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Mirrors > Home > MPE Home > Th. List > ishashinf | Structured version Visualization version GIF version |
Description: Any set that is not finite contains subsets of arbitrarily large finite cardinality. Cf. isinf 8731. (Contributed by Thierry Arnoux, 5-Jul-2017.) |
Ref | Expression |
---|---|
ishashinf | ⊢ (¬ 𝐴 ∈ Fin → ∀𝑛 ∈ ℕ ∃𝑥 ∈ 𝒫 𝐴(♯‘𝑥) = 𝑛) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fzfid 13342 | . . . . . 6 ⊢ (𝑛 ∈ ℕ → (1...𝑛) ∈ Fin) | |
2 | ficardom 9390 | . . . . . 6 ⊢ ((1...𝑛) ∈ Fin → (card‘(1...𝑛)) ∈ ω) | |
3 | 1, 2 | syl 17 | . . . . 5 ⊢ (𝑛 ∈ ℕ → (card‘(1...𝑛)) ∈ ω) |
4 | isinf 8731 | . . . . 5 ⊢ (¬ 𝐴 ∈ Fin → ∀𝑎 ∈ ω ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎)) | |
5 | breq2 5070 | . . . . . . . 8 ⊢ (𝑎 = (card‘(1...𝑛)) → (𝑥 ≈ 𝑎 ↔ 𝑥 ≈ (card‘(1...𝑛)))) | |
6 | 5 | anbi2d 630 | . . . . . . 7 ⊢ (𝑎 = (card‘(1...𝑛)) → ((𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎) ↔ (𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛))))) |
7 | 6 | exbidv 1922 | . . . . . 6 ⊢ (𝑎 = (card‘(1...𝑛)) → (∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎) ↔ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛))))) |
8 | 7 | rspcva 3621 | . . . . 5 ⊢ (((card‘(1...𝑛)) ∈ ω ∧ ∀𝑎 ∈ ω ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎)) → ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛)))) |
9 | 3, 4, 8 | syl2anr 598 | . . . 4 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛)))) |
10 | velpw 4544 | . . . . . . . 8 ⊢ (𝑥 ∈ 𝒫 𝐴 ↔ 𝑥 ⊆ 𝐴) | |
11 | 10 | biimpri 230 | . . . . . . 7 ⊢ (𝑥 ⊆ 𝐴 → 𝑥 ∈ 𝒫 𝐴) |
12 | 11 | a1i 11 | . . . . . 6 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → (𝑥 ⊆ 𝐴 → 𝑥 ∈ 𝒫 𝐴)) |
13 | hasheni 13709 | . . . . . . . . 9 ⊢ (𝑥 ≈ (card‘(1...𝑛)) → (♯‘𝑥) = (♯‘(card‘(1...𝑛)))) | |
14 | 13 | adantl 484 | . . . . . . . 8 ⊢ (((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) ∧ 𝑥 ≈ (card‘(1...𝑛))) → (♯‘𝑥) = (♯‘(card‘(1...𝑛)))) |
15 | hashcard 13717 | . . . . . . . . . . 11 ⊢ ((1...𝑛) ∈ Fin → (♯‘(card‘(1...𝑛))) = (♯‘(1...𝑛))) | |
16 | 1, 15 | syl 17 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (♯‘(card‘(1...𝑛))) = (♯‘(1...𝑛))) |
17 | nnnn0 11905 | . . . . . . . . . . 11 ⊢ (𝑛 ∈ ℕ → 𝑛 ∈ ℕ0) | |
18 | hashfz1 13707 | . . . . . . . . . . 11 ⊢ (𝑛 ∈ ℕ0 → (♯‘(1...𝑛)) = 𝑛) | |
19 | 17, 18 | syl 17 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (♯‘(1...𝑛)) = 𝑛) |
20 | 16, 19 | eqtrd 2856 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℕ → (♯‘(card‘(1...𝑛))) = 𝑛) |
21 | 20 | ad2antlr 725 | . . . . . . . 8 ⊢ (((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) ∧ 𝑥 ≈ (card‘(1...𝑛))) → (♯‘(card‘(1...𝑛))) = 𝑛) |
22 | 14, 21 | eqtrd 2856 | . . . . . . 7 ⊢ (((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) ∧ 𝑥 ≈ (card‘(1...𝑛))) → (♯‘𝑥) = 𝑛) |
23 | 22 | ex 415 | . . . . . 6 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → (𝑥 ≈ (card‘(1...𝑛)) → (♯‘𝑥) = 𝑛)) |
24 | 12, 23 | anim12d 610 | . . . . 5 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → ((𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛))) → (𝑥 ∈ 𝒫 𝐴 ∧ (♯‘𝑥) = 𝑛))) |
25 | 24 | eximdv 1918 | . . . 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 3144 | . . 3 ⊢ (∃𝑥 ∈ 𝒫 𝐴(♯‘𝑥) = 𝑛 ↔ ∃𝑥(𝑥 ∈ 𝒫 𝐴 ∧ (♯‘𝑥) = 𝑛)) | |
28 | 26, 27 | sylibr 236 | . 2 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → ∃𝑥 ∈ 𝒫 𝐴(♯‘𝑥) = 𝑛) |
29 | 28 | ralrimiva 3182 | 1 ⊢ (¬ 𝐴 ∈ Fin → ∀𝑛 ∈ ℕ ∃𝑥 ∈ 𝒫 𝐴(♯‘𝑥) = 𝑛) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 398 = wceq 1537 ∃wex 1780 ∈ wcel 2114 ∀wral 3138 ∃wrex 3139 ⊆ wss 3936 𝒫 cpw 4539 class class class wbr 5066 ‘cfv 6355 (class class class)co 7156 ωcom 7580 ≈ cen 8506 Fincfn 8509 cardccrd 9364 1c1 10538 ℕcn 11638 ℕ0cn0 11898 ...cfz 12893 ♯chash 13691 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 ax-cnex 10593 ax-resscn 10594 ax-1cn 10595 ax-icn 10596 ax-addcl 10597 ax-addrcl 10598 ax-mulcl 10599 ax-mulrcl 10600 ax-mulcom 10601 ax-addass 10602 ax-mulass 10603 ax-distr 10604 ax-i2m1 10605 ax-1ne0 10606 ax-1rid 10607 ax-rnegex 10608 ax-rrecex 10609 ax-cnre 10610 ax-pre-lttri 10611 ax-pre-lttrn 10612 ax-pre-ltadd 10613 ax-pre-mulgt0 10614 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4839 df-int 4877 df-iun 4921 df-br 5067 df-opab 5129 df-mpt 5147 df-tr 5173 df-id 5460 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-we 5516 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-pred 6148 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-riota 7114 df-ov 7159 df-oprab 7160 df-mpo 7161 df-om 7581 df-1st 7689 df-2nd 7690 df-wrecs 7947 df-recs 8008 df-rdg 8046 df-1o 8102 df-er 8289 df-en 8510 df-dom 8511 df-sdom 8512 df-fin 8513 df-card 9368 df-pnf 10677 df-mnf 10678 df-xr 10679 df-ltxr 10680 df-le 10681 df-sub 10872 df-neg 10873 df-nn 11639 df-n0 11899 df-z 11983 df-uz 12245 df-fz 12894 df-hash 13692 |
This theorem is referenced by: esumcst 31322 sge0rpcpnf 42723 |
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