Theorem fxnn0nninf 10825

Description: A function from ℕ₀^* into ℕ_∞. (Contributed by Jim Kingdon, 16-Jul-2022.) TODO: use infnninf 7428 instead of infnninfOLD 7429. 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(𝑖 ∈ 𝑛, 1_o, ∅))) as in nnnninf2 7431.

Hypotheses

Ref	Expression
fxnn0nninf.g	⊢ 𝐺 = frec((𝑥 ∈ ℤ ↦ (𝑥 + 1)), 0)
fxnn0nninf.f	⊢ 𝐹 = (𝑛 ∈ ω ↦ (𝑖 ∈ ω ↦ if(𝑖 ∈ 𝑛, 1o, ∅)))
fxnn0nninf.i	⊢ 𝐼 = ((𝐹 ∘ ◡𝐺) ∪ {⟨+∞, (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

Step	Hyp	Ref	Expression
1		fxnn0nninf.g	. . . . . 6 ⊢ 𝐺 = frec((𝑥 ∈ ℤ ↦ (𝑥 + 1)), 0)
2		fxnn0nninf.f	. . . . . 6 ⊢ 𝐹 = (𝑛 ∈ ω ↦ (𝑖 ∈ ω ↦ if(𝑖 ∈ 𝑛, 1o, ∅)))
3	1, 2	fnn0nninf 10824	. . . . 5 ⊢ (𝐹 ∘ ◡𝐺):ℕ0⟶ℕ∞
4		pnfex 8343	. . . . . . . 8 ⊢ +∞ ∈ V
5		omex 4720	. . . . . . . . 9 ⊢ ω ∈ V
6		1oex 6668	. . . . . . . . . 10 ⊢ 1o ∈ V
7	6	snex 4303	. . . . . . . . 9 ⊢ {1o} ∈ V
8	5, 7	xpex 4871	. . . . . . . 8 ⊢ (ω × {1o}) ∈ V
9	4, 8	f1osn 5661	. . . . . . 7 ⊢ {⟨+∞, (ω × {1o})⟩}:{+∞}–1-1-onto→{(ω × {1o})}
10		f1of 5619	. . . . . . 7 ⊢ ({⟨+∞, (ω × {1o})⟩}:{+∞}–1-1-onto→{(ω × {1o})} → {⟨+∞, (ω × {1o})⟩}:{+∞}⟶{(ω × {1o})})
11	9, 10	ax-mp 5	. . . . . 6 ⊢ {⟨+∞, (ω × {1o})⟩}:{+∞}⟶{(ω × {1o})}
12		infnninfOLD 7429	. . . . . . 7 ⊢ (ω × {1o}) ∈ ℕ∞
13		snssi 3843	. . . . . . 7 ⊢ ((ω × {1o}) ∈ ℕ∞ → {(ω × {1o})} ⊆ ℕ∞)
14	12, 13	ax-mp 5	. . . . . 6 ⊢ {(ω × {1o})} ⊆ ℕ∞
15		fss 5526	. . . . . 6 ⊢ (({⟨+∞, (ω × {1o})⟩}:{+∞}⟶{(ω × {1o})} ∧ {(ω × {1o})} ⊆ ℕ∞) → {⟨+∞, (ω × {1o})⟩}:{+∞}⟶ℕ∞)
16	11, 14, 15	mp2an 426	. . . . 5 ⊢ {⟨+∞, (ω × {1o})⟩}:{+∞}⟶ℕ∞
17	3, 16	pm3.2i 272	. . . 4 ⊢ ((𝐹 ∘ ◡𝐺):ℕ0⟶ℕ∞ ∧ {⟨+∞, (ω × {1o})⟩}:{+∞}⟶ℕ∞)
18		disj 3561	. . . . 5 ⊢ ((ℕ0 ∩ {+∞}) = ∅ ↔ ∀𝑥 ∈ ℕ0 ¬ 𝑥 ∈ {+∞})
19		nn0nepnf 9588	. . . . . . 7 ⊢ (𝑥 ∈ ℕ0 → 𝑥 ≠ +∞)
20	19	neneqd 2435	. . . . . 6 ⊢ (𝑥 ∈ ℕ0 → ¬ 𝑥 = +∞)
21		elsni 3712	. . . . . 6 ⊢ (𝑥 ∈ {+∞} → 𝑥 = +∞)
22	20, 21	nsyl 633	. . . . 5 ⊢ (𝑥 ∈ ℕ0 → ¬ 𝑥 ∈ {+∞})
23	18, 22	mprgbir 2602	. . . 4 ⊢ (ℕ0 ∩ {+∞}) = ∅
24		fun2 5542	. . . 4 ⊢ ((((𝐹 ∘ ◡𝐺):ℕ0⟶ℕ∞ ∧ {⟨+∞, (ω × {1o})⟩}:{+∞}⟶ℕ∞) ∧ (ℕ0 ∩ {+∞}) = ∅) → ((𝐹 ∘ ◡𝐺) ∪ {⟨+∞, (ω × {1o})⟩}):(ℕ0 ∪ {+∞})⟶ℕ∞)
25	17, 23, 24	mp2an 426	. . 3 ⊢ ((𝐹 ∘ ◡𝐺) ∪ {⟨+∞, (ω × {1o})⟩}):(ℕ0 ∪ {+∞})⟶ℕ∞
26		fxnn0nninf.i	. . . 4 ⊢ 𝐼 = ((𝐹 ∘ ◡𝐺) ∪ {⟨+∞, (ω × {1o})⟩})
27	26	feq1i 5506	. . 3 ⊢ (𝐼:(ℕ0 ∪ {+∞})⟶ℕ∞ ↔ ((𝐹 ∘ ◡𝐺) ∪ {⟨+∞, (ω × {1o})⟩}):(ℕ0 ∪ {+∞})⟶ℕ∞)
28	25, 27	mpbir 146	. 2 ⊢ 𝐼:(ℕ0 ∪ {+∞})⟶ℕ∞
29		df-xnn0 9581	. . 3 ⊢ ℕ0* = (ℕ0 ∪ {+∞})
30	29	feq2i 5507	. 2 ⊢ (𝐼:ℕ0*⟶ℕ∞ ↔ 𝐼:(ℕ0 ∪ {+∞})⟶ℕ∞)
31	28, 30	mpbir 146	1 ⊢ 𝐼:ℕ0*⟶ℕ∞

