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Theorem fxnn0nninf 10373
Description: A function from 0* into . (Contributed by Jim Kingdon, 16-Jul-2022.) TODO: use infnninf 7088 instead of infnninfOLD 7089. More generally, this theorem and most theorems in this section could use an extended 𝐺 defined by 𝐺 = (frec((𝑥 ∈ ℤ ↦ (𝑥 + 1)), 0) ∪ ⟨ω, +∞⟩) and 𝐹 = (𝑛 ∈ suc ω ↦ (𝑖 ∈ ω ↦ if(𝑖𝑛, 1o, ∅))) as in nnnninf2 7091.
Hypotheses
Ref Expression
fxnn0nninf.g 𝐺 = frec((𝑥 ∈ ℤ ↦ (𝑥 + 1)), 0)
fxnn0nninf.f 𝐹 = (𝑛 ∈ ω ↦ (𝑖 ∈ ω ↦ if(𝑖𝑛, 1o, ∅)))
fxnn0nninf.i 𝐼 = ((𝐹𝐺) ∪ {⟨+∞, (ω × {1o})⟩})
Assertion
Ref Expression
fxnn0nninf 𝐼:ℕ0*⟶ℕ
Distinct variable group:   𝑖,𝑛
Allowed substitution hints:   𝐹(𝑥,𝑖,𝑛)   𝐺(𝑥,𝑖,𝑛)   𝐼(𝑥,𝑖,𝑛)

Proof of Theorem fxnn0nninf
StepHypRef Expression
1 fxnn0nninf.g . . . . . 6 𝐺 = frec((𝑥 ∈ ℤ ↦ (𝑥 + 1)), 0)
2 fxnn0nninf.f . . . . . 6 𝐹 = (𝑛 ∈ ω ↦ (𝑖 ∈ ω ↦ if(𝑖𝑛, 1o, ∅)))
31, 2fnn0nninf 10372 . . . . 5 (𝐹𝐺):ℕ0⟶ℕ
4 pnfex 7952 . . . . . . . 8 +∞ ∈ V
5 omex 4570 . . . . . . . . 9 ω ∈ V
6 1oex 6392 . . . . . . . . . 10 1o ∈ V
76snex 4164 . . . . . . . . 9 {1o} ∈ V
85, 7xpex 4719 . . . . . . . 8 (ω × {1o}) ∈ V
94, 8f1osn 5472 . . . . . . 7 {⟨+∞, (ω × {1o})⟩}:{+∞}–1-1-onto→{(ω × {1o})}
10 f1of 5432 . . . . . . 7 ({⟨+∞, (ω × {1o})⟩}:{+∞}–1-1-onto→{(ω × {1o})} → {⟨+∞, (ω × {1o})⟩}:{+∞}⟶{(ω × {1o})})
119, 10ax-mp 5 . . . . . 6 {⟨+∞, (ω × {1o})⟩}:{+∞}⟶{(ω × {1o})}
12 infnninfOLD 7089 . . . . . . 7 (ω × {1o}) ∈ ℕ
13 snssi 3717 . . . . . . 7 ((ω × {1o}) ∈ ℕ → {(ω × {1o})} ⊆ ℕ)
1412, 13ax-mp 5 . . . . . 6 {(ω × {1o})} ⊆ ℕ
15 fss 5349 . . . . . 6 (({⟨+∞, (ω × {1o})⟩}:{+∞}⟶{(ω × {1o})} ∧ {(ω × {1o})} ⊆ ℕ) → {⟨+∞, (ω × {1o})⟩}:{+∞}⟶ℕ)
1611, 14, 15mp2an 423 . . . . 5 {⟨+∞, (ω × {1o})⟩}:{+∞}⟶ℕ
173, 16pm3.2i 270 . . . 4 ((𝐹𝐺):ℕ0⟶ℕ ∧ {⟨+∞, (ω × {1o})⟩}:{+∞}⟶ℕ)
18 disj 3457 . . . . 5 ((ℕ0 ∩ {+∞}) = ∅ ↔ ∀𝑥 ∈ ℕ0 ¬ 𝑥 ∈ {+∞})
19 nn0nepnf 9185 . . . . . . 7 (𝑥 ∈ ℕ0𝑥 ≠ +∞)
2019neneqd 2357 . . . . . 6 (𝑥 ∈ ℕ0 → ¬ 𝑥 = +∞)
21 elsni 3594 . . . . . 6 (𝑥 ∈ {+∞} → 𝑥 = +∞)
2220, 21nsyl 618 . . . . 5 (𝑥 ∈ ℕ0 → ¬ 𝑥 ∈ {+∞})
2318, 22mprgbir 2524 . . . 4 (ℕ0 ∩ {+∞}) = ∅
24 fun2 5361 . . . 4 ((((𝐹𝐺):ℕ0⟶ℕ ∧ {⟨+∞, (ω × {1o})⟩}:{+∞}⟶ℕ) ∧ (ℕ0 ∩ {+∞}) = ∅) → ((𝐹𝐺) ∪ {⟨+∞, (ω × {1o})⟩}):(ℕ0 ∪ {+∞})⟶ℕ)
2517, 23, 24mp2an 423 . . 3 ((𝐹𝐺) ∪ {⟨+∞, (ω × {1o})⟩}):(ℕ0 ∪ {+∞})⟶ℕ
