ∈ ((ℤ𝐶) × V)))
2120rexlimiv 3285 . . . . . . 7 (∃𝑤 ∈ ω (𝑅𝑤) = 𝑧𝑧 ∈ ((ℤ𝐶) × V))
229, 21sylbi 218 . . . . . 6 (𝑧𝑆𝑧 ∈ ((ℤ𝐶) × V))
2322ssriv 3975 . . . . 5 𝑆 ⊆ ((ℤ𝐶) × V)
24 xpss 5570 . . . . 5 ((ℤ𝐶) × V) ⊆ (V × V)
2523, 24sstri 3980 . . . 4 𝑆 ⊆ (V × V)
26 df-rel 5561 . . . 4 (Rel 𝑆𝑆 ⊆ (V × V))
2725, 26mpbir 232 . . 3 Rel 𝑆
28 fvex 6680 . . . . . 6 (2nd ‘(𝑅‘(𝐺𝑣))) ∈ V
29 eqeq2 2838 . . . . . . . 8 (𝑤 = (2nd ‘(𝑅‘(𝐺𝑣))) → (𝑧 = 𝑤𝑧 = (2nd ‘(𝑅‘(𝐺𝑣)))))
3029imbi2d 342 . . . . . . 7 (𝑤 = (2nd ‘(𝑅‘(𝐺𝑣))) → ((⟨𝑣, 𝑧⟩ ∈ 𝑆𝑧 = 𝑤) ↔ (⟨𝑣, 𝑧⟩ ∈ 𝑆𝑧 = (2nd ‘(𝑅‘(𝐺𝑣))))))
3130albidv 1914 . . . . . 6 (𝑤 = (2nd ‘(𝑅‘(𝐺𝑣))) → (∀𝑧(⟨𝑣, 𝑧⟩ ∈ 𝑆𝑧 = 𝑤) ↔ ∀𝑧(⟨𝑣, 𝑧⟩ ∈ 𝑆𝑧 = (2nd ‘(𝑅‘(𝐺𝑣))))))
3228, 31spcev 3611 . . . . 5 (∀𝑧(⟨𝑣, 𝑧⟩ ∈ 𝑆𝑧 = (2nd ‘(𝑅‘(𝐺𝑣)))) → ∃𝑤𝑧(⟨𝑣, 𝑧⟩ ∈ 𝑆𝑧 = 𝑤))
331eleq2i 2909 . . . . . . 7 (⟨𝑣, 𝑧⟩ ∈ 𝑆 ↔ ⟨𝑣, 𝑧⟩ ∈ ran 𝑅)
34 fvelrnb 6723 . . . . . . . 8 (𝑅 Fn ω → (⟨𝑣, 𝑧⟩ ∈ ran 𝑅 ↔ ∃𝑤 ∈ ω (𝑅𝑤) = ⟨𝑣, 𝑧⟩))
356, 34ax-mp 5 . . . . . . 7 (⟨𝑣, 𝑧⟩ ∈ ran 𝑅 ↔ ∃𝑤 ∈ ω (𝑅𝑤) = ⟨𝑣, 𝑧⟩)
3633, 35bitri 276 . . . . . 6 (⟨𝑣, 𝑧⟩ ∈ 𝑆 ↔ ∃𝑤 ∈ ω (𝑅𝑤) = ⟨𝑣, 𝑧⟩)
3713eqeq1d 2828 . . . . . . . . . . . 12 (𝑤 ∈ ω → ((𝑅𝑤) = ⟨𝑣, 𝑧⟩ ↔ ⟨(𝐺𝑤), (2nd ‘(𝑅𝑤))⟩ = ⟨𝑣, 𝑧⟩))
38 fvex 6680 . . . . . . . . . . . . 13 (𝐺𝑤) ∈ V
3938, 15opth1 5364 . . . . . . . . . . . 12 (⟨(𝐺𝑤), (2nd ‘(𝑅𝑤))⟩ = ⟨𝑣, 𝑧⟩ → (𝐺𝑤) = 𝑣)
4037, 39syl6bi 254 . . . . . . . . . . 11 (𝑤 ∈ ω → ((𝑅𝑤) = ⟨𝑣, 𝑧⟩ → (𝐺𝑤) = 𝑣))
4110, 11om2uzf1oi 13311 . . . . . . . . . . . 12 𝐺:ω–1-1-onto→(ℤ𝐶)
42 f1ocnvfv 7029 . . . . . . . . . . . 12 ((𝐺:ω–1-1-onto→(ℤ𝐶) ∧ 𝑤 ∈ ω) → ((𝐺𝑤) = 𝑣 → (𝐺𝑣) = 𝑤))
4341, 42mpan 686 . . . . . . . . . . 11 (𝑤 ∈ ω → ((𝐺𝑤) = 𝑣 → (𝐺𝑣) = 𝑤))
4440, 43syld 47 . . . . . . . . . 10 (𝑤 ∈ ω → ((𝑅𝑤) = ⟨𝑣, 𝑧⟩ → (𝐺𝑣) = 𝑤))
45 2fveq3 6672 . . . . . . . . . 10 ((𝐺𝑣) = 𝑤 → (2nd ‘(𝑅‘(𝐺𝑣))) = (2nd ‘(𝑅𝑤)))
4644, 45syl6 35 . . . . . . . . 9 (𝑤 ∈ ω → ((𝑅𝑤) = ⟨𝑣, 𝑧⟩ → (2nd ‘(𝑅‘(𝐺𝑣))) = (2nd ‘(𝑅𝑤))))
