Theorem ishashinf 13247

Description: Any set that is not finite contains subsets of arbitrarily large finite cardinality. Cf. isinf 8173. (Contributed by Thierry Arnoux, 5-Jul-2017.)

Assertion

Ref	Expression
ishashinf	⊢ (¬ 𝐴 ∈ Fin → ∀𝑛 ∈ ℕ ∃𝑥 ∈ 𝒫 𝐴(#‘𝑥) = 𝑛)

Distinct variable group:   𝑥,𝑛,𝐴

Proof of Theorem ishashinf

Dummy variable 𝑎 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		fzfid 12772	. . . . . 6 ⊢ (𝑛 ∈ ℕ → (1...𝑛) ∈ Fin)
2		ficardom 8787	. . . . . 6 ⊢ ((1...𝑛) ∈ Fin → (card‘(1...𝑛)) ∈ ω)
3	1, 2	syl 17	. . . . 5 ⊢ (𝑛 ∈ ℕ → (card‘(1...𝑛)) ∈ ω)
4		isinf 8173	. . . . 5 ⊢ (¬ 𝐴 ∈ Fin → ∀𝑎 ∈ ω ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎))
5		breq2 4657	. . . . . . . 8 ⊢ (𝑎 = (card‘(1...𝑛)) → (𝑥 ≈ 𝑎 ↔ 𝑥 ≈ (card‘(1...𝑛))))
6	5	anbi2d 740	. . . . . . 7 ⊢ (𝑎 = (card‘(1...𝑛)) → ((𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎) ↔ (𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛)))))
7	6	exbidv 1850	. . . . . 6 ⊢ (𝑎 = (card‘(1...𝑛)) → (∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎) ↔ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛)))))
8	7	rspcva 3307	. . . . 5 ⊢ (((card‘(1...𝑛)) ∈ ω ∧ ∀𝑎 ∈ ω ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎)) → ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛))))
9	3, 4, 8	syl2anr 495	. . . 4 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛))))
10		selpw 4165	. . . . . . . 8 ⊢ (𝑥 ∈ 𝒫 𝐴 ↔ 𝑥 ⊆ 𝐴)
11	10	biimpri 218	. . . . . . 7 ⊢ (𝑥 ⊆ 𝐴 → 𝑥 ∈ 𝒫 𝐴)
12	11	a1i 11	. . . . . 6 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → (𝑥 ⊆ 𝐴 → 𝑥 ∈ 𝒫 𝐴))
13		hasheni 13136	. . . . . . . . 9 ⊢ (𝑥 ≈ (card‘(1...𝑛)) → (#‘𝑥) = (#‘(card‘(1...𝑛))))
14	13	adantl 482	. . . . . . . 8 ⊢ (((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) ∧ 𝑥 ≈ (card‘(1...𝑛))) → (#‘𝑥) = (#‘(card‘(1...𝑛))))
15		hashcard 13146	. . . . . . . . . . 11 ⊢ ((1...𝑛) ∈ Fin → (#‘(card‘(1...𝑛))) = (#‘(1...𝑛)))
16	1, 15	syl 17	. . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (#‘(card‘(1...𝑛))) = (#‘(1...𝑛)))
17		nnnn0 11299	. . . . . . . . . . 11 ⊢ (𝑛 ∈ ℕ → 𝑛 ∈ ℕ0)
18		hashfz1 13134	. . . . . . . . . . 11 ⊢ (𝑛 ∈ ℕ0 → (#‘(1...𝑛)) = 𝑛)
19	17, 18	syl 17	. . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (#‘(1...𝑛)) = 𝑛)
20	16, 19	eqtrd 2656	. . . . . . . . 9 ⊢ (𝑛 ∈ ℕ → (#‘(card‘(1...𝑛))) = 𝑛)
21	20	ad2antlr 763	. . . . . . . 8 ⊢ (((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) ∧ 𝑥 ≈ (card‘(1...𝑛))) → (#‘(card‘(1...𝑛))) = 𝑛)
22	14, 21	eqtrd 2656	. . . . . . 7 ⊢ (((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) ∧ 𝑥 ≈ (card‘(1...𝑛))) → (#‘𝑥) = 𝑛)
23	22	ex 450	. . . . . 6 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → (𝑥 ≈ (card‘(1...𝑛)) → (#‘𝑥) = 𝑛))
24	12, 23	anim12d 586	. . . . 5 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → ((𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛))) → (𝑥 ∈ 𝒫 𝐴 ∧ (#‘𝑥) = 𝑛)))
25	24	eximdv 1846	. . . 4 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → (∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛))) → ∃𝑥(𝑥 ∈ 𝒫 𝐴 ∧ (#‘𝑥) = 𝑛)))
26	9, 25	mpd 15	. . 3 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → ∃𝑥(𝑥 ∈ 𝒫 𝐴 ∧ (#‘𝑥) = 𝑛))
27		df-rex 2918	. . 3 ⊢ (∃𝑥 ∈ 𝒫 𝐴(#‘𝑥) = 𝑛 ↔ ∃𝑥(𝑥 ∈ 𝒫 𝐴 ∧ (#‘𝑥) = 𝑛))
28	26, 27	sylibr 224	. 2 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → ∃𝑥 ∈ 𝒫 𝐴(#‘𝑥) = 𝑛)
29	28	ralrimiva 2966	1 ⊢ (¬ 𝐴 ∈ Fin → ∀𝑛 ∈ ℕ ∃𝑥 ∈ 𝒫 𝐴(#‘𝑥) = 𝑛)

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 384   = wceq 1483  ∃wex 1704   ∈ wcel 1990  ∀wral 2912  ∃wrex 2913   ⊆ wss 3574  𝒫 cpw 4158   class class class wbr 4653  ‘cfv 5888  (class class class)co 6650  ωcom 7065   ≈ cen 7952  Fincfn 7955  cardccrd 8761  1c1 9937  ℕcn 11020  ℕ₀cn0 11292  ...cfz 12326  #chash 13117

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-er 7742  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-card 8765  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-nn 11021  df-n0 11293  df-z 11378  df-uz 11688  df-fz 12327  df-hash 13118

This theorem is referenced by:  esumcst  30125  sge0rpcpnf  40638