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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 9205. (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 13983 | . . . . . 6 ⊢ (𝑛 ∈ ℕ → (1...𝑛) ∈ Fin) | |
| 2 | ficardom 9916 | . . . . . 6 ⊢ ((1...𝑛) ∈ Fin → (card‘(1...𝑛)) ∈ ω) | |
| 3 | 1, 2 | syl 17 | . . . . 5 ⊢ (𝑛 ∈ ℕ → (card‘(1...𝑛)) ∈ ω) |
| 4 | isinf 9205 | . . . . 5 ⊢ (¬ 𝐴 ∈ Fin → ∀𝑎 ∈ ω ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎)) | |
| 5 | breq2 5103 | . . . . . . . 8 ⊢ (𝑎 = (card‘(1...𝑛)) → (𝑥 ≈ 𝑎 ↔ 𝑥 ≈ (card‘(1...𝑛)))) | |
| 6 | 5 | anbi2d 639 | . . . . . . 7 ⊢ (𝑎 = (card‘(1...𝑛)) → ((𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎) ↔ (𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛))))) |
| 7 | 6 | exbidv 1940 | . . . . . 6 ⊢ (𝑎 = (card‘(1...𝑛)) → (∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎) ↔ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛))))) |
| 8 | 7 | rspcva 3579 | . . . . 5 ⊢ (((card‘(1...𝑛)) ∈ ω ∧ ∀𝑎 ∈ ω ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ 𝑎)) → ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛)))) |
| 9 | 3, 4, 8 | syl2anr 606 | . . . 4 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛)))) |
| 10 | velpw 4559 | . . . . . . . 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 14358 | . . . . . . . . 9 ⊢ (𝑥 ≈ (card‘(1...𝑛)) → (♯‘𝑥) = (♯‘(card‘(1...𝑛)))) | |
| 14 | 13 | adantl 485 | . . . . . . . 8 ⊢ (((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) ∧ 𝑥 ≈ (card‘(1...𝑛))) → (♯‘𝑥) = (♯‘(card‘(1...𝑛)))) |
| 15 | hashcard 14365 | . . . . . . . . . . 11 ⊢ ((1...𝑛) ∈ Fin → (♯‘(card‘(1...𝑛))) = (♯‘(1...𝑛))) | |
| 16 | 1, 15 | syl 17 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (♯‘(card‘(1...𝑛))) = (♯‘(1...𝑛))) |
| 17 | nnnn0 12485 | . . . . . . . . . . 11 ⊢ (𝑛 ∈ ℕ → 𝑛 ∈ ℕ0) | |
| 18 | hashfz1 14356 | . . . . . . . . . . 11 ⊢ (𝑛 ∈ ℕ0 → (♯‘(1...𝑛)) = 𝑛) | |
| 19 | 17, 18 | syl 17 | . . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (♯‘(1...𝑛)) = 𝑛) |
| 20 | 16, 19 | eqtrd 2796 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℕ → (♯‘(card‘(1...𝑛))) = 𝑛) |
| 21 | 20 | ad2antlr 737 | . . . . . . . 8 ⊢ (((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) ∧ 𝑥 ≈ (card‘(1...𝑛))) → (♯‘(card‘(1...𝑛))) = 𝑛) |
| 22 | 14, 21 | eqtrd 2796 | . . . . . . 7 ⊢ (((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) ∧ 𝑥 ≈ (card‘(1...𝑛))) → (♯‘𝑥) = 𝑛) |
| 23 | 22 | ex 416 | . . . . . 6 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → (𝑥 ≈ (card‘(1...𝑛)) → (♯‘𝑥) = 𝑛)) |
| 24 | 12, 23 | anim12d 618 | . . . . 5 ⊢ ((¬ 𝐴 ∈ Fin ∧ 𝑛 ∈ ℕ) → ((𝑥 ⊆ 𝐴 ∧ 𝑥 ≈ (card‘(1...𝑛))) → (𝑥 ∈ 𝒫 𝐴 ∧ (♯‘𝑥) = 𝑛))) |
| 25 | 24 | eximdv 1936 | . . . 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 3086 | . . 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 3153 | 1 ⊢ (¬ 𝐴 ∈ Fin → ∀𝑛 ∈ ℕ ∃𝑥 ∈ 𝒫 𝐴(♯‘𝑥) = 𝑛) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 399 = wceq 1559 ∃wex 1798 ∈ wcel 2141 ∀wral 3075 ∃wrex 3085 ⊆ wss 3904 𝒫 cpw 4554 class class class wbr 5099 ‘cfv 6517 (class class class)co 7392 ωcom 7842 ≈ cen 8920 Fincfn 8923 cardccrd 9890 1c1 11071 ℕcn 12207 ℕ0cn0 12478 ...cfz 13509 ♯chash 14340 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-sep 5245 ax-nul 5255 ax-pow 5321 ax-pr 5389 ax-un 7714 ax-cnex 11126 ax-resscn 11127 ax-1cn 11128 ax-icn 11129 ax-addcl 11130 ax-addrcl 11131 ax-mulcl 11132 ax-mulrcl 11133 ax-mulcom 11134 ax-addass 11135 ax-mulass 11136 ax-distr 11137 ax-i2m1 11138 ax-1ne0 11139 ax-1rid 11140 ax-rnegex 11141 ax-rrecex 11142 ax-cnre 11143 ax-pre-lttri 11144 ax-pre-lttrn 11145 ax-pre-ltadd 11146 ax-pre-mulgt0 11147 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3061 df-ral 3076 df-rex 3086 df-reu 3367 df-rab 3414 df-v 3455 df-sbc 3745 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4582 df-pr 4584 df-op 4588 df-uni 4865 df-int 4905 df-iun 4950 df-br 5100 df-opab 5162 df-mpt 5181 df-tr 5207 df-id 5540 df-eprel 5545 df-po 5553 df-so 5554 df-fr 5598 df-we 5600 df-xp 5651 df-rel 5652 df-cnv 5653 df-co 5654 df-dm 5655 df-rn 5656 df-res 5657 df-ima 5658 df-pred 6284 df-ord 6345 df-on 6346 df-lim 6347 df-suc 6348 df-iota 6473 df-fun 6519 df-fn 6520 df-f 6521 df-f1 6522 df-fo 6523 df-f1o 6524 df-fv 6525 df-riota 7349 df-ov 7395 df-oprab 7396 df-mpo 7397 df-om 7843 df-1st 7966 df-2nd 7967 df-frecs 8257 df-wrecs 8288 df-recs 8337 df-rdg 8376 df-1o 8432 df-er 8673 df-en 8924 df-dom 8925 df-sdom 8926 df-fin 8927 df-card 9894 df-pnf 11215 df-mnf 11216 df-xr 11217 df-ltxr 11218 df-le 11219 df-sub 11413 df-neg 11414 df-nn 12208 df-n0 12479 df-z 12566 df-uz 12837 df-fz 13510 df-hash 14341 |
| This theorem is referenced by: esumcst 34321 sge0rpcpnf 46959 |
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