Theorem nnfoctbdj 39349

Description: There exists a mapping from ℕ onto any (nonempty) countable set of disjoint sets, such that elements in the range of the map are disjoint. (Contributed by Glauco Siliprandi, 17-Aug-2020.)

Hypotheses

Ref	Expression
nnfoctbdj.ctb	⊢ (𝜑 → 𝑋 ≼ ω)
nnfoctbdj.n0	⊢ (𝜑 → 𝑋 ≠ ∅)
nnfoctbdj.dj	⊢ (𝜑 → Disj 𝑦 ∈ 𝑋 𝑦)

Assertion

Ref	Expression
nnfoctbdj	⊢ (𝜑 → ∃𝑓(𝑓:ℕ–onto→(𝑋 ∪ {∅}) ∧ Disj 𝑛 ∈ ℕ (𝑓‘𝑛)))

Distinct variable groups:   𝑓,𝑋,𝑛   𝑦,𝑋,𝑛   𝜑,𝑛,𝑦

Allowed substitution hint:   𝜑(𝑓)

Proof of Theorem nnfoctbdj

Dummy variables 𝑔 𝑥 𝑚 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		nnfoctbdj.ctb	. . 3 ⊢ (𝜑 → 𝑋 ≼ ω)
2		nnfoctbdj.n0	. . 3 ⊢ (𝜑 → 𝑋 ≠ ∅)
3		nnfoctb 38238	. . 3 ⊢ ((𝑋 ≼ ω ∧ 𝑋 ≠ ∅) → ∃𝑔 𝑔:ℕ–onto→𝑋)
4	1, 2, 3	syl2anc 691	. 2 ⊢ (𝜑 → ∃𝑔 𝑔:ℕ–onto→𝑋)
5		fofn 6030	. . . . . . 7 ⊢ (𝑔:ℕ–onto→𝑋 → 𝑔 Fn ℕ)
6	5	adantl 481	. . . . . 6 ⊢ ((𝜑 ∧ 𝑔:ℕ–onto→𝑋) → 𝑔 Fn ℕ)
7		nnex 10903	. . . . . . 7 ⊢ ℕ ∈ V
8	7	a1i 11	. . . . . 6 ⊢ ((𝜑 ∧ 𝑔:ℕ–onto→𝑋) → ℕ ∈ V)
9		ltwenn 12623	. . . . . . 7 ⊢ < We ℕ
10	9	a1i 11	. . . . . 6 ⊢ ((𝜑 ∧ 𝑔:ℕ–onto→𝑋) → < We ℕ)
11	6, 8, 10	wessf1orn 38367	. . . . 5 ⊢ ((𝜑 ∧ 𝑔:ℕ–onto→𝑋) → ∃𝑥 ∈ 𝒫 ℕ(𝑔 ↾ 𝑥):𝑥–1-1-onto→ran 𝑔)
12		elpwi 4117	. . . . . . . . 9 ⊢ (𝑥 ∈ 𝒫 ℕ → 𝑥 ⊆ ℕ)
13	12	3ad2ant2 1076	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑔:ℕ–onto→𝑋) ∧ 𝑥 ∈ 𝒫 ℕ ∧ (𝑔 ↾ 𝑥):𝑥–1-1-onto→ran 𝑔) → 𝑥 ⊆ ℕ)
14		simpr 476	. . . . . . . . . . 11 ⊢ ((𝑔:ℕ–onto→𝑋 ∧ (𝑔 ↾ 𝑥):𝑥–1-1-onto→ran 𝑔) → (𝑔 ↾ 𝑥):𝑥–1-1-onto→ran 𝑔)
15		forn 6031	. . . . . . . . . . . . 13 ⊢ (𝑔:ℕ–onto→𝑋 → ran 𝑔 = 𝑋)
16	15	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝑔:ℕ–onto→𝑋 ∧ (𝑔 ↾ 𝑥):𝑥–1-1-onto→ran 𝑔) → ran 𝑔 = 𝑋)
