Theorem fxnn0nninf 10702

Description: A function from ℕ₀^* into ℕ_∞. (Contributed by Jim Kingdon, 16-Jul-2022.) TODO: use infnninf 7323 instead of infnninfOLD 7324. 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 7326.

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 10701	. . . . 5 ⊢ (𝐹 ∘ ◡𝐺):ℕ0⟶ℕ∞
4		pnfex 8233	. . . . . . . 8 ⊢ +∞ ∈ V
5		omex 4691	. . . . . . . . 9 ⊢ ω ∈ V
6		1oex 6590	. . . . . . . . . 10 ⊢ 1o ∈ V
7	6	snex 4275	. . . . . . . . 9 ⊢ {1o} ∈ V
8	5, 7	xpex 4842	. . . . . . . 8 ⊢ (ω × {1o}) ∈ V
9	4, 8	f1osn 5625	. . . . . . 7 ⊢ {⟨+∞, (ω × {1o})⟩}:{+∞}–1-1-onto→{(ω × {1o})}
10		f1of 5583	. . . . . . 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 7324	. . . . . . 7 ⊢ (ω × {1o}) ∈ ℕ∞
13		snssi 3817	. . . . . . 7 ⊢ ((ω × {1o}) ∈ ℕ∞ → {(ω × {1o})} ⊆ ℕ∞)
14	12, 13	ax-mp 5	. . . . . 6 ⊢ {(ω × {1o})} ⊆ ℕ∞
15		fss 5494	. . . . . 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 3543	. . . . 5 ⊢ ((ℕ0 ∩ {+∞}) = ∅ ↔ ∀𝑥 ∈ ℕ0 ¬ 𝑥 ∈ {+∞})
19		nn0nepnf 9473	. . . . . . 7 ⊢ (𝑥 ∈ ℕ0 → 𝑥 ≠ +∞)
20	19	neneqd 2423	. . . . . 6 ⊢ (𝑥 ∈ ℕ0 → ¬ 𝑥 = +∞)
21		elsni 3687	. . . . . 6 ⊢ (𝑥 ∈ {+∞} → 𝑥 = +∞)
22	20, 21	nsyl 633	. . . . 5 ⊢ (𝑥 ∈ ℕ0 → ¬ 𝑥 ∈ {+∞})
23	18, 22	mprgbir 2590	. . . 4 ⊢ (ℕ0 ∩ {+∞}) = ∅
24		fun2 5509	. . . 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 5475	. . 3 ⊢ (𝐼:(ℕ0 ∪ {+∞})⟶ℕ∞ ↔ ((𝐹 ∘ ◡𝐺) ∪ {⟨+∞, (ω × {1o})⟩}):(ℕ0 ∪ {+∞})⟶ℕ∞)
28	25, 27	mpbir 146	. 2 ⊢ 𝐼:(ℕ0 ∪ {+∞})⟶ℕ∞
29		df-xnn0 9466	. . 3 ⊢ ℕ0* = (ℕ0 ∪ {+∞})
30	29	feq2i 5476	. 2 ⊢ (𝐼:ℕ0*⟶ℕ∞ ↔ 𝐼:(ℕ0 ∪ {+∞})⟶ℕ∞)
31	28, 30	mpbir 146	1 ⊢ 𝐼:ℕ0*⟶ℕ∞

Syntax hints:  ¬ wn 3   ∧ wa 104   = wceq 1397   ∈ wcel 2202   ∪ cun 3198   ∩ cin 3199   ⊆ wss 3200  ∅c0 3494  ifcif 3605  {csn 3669  ⟨cop 3672   ↦ cmpt 4150  ωcom 4688   × cxp 4723  ^◡ccnv 4724   ∘ ccom 4729  ⟶wf 5322  –1-1-onto→wf1o 5325  (class class class)co 6018  freccfrec 6556  1_oc1o 6575  ℕ_∞xnninf 7318  0cc0 8032  1c1 8033   + caddc 8035  +∞cpnf 8211  ℕ₀cn0 9402  ℕ₀^*cxnn0 9465  ℤcz 9479

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-iinf 4686  ax-cnex 8123  ax-resscn 8124  ax-1cn 8125  ax-1re 8126  ax-icn 8127  ax-addcl 8128  ax-addrcl 8129  ax-mulcl 8130  ax-addcom 8132  ax-addass 8134  ax-distr 8136  ax-i2m1 8137  ax-0lt1 8138  ax-0id 8140  ax-rnegex 8141  ax-cnre 8143  ax-pre-ltirr 8144  ax-pre-ltwlin 8145  ax-pre-lttrn 8146  ax-pre-ltadd 8148

This theorem depends on definitions:  df-bi 117  df-dc 842  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-reu 2517  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-if 3606  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-tr 4188  df-id 4390  df-iord 4463  df-on 4465  df-ilim 4466  df-suc 4468  df-iom 4689  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-riota 5971  df-ov 6021  df-oprab 6022  df-mpo 6023  df-recs 6471  df-frec 6557  df-1o 6582  df-2o 6583  df-map 6819  df-nninf 7319  df-pnf 8216  df-mnf 8217  df-xr 8218  df-ltxr 8219  df-le 8220  df-sub 8352  df-neg 8353  df-inn 9144  df-n0 9403  df-xnn0 9466  df-z 9480  df-uz 9756

This theorem is referenced by:  nninfctlemfo  12616