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| Mirrors > Home > ILE Home > Th. List > unbendc | GIF version | ||
| Description: An unbounded decidable set of positive integers is infinite. (Contributed by NM, 5-May-2005.) (Revised by Jim Kingdon, 30-Sep-2024.) |
| Ref | Expression |
|---|---|
| unbendc | ⊢ ((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴 ∧ ∀𝑚 ∈ ℕ ∃𝑛 ∈ 𝐴 𝑚 < 𝑛) → 𝐴 ≈ ℕ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simpl1 1024 | . . . . . 6 ⊢ (((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴 ∧ ∀𝑚 ∈ ℕ ∃𝑛 ∈ 𝐴 𝑚 < 𝑛) ∧ (𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴)) → 𝐴 ⊆ ℕ) | |
| 2 | simprl 529 | . . . . . 6 ⊢ (((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴 ∧ ∀𝑚 ∈ ℕ ∃𝑛 ∈ 𝐴 𝑚 < 𝑛) ∧ (𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴)) → 𝑦 ∈ 𝐴) | |
| 3 | 1, 2 | sseldd 3225 | . . . . 5 ⊢ (((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴 ∧ ∀𝑚 ∈ ℕ ∃𝑛 ∈ 𝐴 𝑚 < 𝑛) ∧ (𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴)) → 𝑦 ∈ ℕ) |
| 4 | 3 | nnzd 9584 | . . . 4 ⊢ (((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴 ∧ ∀𝑚 ∈ ℕ ∃𝑛 ∈ 𝐴 𝑚 < 𝑛) ∧ (𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴)) → 𝑦 ∈ ℤ) |
| 5 | simprr 531 | . . . . . 6 ⊢ (((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴 ∧ ∀𝑚 ∈ ℕ ∃𝑛 ∈ 𝐴 𝑚 < 𝑛) ∧ (𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴)) → 𝑧 ∈ 𝐴) | |
| 6 | 1, 5 | sseldd 3225 | . . . . 5 ⊢ (((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴 ∧ ∀𝑚 ∈ ℕ ∃𝑛 ∈ 𝐴 𝑚 < 𝑛) ∧ (𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴)) → 𝑧 ∈ ℕ) |
| 7 | 6 | nnzd 9584 | . . . 4 ⊢ (((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴 ∧ ∀𝑚 ∈ ℕ ∃𝑛 ∈ 𝐴 𝑚 < 𝑛) ∧ (𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴)) → 𝑧 ∈ ℤ) |
| 8 | zdceq 9538 | . . . 4 ⊢ ((𝑦 ∈ ℤ ∧ 𝑧 ∈ ℤ) → DECID 𝑦 = 𝑧) | |
| 9 | 4, 7, 8 | syl2anc 411 | . . 3 ⊢ (((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴 ∧ ∀𝑚 ∈ ℕ ∃𝑛 ∈ 𝐴 𝑚 < 𝑛) ∧ (𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴)) → DECID 𝑦 = 𝑧) |
| 10 | 9 | ralrimivva 2612 | . 2 ⊢ ((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴 ∧ ∀𝑚 ∈ ℕ ∃𝑛 ∈ 𝐴 𝑚 < 𝑛) → ∀𝑦 ∈ 𝐴 ∀𝑧 ∈ 𝐴 DECID 𝑦 = 𝑧) |
| 11 | ssnnct 13039 | . . . 4 ⊢ ((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴) → ∃𝑤 𝑤:ω–onto→(𝐴 ⊔ 1o)) | |
| 12 | 11 | 3adant3 1041 | . . 3 ⊢ ((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴 ∧ ∀𝑚 ∈ ℕ ∃𝑛 ∈ 𝐴 𝑚 < 𝑛) → ∃𝑤 𝑤:ω–onto→(𝐴 ⊔ 1o)) |
| 13 | nninfdc 13045 | . . . 4 ⊢ ((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴 ∧ ∀𝑚 ∈ ℕ ∃𝑛 ∈ 𝐴 𝑚 < 𝑛) → ω ≼ 𝐴) | |