17	16	f1oeq3d 6047	. . . . . . . . . . 11 ⊢ ((𝑔:ℕ–onto→𝑋 ∧ (𝑔 ↾ 𝑥):𝑥–1-1-onto→ran 𝑔) → ((𝑔 ↾ 𝑥):𝑥–1-1-onto→ran 𝑔 ↔ (𝑔 ↾ 𝑥):𝑥–1-1-onto→𝑋))
18	14, 17	mpbid 221	. . . . . . . . . 10 ⊢ ((𝑔:ℕ–onto→𝑋 ∧ (𝑔 ↾ 𝑥):𝑥–1-1-onto→ran 𝑔) → (𝑔 ↾ 𝑥):𝑥–1-1-onto→𝑋)
19	18	adantll 746	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑔:ℕ–onto→𝑋) ∧ (𝑔 ↾ 𝑥):𝑥–1-1-onto→ran 𝑔) → (𝑔 ↾ 𝑥):𝑥–1-1-onto→𝑋)
20	19	3adant2 1073	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑔:ℕ–onto→𝑋) ∧ 𝑥 ∈ 𝒫 ℕ ∧ (𝑔 ↾ 𝑥):𝑥–1-1-onto→ran 𝑔) → (𝑔 ↾ 𝑥):𝑥–1-1-onto→𝑋)
21		nnfoctbdj.dj	. . . . . . . . . 10 ⊢ (𝜑 → Disj 𝑦 ∈ 𝑋 𝑦)
22	21	adantr 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑔:ℕ–onto→𝑋) → Disj 𝑦 ∈ 𝑋 𝑦)
23	22	3ad2ant1 1075	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑔:ℕ–onto→𝑋) ∧ 𝑥 ∈ 𝒫 ℕ ∧ (𝑔 ↾ 𝑥):𝑥–1-1-onto→ran 𝑔) → Disj 𝑦 ∈ 𝑋 𝑦)
24		eqeq1 2614	. . . . . . . . . . 11 ⊢ (𝑚 = 𝑛 → (𝑚 = 1 ↔ 𝑛 = 1))
25		oveq1 6556	. . . . . . . . . . . . 13 ⊢ (𝑚 = 𝑛 → (𝑚 − 1) = (𝑛 − 1))
26	25	eleq1d 2672	. . . . . . . . . . . 12 ⊢ (𝑚 = 𝑛 → ((𝑚 − 1) ∈ 𝑥 ↔ (𝑛 − 1) ∈ 𝑥))
27	26	notbid 307	. . . . . . . . . . 11 ⊢ (𝑚 = 𝑛 → (¬ (𝑚 − 1) ∈ 𝑥 ↔ ¬ (𝑛 − 1) ∈ 𝑥))
28	24, 27	orbi12d 742	. . . . . . . . . 10 ⊢ (𝑚 = 𝑛 → ((𝑚 = 1 ∨ ¬ (𝑚 − 1) ∈ 𝑥) ↔ (𝑛 = 1 ∨ ¬ (𝑛 − 1) ∈ 𝑥)))
29	25	fveq2d 6107	. . . . . . . . . 10 ⊢ (𝑚 = 𝑛 → ((𝑔 ↾ 𝑥)‘(𝑚 − 1)) = ((𝑔 ↾ 𝑥)‘(𝑛 − 1)))
30	28, 29	ifbieq2d 4061	. . . . . . . . 9 ⊢ (𝑚 = 𝑛 → if((𝑚 = 1 ∨ ¬ (𝑚 − 1) ∈ 𝑥), ∅, ((𝑔 ↾ 𝑥)‘(𝑚 − 1))) = if((𝑛 = 1 ∨ ¬ (𝑛 − 1) ∈ 𝑥), ∅, ((𝑔 ↾ 𝑥)‘(𝑛 − 1))))
31	30	cbvmptv 4678	. . . . . . . 8 ⊢ (𝑚 ∈ ℕ ↦ if((𝑚 = 1 ∨ ¬ (𝑚 − 1) ∈ 𝑥), ∅, ((𝑔 ↾ 𝑥)‘(𝑚 − 1)))) = (𝑛 ∈ ℕ ↦ if((𝑛 = 1 ∨ ¬ (𝑛 − 1) ∈ 𝑥), ∅, ((𝑔 ↾ 𝑥)‘(𝑛 − 1))))