Syntax hints:  ¬ wn 3   ∧ wa 104   = wceq 1398   ∈ wcel 2205   ∪ cun 3212   ∩ cin 3213   ⊆ wss 3214  ∅c0 3512  ifcif 3624  {csn 3694  ⟨cop 3697   ↦ cmpt 4176  ωcom 4717   × cxp 4752  ^◡ccnv 4753   ∘ ccom 4758  ⟶wf 5353  –1-1-onto→wf1o 5356  (class class class)co 6058  freccfrec 6634  1_oc1o 6653  ℕ_∞xnninf 7423  0cc0 8143  1c1 8144   + caddc 8146  +∞cpnf 8321  ℕ₀cn0 9513  ℕ₀^*cxnn0 9580  ℤcz 9594

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4230  ax-sep 4233  ax-nul 4241  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-iinf 4715  ax-cnex 8234  ax-resscn 8235  ax-1cn 8236  ax-1re 8237  ax-icn 8238  ax-addcl 8239  ax-addrcl 8240  ax-mulcl 8241  ax-addcom 8243  ax-addass 8245  ax-distr 8247  ax-i2m1 8248  ax-0lt1 8249  ax-0id 8251  ax-rnegex 8252  ax-cnre 8254  ax-pre-ltirr 8255  ax-pre-ltwlin 8256  ax-pre-lttrn 8257  ax-pre-ltadd 8259

This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rab 2531  df-v 2817  df-sbc 3046  df-csb 3142  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-if 3625  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-int 3955  df-iun 3998  df-br 4115  df-opab 4177  df-mpt 4178  df-tr 4214  df-id 4419  df-iord 4492  df-on 4494  df-ilim 4495  df-suc 4497  df-iom 4718  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-ima 4767  df-iota 5317  df-fun 5359  df-fn 5360  df-f 5361  df-f1 5362  df-fo 5363  df-f1o 5364  df-fv 5365  df-riota 6011  df-ov 6061  df-oprab 6062  df-mpo 6063  df-recs 6549  df-frec 6635  df-1o 6660  df-2o 6661  df-map 6897  df-nninf 7424  df-pnf 8326  df-mnf 8327  df-xr 8328  df-ltxr 8329  df-le 8330  df-sub 8462  df-neg 8463  df-inn 9255  df-n0 9514  df-xnn0 9581  df-z 9595  df-uz 9872

This theorem is referenced by:  nninfctlemfo  12761