26 fxnn0nninf.i . . . 4 𝐼 = ((𝐹𝐺) ∪ {⟨+∞, (ω × {1o})⟩})
2726feq1i 5330 . . 3 (𝐼:(ℕ0 ∪ {+∞})⟶ℕ ↔ ((𝐹𝐺) ∪ {⟨+∞, (ω × {1o})⟩}):(ℕ0 ∪ {+∞})⟶ℕ)
2825, 27mpbir 145 . 2 𝐼:(ℕ0 ∪ {+∞})⟶ℕ
29 df-xnn0 9178 . . 3 0* = (ℕ0 ∪ {+∞})
3029feq2i 5331 . 2 (𝐼:ℕ0*⟶ℕ𝐼:(ℕ0 ∪ {+∞})⟶ℕ)
3128, 30mpbir 145 1 𝐼:ℕ0*⟶ℕ
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wa 103   = wceq 1343  wcel 2136  cun 3114  cin 3115  wss 3116  c0 3409  ifcif 3520  {csn 3576  cop 3579  cmpt 4043  ωcom 4567   × cxp 4602  ccnv 4603  ccom 4608  wf 5184  1-1-ontowf1o 5187  (class class class)co 5842  freccfrec 6358  1oc1o 6377  xnninf 7084  0cc0 7753  1c1 7754   + caddc 7756  +∞cpnf 7930  0cn0 9114  0*cxnn0 9177  cz 9191
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-coll 4097  ax-sep 4100  ax-nul 4108  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-setind 4514  ax-iinf 4565  ax-cnex 7844  ax-resscn 7845  ax-1cn 7846  ax-1re 7847  ax-icn 7848  ax-addcl 7849  ax-addrcl 7850  ax-mulcl 7851  ax-addcom 7853  ax-addass 7855  ax-distr 7857  ax-i2m1 7858  ax-0lt1 7859  ax-0id 7861  ax-rnegex 7862  ax-cnre 7864  ax-pre-ltirr 7865  ax-pre-ltwlin 7866  ax-pre-lttrn 7867  ax-pre-ltadd 7869
This theorem depends on definitions:  df-bi 116  df-dc 825  df-3or 969  df-3an 970  df-tru 1346  df-fal 1349  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-nel 2432  df-ral 2449  df-rex 2450  df-reu 2451  df-rab 2453  df-v 2728  df-sbc 2952  df-csb 3046  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-nul 3410  df-if 3521  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-int 3825  df-iun 3868  df-br 3983  df-opab 4044  df-mpt 4045  df-tr 4081  df-id 4271  df-iord 4344  df-on 4346  df-ilim 4347  df-suc 4349  df-iom 4568  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617  df-iota 5153  df-fun 5190  df-fn 5191  df-f 5192  df-f1 5193  df-fo 5194  df-f1o 5195  df-fv 5196  df-riota 5798  df-ov 5845  df-oprab 5846  df-mpo 5847  df-recs 6273  df-frec 6359  df-1o 6384  df-2o 6385  df-map 6616  df-nninf 7085  df-pnf 7935  df-mnf 7936  df-xr 7937  df-ltxr 7938  df-le 7939  df-sub 8071  df-neg 8072  df-inn 8858  df-n0 9115  df-xnn0 9178  df-z 9192  df-uz 9467
This theorem is referenced by: (None)
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