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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 9287. (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 14146 | . . . . . 6 ⊢ (𝑛 ∈ ℕ → (1...𝑛) ∈ Fin) | |
| 2 | ficardom 10072 | . . . . . 6 ⊢ ((1...𝑛) ∈ Fin → (card‘(1...𝑛)) ∈ ω) | |
| 3 | 1, 2 | syl 18 | . . . . 5 ⊢ (𝑛 ∈ ℕ → (card‘(1...𝑛)) ∈ ω) |
| 4 | isinf 9287 | . . . . 5 ⊢ (¬ 𝐴 ∈ Fin → ∀𝑎 ∈ ω ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎)) | |
| 5 | breq2 5110 | . . . . . . . 8 ⊢ (𝑎 = (card‘(1...𝑛)) → (𝑥 ≈ 𝑎 ↔ 𝑥 ≈ (card‘(1...𝑛)))) | |
| 6 | 5 | anbi2d 642 | . . . . . . 7 ⊢ (𝑎 = (card‘(1...𝑛)) → ((𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎) ↔ (𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛))))) |
| 7 | 6 | exbidv 1956 | . . . . . 6 ⊢ (𝑎 = (card‘(1...𝑛)) → (∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎) ↔ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛))))) |
| 8 | 7 | rspcva 3578 | . . . . 5 ⊢ (((card‘(1...𝑛)) ∈ ω ∧ ∀𝑎 ∈ ω ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎)) → ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛)))) |
| 9 | 3, 4, 8 | syl2anr 609 | . . . 4 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛)))) |
| 10 | velpw 4565 | . . . . . . . 8 ⊢ (𝑥 ∈ 𝒫 𝐴 ↔ 𝑥 ⊆ 𝐴) | |
| 11 | 10 | biimpri 231 | . . . . . . 7 ⊢ (𝑥 ⊆ 𝐴 → 𝑥 ∈ 𝒫 𝐴) |
| 12 | 11 | a1i 11 | . . . . . 6 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → (𝑥 ⊆ 𝐴 → 𝑥 ∈ 𝒫 𝐴)) |
| 13 | hasheni 14522 | . . . . . . . . 9 ⊢ (𝑥 ≈ (card‘(1...𝑛)) → (♯‘𝑥) = (♯‘(card‘(1...𝑛)))) | |
| 14 | 13 | adantl 487 | . . . . . . . 8 ⊢ (((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) ∧ 𝑥 ≈ (card‘(1...𝑛))) → (♯‘𝑥) = (♯‘(card‘(1...𝑛)))) |
| 15 | hashcard 14529 | . . . . . . . . . . 11 ⊢ ((1...𝑛) ∈ Fin → (♯‘(card‘(1...𝑛))) = (♯‘(1...𝑛))) | |
| 16 | 1, 15 | syl 18 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (♯‘(card‘(1...𝑛))) = (♯‘(1...𝑛))) |
| 17 | nnnn0 12643 | . . . . . . . . . . 11 ⊢ (𝑛 ∈ ℕ → 𝑛 ∈ ℕ0) | |
| 18 | hashfz1 14520 | . . . . . . . . . . 11 ⊢ (𝑛 ∈ ℕ0 → (♯‘(1...𝑛)) = 𝑛) | |
| 19 | 17, 18 | syl 18 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (♯‘(1...𝑛)) = 𝑛) |
| 20 | 16, 19 | eqtrd 2798 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℕ → (♯‘(card‘(1...𝑛))) = 𝑛) |
| 21 | 20 | ad2antlr 740 | . . . . . . . 8 ⊢ (((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) ∧ 𝑥 ≈ (card‘(1...𝑛))) → (♯‘(card‘(1...𝑛))) = 𝑛) |
| 22 | 14, 21 | eqtrd 2798 | . . . . . . 7 ⊢ (((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) ∧ 𝑥 ≈ (card‘(1...𝑛))) → (♯‘𝑥) = 𝑛) |
