Theorem fxnn0nninf 10800

Description: A function from ℕ₀^* into ℕ_∞. (Contributed by Jim Kingdon, 16-Jul-2022.) TODO: use infnninf 7414 instead of infnninfOLD 7415. 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 7417.

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 10799	. . . . 5 ⊢ (𝐹 ∘ ◡𝐺):ℕ0⟶ℕ∞
4		pnfex 8326	. . . . . . . 8 ⊢ +∞ ∈ V
5		omex 4714	. . . . . . . . 9 ⊢ ω ∈ V
6		1oex 6654	. . . . . . . . . 10 ⊢ 1o ∈ V
7	6	snex 4297	. . . . . . . . 9 ⊢ {1o} ∈ V
8	5, 7	xpex 4865	. . . . . . . 8 ⊢ (ω × {1o}) ∈ V
9	4, 8	f1osn 5655	. . . . . . 7 ⊢ {⟨+∞, (ω × {1o})⟩}:{+∞}–1-1-onto→{(ω × {1o})}
10		f1of 5613	. . . . . . 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 7415	. . . . . . 7 ⊢ (ω × {1o}) ∈ ℕ∞
13		snssi 3837	. . . . . . 7 ⊢ ((ω × {1o}) ∈ ℕ∞ → {(ω × {1o})} ⊆ ℕ∞)
14	12, 13	ax-mp 5	. . . . . 6 ⊢ {(ω × {1o})} ⊆ ℕ∞
15		fss 5520	. . . . . 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 3556	. . . . 5 ⊢ ((ℕ0 ∩ {+∞}) = ∅ ↔ ∀𝑥 ∈ ℕ0 ¬ 𝑥 ∈ {+∞})
19		nn0nepnf 9570	. . . . . . 7 ⊢ (𝑥 ∈ ℕ0 → 𝑥 ≠ +∞)
20	19	neneqd 2433	. . . . . 6 ⊢ (𝑥 ∈ ℕ0 → ¬ 𝑥 = +∞)
21		elsni 3706	. . . . . 6 ⊢ (𝑥 ∈ {+∞} → 𝑥 = +∞)
22	20, 21	nsyl 633	. . . . 5 ⊢ (𝑥 ∈ ℕ0 → ¬ 𝑥 ∈ {+∞})
23	18, 22	mprgbir 2600	. . . 4 ⊢ (ℕ0 ∩ {+∞}) = ∅
24		fun2 5536	. . . 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 5500	. . 3 ⊢ (𝐼:(ℕ0 ∪ {+∞})⟶ℕ∞ ↔ ((𝐹 ∘ ◡𝐺) ∪ {⟨+∞, (ω × {1o})⟩}):(ℕ0 ∪ {+∞})⟶ℕ∞)
28	25, 27	mpbir 146	. 2 ⊢ 𝐼:(ℕ0 ∪ {+∞})⟶ℕ∞
29		df-xnn0 9563	. . 3 ⊢ ℕ0* = (ℕ0 ∪ {+∞})
30	29	feq2i 5501	. 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 2203   ∪ cun 3208   ∩ cin 3209   ⊆ wss 3210  ∅c0 3507  ifcif 3619  {csn 3688  ⟨cop 3691   ↦ cmpt 4170  ωcom 4711   × cxp 4746  ^◡ccnv 4747   ∘ ccom 4752  ⟶wf 5347  –1-1-onto→wf1o 5350  (class class class)co 6049  freccfrec 6620  1_oc1o 6639  ℕ_∞xnninf 7409  0cc0 8126  1c1 8127   + caddc 8129  +∞cpnf 8304  ℕ₀cn0 9495  ℕ₀^*cxnn0 9562  ℤcz 9576

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 2205  ax-14 2206  ax-ext 2214  ax-coll 4224  ax-sep 4227  ax-nul 4235  ax-pow 4286  ax-pr 4321  ax-un 4553  ax-setind 4658  ax-iinf 4709  ax-cnex 8217  ax-resscn 8218  ax-1cn 8219  ax-1re 8220  ax-icn 8221  ax-addcl 8222  ax-addrcl 8223  ax-mulcl 8224  ax-addcom 8226  ax-addass 8228  ax-distr 8230  ax-i2m1 8231  ax-0lt1 8232  ax-0id 8234  ax-rnegex 8235  ax-cnre 8237  ax-pre-ltirr 8238  ax-pre-ltwlin 8239  ax-pre-lttrn 8240  ax-pre-ltadd 8242

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 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-nel 2508  df-ral 2525  df-rex 2526  df-reu 2527  df-rab 2529  df-v 2814  df-sbc 3042  df-csb 3138  df-dif 3212  df-un 3214  df-in 3216  df-ss 3223  df-nul 3508  df-if 3620  df-pw 3670  df-sn 3694  df-pr 3695  df-op 3697  df-uni 3914  df-int 3949  df-iun 3992  df-br 4109  df-opab 4171  df-mpt 4172  df-tr 4208  df-id 4413  df-iord 4486  df-on 4488  df-ilim 4489  df-suc 4491  df-iom 4712  df-xp 4754  df-rel 4755  df-cnv 4756  df-co 4757  df-dm 4758  df-rn 4759  df-res 4760  df-ima 4761  df-iota 5311  df-fun 5353  df-fn 5354  df-f 5355  df-f1 5356  df-fo 5357  df-f1o 5358  df-fv 5359  df-riota 6002  df-ov 6052  df-oprab 6053  df-mpo 6054  df-recs 6535  df-frec 6621  df-1o 6646  df-2o 6647  df-map 6883  df-nninf 7410  df-pnf 8309  df-mnf 8310  df-xr 8311  df-ltxr 8312  df-le 8313  df-sub 8445  df-neg 8446  df-inn 9237  df-n0 9496  df-xnn0 9563  df-z 9577  df-uz 9853

This theorem is referenced by:  nninfctlemfo  12732