32	13, 20, 23, 31	nnfoctbdjlem 39348	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑔:ℕ–onto→𝑋) ∧ 𝑥 ∈ 𝒫 ℕ ∧ (𝑔 ↾ 𝑥):𝑥–1-1-onto→ran 𝑔) → ∃𝑓(𝑓:ℕ–onto→(𝑋 ∪ {∅}) ∧ Disj 𝑛 ∈ ℕ (𝑓‘𝑛)))
33	32	3exp 1256	. . . . . 6 ⊢ ((𝜑 ∧ 𝑔:ℕ–onto→𝑋) → (𝑥 ∈ 𝒫 ℕ → ((𝑔 ↾ 𝑥):𝑥–1-1-onto→ran 𝑔 → ∃𝑓(𝑓:ℕ–onto→(𝑋 ∪ {∅}) ∧ Disj 𝑛 ∈ ℕ (𝑓‘𝑛)))))
34	33	rexlimdv 3012	. . . . 5 ⊢ ((𝜑 ∧ 𝑔:ℕ–onto→𝑋) → (∃𝑥 ∈ 𝒫 ℕ(𝑔 ↾ 𝑥):𝑥–1-1-onto→ran 𝑔 → ∃𝑓(𝑓:ℕ–onto→(𝑋 ∪ {∅}) ∧ Disj 𝑛 ∈ ℕ (𝑓‘𝑛))))
35	11, 34	mpd 15	. . . 4 ⊢ ((𝜑 ∧ 𝑔:ℕ–onto→𝑋) → ∃𝑓(𝑓:ℕ–onto→(𝑋 ∪ {∅}) ∧ Disj 𝑛 ∈ ℕ (𝑓‘𝑛)))
36	35	ex 449	. . 3 ⊢ (𝜑 → (𝑔:ℕ–onto→𝑋 → ∃𝑓(𝑓:ℕ–onto→(𝑋 ∪ {∅}) ∧ Disj 𝑛 ∈ ℕ (𝑓‘𝑛))))
37	36	exlimdv 1848	. 2 ⊢ (𝜑 → (∃𝑔 𝑔:ℕ–onto→𝑋 → ∃𝑓(𝑓:ℕ–onto→(𝑋 ∪ {∅}) ∧ Disj 𝑛 ∈ ℕ (𝑓‘𝑛))))
38	4, 37	mpd 15	1 ⊢ (𝜑 → ∃𝑓(𝑓:ℕ–onto→(𝑋 ∪ {∅}) ∧ Disj 𝑛 ∈ ℕ (𝑓‘𝑛)))

Syntax hints:  ¬ wn 3   → wi 4   ∨ wo 382   ∧ wa 383   ∧ w3a 1031   = wceq 1475  ∃wex 1695   ∈ wcel 1977   ≠ wne 2780  ∃wrex 2897  Vcvv 3173   ∪ cun 3538   ⊆ wss 3540  ∅c0 3874  ifcif 4036  𝒫 cpw 4108  {csn 4125  Disj wdisj 4553   class class class wbr 4583   ↦ cmpt 4643   We wwe 4996  ran crn 5039   ↾ cres 5040   Fn wfn 5799  –onto→wfo 5802  –1-1-onto→wf1o 5803  ‘cfv 5804  (class class class)co 6549  ωcom 6957   ≼ cdom 7839  1c1 9816   < clt 9953   − cmin 10145  ℕcn 10897

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-inf2 8421  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-iun 4457  df-disj 4554  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-isom 5813  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-er 7629  df-en 7842  df-dom 7843  df-sdom 7844  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-n0 11170  df-z 11255  df-uz 11564  df-rp 11709

This theorem is referenced by:  ismeannd  39360