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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 9239. (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 14041 | . . . . . 6 ⊢ (𝑛 ∈ ℕ → (1...𝑛) ∈ Fin) | |
| 2 | ficardom 9970 | . . . . . 6 ⊢ ((1...𝑛) ∈ Fin → (card‘(1...𝑛)) ∈ ω) | |
| 3 | 1, 2 | syl 18 | . . . . 5 ⊢ (𝑛 ∈ ℕ → (card‘(1...𝑛)) ∈ ω) |
| 4 | isinf 9239 | . . . . 5 ⊢ (¬ 𝐴 ∈ Fin → ∀𝑎 ∈ ω ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎)) | |
| 5 | breq2 5111 | . . . . . . . 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 1954 | . . . . . 6 ⊢ (𝑎 = (card‘(1...𝑛)) → (∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎) ↔ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛))))) |
| 8 | 7 | rspcva 3577 | . . . . 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 14416 | . . . . . . . . 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 14423 | . . . . . . . . . . 11 ⊢ ((1...𝑛) ∈ Fin → (♯‘(card‘(1...𝑛))) = (♯‘(1...𝑛))) | |
| 16 | 1, 15 | syl 18 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (♯‘(card‘(1...𝑛))) = (♯‘(1...𝑛))) |
| 17 | nnnn0 12539 | . . . . . . . . . . 11 ⊢ (𝑛 ∈ ℕ → 𝑛 ∈ ℕ0) | |
| 18 | hashfz1 14414 | . . . . . . . . . . 11 ⊢ (𝑛 ∈ ℕ0 → (♯‘(1...𝑛)) = 𝑛) | |
| 19 | 17, 18 | syl 18 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (♯‘(1...𝑛)) = 𝑛) |
| 20 | 16, 19 | eqtrd 2797 | . . . . . . . . 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 2797 | . . . . . . 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 1950 | . . . 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 3089 | . . 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 3156 | 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 2145 ∀wral 3078 ∃wrex 3088 ⊆ wss 3902 𝒫 cpw 4560 class class class wbr 5107 ‘cfv 6537 (class class class)co 7417 ωcom 7866 ≈ cen 8953 Fincfn 8956 cardccrd 9944 1c1 11129 ℕcn 12261 ℕ0cn0 12532 ...cfz 13565 ♯chash 14398 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7740 ax-cnex 11184 ax-resscn 11185 ax-1cn 11186 ax-icn 11187 ax-addcl 11188 ax-addrcl 11189 ax-mulcl 11190 ax-mulrcl 11191 ax-mulcom 11192 ax-addass 11193 ax-mulass 11194 ax-distr 11195 ax-i2m1 11196 ax-1ne0 11197 ax-1rid 11198 ax-rnegex 11199 ax-rrecex 11200 ax-cnre 11201 ax-pre-lttri 11202 ax-pre-lttrn 11203 ax-pre-ltadd 11204 ax-pre-mulgt0 11205 |
| 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 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-int 4911 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7374 df-ov 7420 df-oprab 7421 df-mpo 7422 df-om 7867 df-1st 7990 df-2nd 7991 df-frecs 8284 df-wrecs 8315 df-recs 8364 df-rdg 8403 df-1o 8459 df-er 8700 df-en 8957 df-dom 8958 df-sdom 8959 df-fin 8960 df-card 9948 df-pnf 11273 df-mnf 11274 df-xr 11275 df-ltxr 11276 df-le 11277 df-sub 11471 df-neg 11472 df-nn 12262 df-n0 12533 df-z 12620 df-uz 12892 df-fz 13566 df-hash 14399 |
| This theorem is used by: esumcst 34581 sge0rpcpnf 47257 |
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