| 14 | infm 7082 | . . . 4 ⊢ (ω ≼ 𝐴 → ∃𝑞 𝑞 ∈ 𝐴) | |
| 15 | ctm 7292 | . . . 4 ⊢ (∃𝑞 𝑞 ∈ 𝐴 → (∃𝑤 𝑤:ω–onto→(𝐴 ⊔ 1o) ↔ ∃𝑤 𝑤:ω–onto→𝐴)) | |
| 16 | 13, 14, 15 | 3syl 17 | . . 3 ⊢ ((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴 ∧ ∀𝑚 ∈ ℕ ∃𝑛 ∈ 𝐴 𝑚 < 𝑛) → (∃𝑤 𝑤:ω–onto→(𝐴 ⊔ 1o) ↔ ∃𝑤 𝑤:ω–onto→𝐴)) |
| 17 | 12, 16 | mpbid 147 | . 2 ⊢ ((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴 ∧ ∀𝑚 ∈ ℕ ∃𝑛 ∈ 𝐴 𝑚 < 𝑛) → ∃𝑤 𝑤:ω–onto→𝐴) |
| 18 | ctinf 13022 | . 2 ⊢ (𝐴 ≈ ℕ ↔ (∀𝑦 ∈ 𝐴 ∀𝑧 ∈ 𝐴 DECID 𝑦 = 𝑧 ∧ ∃𝑤 𝑤:ω–onto→𝐴 ∧ ω ≼ 𝐴)) | |
| 19 | 10, 17, 13, 18 | syl3anbrc 1205 | 1 ⊢ ((𝐴 ⊆ ℕ ∧ ∀𝑥 ∈ ℕ DECID 𝑥 ∈ 𝐴 ∧ ∀𝑚 ∈ ℕ ∃𝑛 ∈ 𝐴 𝑚 < 𝑛) → 𝐴 ≈ ℕ) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 DECID wdc 839 ∧ w3a 1002 ∃wex 1538 ∈ wcel 2200 ∀wral 2508 ∃wrex 2509 ⊆ wss 3197 class class class wbr 4083 ωcom 4683 –onto→wfo 5319 1oc1o 6566 ≈ cen 6898 ≼ cdom 6899 ⊔ cdju 7220 < clt 8197 ℕcn 9126 ℤcz 9462 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-coll 4199 ax-sep 4202 ax-nul 4210 ax-pow 4259 ax-pr 4294 ax-un 4525 ax-setind 4630 ax-iinf 4681 ax-cnex 8106 ax-resscn 8107 ax-1cn 8108 ax-1re 8109 ax-icn 8110 ax-addcl 8111 ax-addrcl 8112 ax-mulcl 8113 ax-addcom 8115 ax-addass 8117 ax-distr 8119 ax-i2m1 8120 ax-0lt1 8121 ax-0id 8123 ax-rnegex 8124 ax-cnre 8126 ax-pre-ltirr 8127 ax-pre-ltwlin 8128 ax-pre-lttrn 8129 ax-pre-apti 8130 ax-pre-ltadd 8131 |
| This theorem depends on definitions: df-bi 117 df-dc 840 df-3or 1003 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-reu 2515 df-rmo 2516 df-rab 2517 df-v 2801 df-sbc 3029 df-csb 3125 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-if 3603 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-int 3924 df-iun 3967 df-br 4084 df-opab 4146 df-mpt 4147 df-tr 4183 df-id 4385 df-po 4388 df-iso 4389 df-iord 4458 df-on 4460 df-ilim 4461 df-suc 4463 df-iom 4684 df-xp 4726 df-rel 4727 df-cnv 4728 df-co 4729 df-dm 4730 df-rn 4731 df-res 4732 df-ima 4733 df-iota 5281 df-fun 5323 df-fn 5324 df-f 5325 df-f1 5326 df-fo 5327 df-f1o 5328 df-fv 5329 df-isom 5330 df-riota 5963 df-ov 6013 df-oprab 6014 df-mpo 6015 df-1st 6295 df-2nd 6296 df-recs 6462 df-frec 6548 df-1o 6573 df-er 6693 df-pm 6811 df-en 6901 df-dom 6902 df-fin 6903 df-sup 7167 df-inf 7168 df-dju 7221 df-inl 7230 df-inr 7231 df-case 7267 df-pnf 8199 df-mnf 8200 df-xr 8201 df-ltxr 8202 df-le 8203 df-sub 8335 df-neg 8336 df-inn 9127 df-n0 9386 df-z 9463 df-uz 9739 df-fz 10222 df-fzo 10356 df-seqfrec 10687 |
| This theorem is referenced by: prminf 13047 |
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