4746imp 407 . . . . . . . 8 ((𝑤 ∈ ω ∧ (𝑅𝑤) = ⟨𝑣, 𝑧⟩) → (2nd ‘(𝑅‘(𝐺𝑣))) = (2nd ‘(𝑅𝑤)))
48 vex 3503 . . . . . . . . . 10 𝑣 ∈ V
49 vex 3503 . . . . . . . . . 10 𝑧 ∈ V
5048, 49op2ndd 7691 . . . . . . . . 9 ((𝑅𝑤) = ⟨𝑣, 𝑧⟩ → (2nd ‘(𝑅𝑤)) = 𝑧)
5150adantl 482 . . . . . . . 8 ((𝑤 ∈ ω ∧ (𝑅𝑤) = ⟨𝑣, 𝑧⟩) → (2nd ‘(𝑅𝑤)) = 𝑧)
5247, 51eqtr2d 2862 . . . . . . 7 ((𝑤 ∈ ω ∧ (𝑅𝑤) = ⟨𝑣, 𝑧⟩) → 𝑧 = (2nd ‘(𝑅‘(𝐺𝑣))))
5352rexlimiva 3286 . . . . . 6 (∃𝑤 ∈ ω (𝑅𝑤) = ⟨𝑣, 𝑧⟩ → 𝑧 = (2nd ‘(𝑅‘(𝐺𝑣))))
5436, 53sylbi 218 . . . . 5 (⟨𝑣, 𝑧⟩ ∈ 𝑆𝑧 = (2nd ‘(𝑅‘(𝐺𝑣))))
5532, 54mpg 1791 . . . 4 𝑤𝑧(⟨𝑣, 𝑧⟩ ∈ 𝑆𝑧 = 𝑤)
5655ax-gen 1789 . . 3 𝑣𝑤𝑧(⟨𝑣, 𝑧⟩ ∈ 𝑆𝑧 = 𝑤)
57 dffun5 6365 . . 3 (Fun 𝑆 ↔ (Rel 𝑆 ∧ ∀𝑣𝑤𝑧(⟨𝑣, 𝑧⟩ ∈ 𝑆𝑧 = 𝑤)))
5827, 56, 57mpbir2an 707 . 2 Fun 𝑆
59 dmss 5770 . . . . 5 (𝑆 ⊆ ((ℤ𝐶) × V) → dom 𝑆 ⊆ dom ((ℤ𝐶) × V))
6023, 59ax-mp 5 . . . 4 dom 𝑆 ⊆ dom ((ℤ𝐶) × V)
61 dmxpss 6026 . . . 4 dom ((ℤ𝐶) × V) ⊆ (ℤ𝐶)
6260, 61sstri 3980 . . 3 dom 𝑆 ⊆ (ℤ𝐶)
6310, 11, 12, 4uzrdglem 13315 . . . . . 6 (𝑣 ∈ (ℤ𝐶) → ⟨𝑣, (2nd ‘(𝑅‘(𝐺𝑣)))⟩ ∈ ran 𝑅)
6463, 1syl6eleqr 2929 . . . . 5 (𝑣 ∈ (ℤ𝐶) → ⟨𝑣, (2nd ‘(𝑅‘(𝐺𝑣)))⟩ ∈ 𝑆)
6548, 28opeldm 5775 . . . . 5 (⟨𝑣, (2nd ‘(𝑅‘(𝐺𝑣)))⟩ ∈ 𝑆𝑣 ∈ dom 𝑆)
6664, 65syl 17 . . . 4 (𝑣 ∈ (ℤ𝐶) → 𝑣 ∈ dom 𝑆)
6766ssriv 3975 . . 3 (ℤ𝐶) ⊆ dom 𝑆
6862, 67eqssi 3987 . 2 dom 𝑆 = (ℤ𝐶)
69 df-fn 6355 . 2 (𝑆 Fn (ℤ𝐶) ↔ (Fun 𝑆 ∧ dom 𝑆 = (ℤ𝐶)))
7058, 68, 69mpbir2an 707 1 𝑆 Fn (ℤ𝐶)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 207   ∧ wa 396  ∀wal 1528   = wceq 1530  ∃wex 1773   ∈ wcel 2107  ∃wrex 3144  Vcvv 3500   ⊆ wss 3940  ⟨cop 4570   ↦ cmpt 5143   × cxp 5552  ◡ccnv 5553  dom cdm 5554  ran crn 5555   ↾ cres 5556  Rel wrel 5559  Fun wfun 6346   Fn wfn 6347  –1-1-onto→wf1o 6351  ‘cfv 6352  (class class class)co 7148   ∈ cmpo 7150  ωcom 7568  2nd c2nd 7679  reccrdg 8036  1c1 10527   + caddc 10529  ℤcz 11970  ℤ≥cuz 12232 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1904  ax-6 1963  ax-7 2008  