| 23 | 22 | ex 418 | . . . . . 6 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → (𝑥 ≈ (card‘(1...𝑛)) → (♯‘𝑥) = 𝑛)) |
| 24 | 12, 23 | anim12d 621 | . . . . 5 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → ((𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛))) → (𝑥 ∈ 𝒫 𝐴 ∧ (♯‘𝑥) = 𝑛))) |
| 25 | 24 | eximdv 1952 | . . . 4 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → (∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛))) → ∃𝑥(𝑥 ∈ 𝒫 𝐴 ∧ (♯‘𝑥) = 𝑛))) |
| 26 | 9, 25 | mpd 16 | . . 3 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → ∃𝑥(𝑥 ∈ 𝒫 𝐴 ∧ (♯‘𝑥) = 𝑛)) |
| 27 | df-rex 3091 | . . 3 ⊢ (∃𝑥 ∈ 𝒫 𝐴(♯‘𝑥) = 𝑛 ↔ ∃𝑥(𝑥 ∈ 𝒫 𝐴 ∧ (♯‘𝑥) = 𝑛)) | |
| 28 | 26, 27 | sylibr 237 | . 2 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → ∃𝑥 ∈ 𝒫 𝐴(♯‘𝑥) = 𝑛) |
| 29 | 28 | ralrimiva 3158 | 1 ⊢ (¬ 𝐴 ∈ Fin → ∀𝑛 ∈ ℕ ∃𝑥 ∈ 𝒫 𝐴(♯‘𝑥) = 𝑛) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 401 = wceq 1570 ∃wex 1812 ∈ wcel 2147 ∀wral 3080 ∃wrex 3090 ⊆ wss 3900 𝒫 cpw 4560 class class class wbr 5106 ‘cfv 6561 (class class class)co 7446 ωcom 7904 ≈ cen 9001 Fincfn 9004 cardccrd 10046 1c1 11231 ℕcn 12365 ℕ0cn0 12636 ...cfz 13669 ♯chash 14504 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5253 ax-nul 5264 ax-pow 5332 ax-pr 5396 ax-un 7778 ax-cnex 11286 ax-resscn 11287 ax-1cn 11288 ax-icn 11289 ax-addcl 11290 ax-addrcl 11291 ax-mulcl 11292 ax-mulrcl 11293 ax-mulcom 11294 ax-addass 11295 ax-mulass 11296 ax-distr 11297 ax-i2m1 11298 ax-1ne0 11299 ax-1rid 11300 ax-rnegex 11301 ax-rrecex 11302 ax-cnre 11303 ax-pre-lttri 11304 ax-pre-lttrn 11305 ax-pre-ltadd 11306 ax-pre-mulgt0 11307 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-int 4911 df-iun 4956 df-br 5107 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5551 df-eprel 5556 df-po 5564 df-so 5565 df-fr 5609 df-we 5611 df-xp 5662 df-rel 5663 df-cnv 5664 df-co 5665 df-dm 5666 df-rn 5667 df-res 5668 df-ima 5669 df-pred 6325 df-ord 6386 df-on 6387 df-lim 6388 df-suc 6389 df-iota 6515 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-riota 7403 df-ov 7449 df-oprab 7450 df-mpo 7451 df-om 7905 df-1st 8028 df-2nd 8029 df-frecs 8330 df-wrecs 8361 df-recs 8410 df-rdg 8449 df-1o 8507 df-er 8748 df-en 9005 df-dom 9006 df-sdom 9007 df-fin 9008 df-card 10050 df-pnf 11375 df-mnf 11376 df-xr 11377 df-ltxr 11378 df-le 11379 df-sub 11573 df-neg 11574 df-nn 12366 df-n0 12637 df-z 12724 df-uz 12996 df-fz 13670 df-hash 14505 |
| This theorem is used by: esumcst 34778 sge0rpcpnf 47646 |
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