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2153  ax-12 2169  ax-ext 2798  ax-sep 5200  ax-nul 5207  ax-pow 5263  ax-pr 5326  ax-un 7451  ax-cnex 10582  ax-resscn 10583  ax-1cn 10584  ax-icn 10585  ax-addcl 10586  ax-addrcl 10587  ax-mulcl 10588  ax-mulrcl 10589  ax-mulcom 10590  ax-addass 10591  ax-mulass 10592  ax-distr 10593  ax-i2m1 10594  ax-1ne0 10595  ax-1rid 10596  ax-rnegex 10597  ax-rrecex 10598  ax-cnre 10599  ax-pre-lttri 10600  ax-pre-lttrn 10601  ax-pre-ltadd 10602  ax-pre-mulgt0 10603 This theorem depends on definitions:  df-bi 208  df-an 397  df-or 844  df-3or 1082  df-3an 1083  df-tru 1533  df-ex 1774  df-nf 1778  df-sb 2063  df-mo 2620  df-eu 2652  df-clab 2805  df-cleq 2819  df-clel 2898  df-nfc 2968  df-ne 3022  df-nel 3129  df-ral 3148  df-rex 3149  df-reu 3150  df-rab 3152  df-v 3502  df-sbc 3777  df-csb 3888  df-dif 3943  df-un 3945  df-in 3947  df-ss 3956  df-pss 3958  df-nul 4296  df-if 4471  df-pw 4544  df-sn 4565  df-pr 4567  df-tp 4569  df-op 4571  df-uni 4838  df-iun 4919  df-br 5064  df-opab 5126  df-mpt 5144  df-tr 5170  df-id 5459  df-eprel 5464  df-po 5473  df-so 5474  df-fr 5513  df-we 5515  df-xp 5560  df-rel 5561  df-cnv 5562  df-co 5563  df-dm 5564  df-rn 5565  df-res 5566  df-ima 5567  df-pred 6146  df-ord 6192  df-on 6193  df-lim 6194  df-suc 6195  df-iota 6312  df-fun 6354  df-fn 6355  df-f 6356  df-f1 6357  df-fo 6358  df-f1o 6359  df-fv 6360  df-riota 7106  df-ov 7151  df-oprab 7152  df-mpo 7153  df-om 7569  df-2nd 7681  df-wrecs 7938  df-recs 7999  df-rdg 8037  df-er 8279  df-en 8499  df-dom 8500  df-sdom 8501  df-pnf 10666  df-mnf 10667  df-xr 10668  df-ltxr 10669  df-le 10670  df-sub 10861  df-neg 10862  df-nn 11628  df-n0 11887  df-z 11971  df-uz 12233 This theorem is referenced by:  uzrdg0i  13317  uzrdgsuci  13318  seqfn  13371
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