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| Mirrors > Home > ILE Home > Th. List > sumdc | GIF version | ||
| Description: Decidability of a subset of upper integers. (Contributed by Jim Kingdon, 1-Jan-2022.) |
| Ref | Expression |
|---|---|
| sumdc.m | ⊢ (𝜑 → 𝑀 ∈ ℤ) |
| sumdc.ss | ⊢ (𝜑 → 𝐴 ⊆ (ℤ≥‘𝑀)) |
| sumdc.dc | ⊢ (𝜑 → ∀𝑥 ∈ (ℤ≥‘𝑀)DECID 𝑥 ∈ 𝐴) |
| sumdc.n | ⊢ (𝜑 → 𝑁 ∈ ℤ) |
| Ref | Expression |
|---|---|
| sumdc | ⊢ (𝜑 → DECID 𝑁 ∈ 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sumdc.dc | . . 3 ⊢ (𝜑 → ∀𝑥 ∈ (ℤ≥‘𝑀)DECID 𝑥 ∈ 𝐴) | |
| 2 | eleq1 2301 | . . . . 5 ⊢ (𝑥 = 𝑁 → (𝑥 ∈ 𝐴 ↔ 𝑁 ∈ 𝐴)) | |
| 3 | 2 | dcbid 850 | . . . 4 ⊢ (𝑥 = 𝑁 → (DECID 𝑥 ∈ 𝐴 ↔ DECID 𝑁 ∈ 𝐴)) |
| 4 | 3 | rspcv 2925 | . . 3 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → (∀𝑥 ∈ (ℤ≥‘𝑀)DECID 𝑥 ∈ 𝐴 → DECID 𝑁 ∈ 𝐴)) |
| 5 | 1, 4 | mpan9 281 | . 2 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → DECID 𝑁 ∈ 𝐴) |
| 6 | sumdc.ss | . . . . . 6 ⊢ (𝜑 → 𝐴 ⊆ (ℤ≥‘𝑀)) | |
| 7 | 6 | ssneld 3250 | . . . . 5 ⊢ (𝜑 → (¬ 𝑁 ∈ (ℤ≥‘𝑀) → ¬ 𝑁 ∈ 𝐴)) |
| 8 | 7 | imp 124 | . . . 4 ⊢ ((𝜑 ∧ ¬ 𝑁 ∈ (ℤ≥‘𝑀)) → ¬ 𝑁 ∈ 𝐴) |
| 9 | 8 | olcd 746 | . . 3 ⊢ ((𝜑 ∧ ¬ 𝑁 ∈ (ℤ≥‘𝑀)) → (𝑁 ∈ 𝐴 ∨ ¬ 𝑁 ∈ 𝐴)) |
| 10 | df-dc 847 | . . 3 ⊢ (DECID 𝑁 ∈ 𝐴 ↔ (𝑁 ∈ 𝐴 ∨ ¬ 𝑁 ∈ 𝐴)) | |
| 11 | 9, 10 | sylibr 134 | . 2 ⊢ ((𝜑 ∧ ¬ 𝑁 ∈ (ℤ≥‘𝑀)) → DECID 𝑁 ∈ 𝐴) |
| 12 | sumdc.m | . . . 4 ⊢ (𝜑 → 𝑀 ∈ ℤ) | |
| 13 | sumdc.n | . . . 4 ⊢ (𝜑 → 𝑁 ∈ ℤ) | |
| 14 | eluzdc 10012 | . . . 4 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID 𝑁 ∈ (ℤ≥‘𝑀)) | |
| 15 | 12, 13, 14 | syl2anc 415 | . . 3 ⊢ (𝜑 → DECID 𝑁 ∈ (ℤ≥‘𝑀)) |
| 16 | exmiddc 848 | . . 3 ⊢ (DECID 𝑁 ∈ (ℤ≥‘𝑀) → (𝑁 ∈ (ℤ≥‘𝑀) ∨ ¬ 𝑁 ∈ (ℤ≥‘𝑀))) | |
| 17 | 15, 16 | syl 14 | . 2 ⊢ (𝜑 → (𝑁 ∈ (ℤ≥‘𝑀) ∨ ¬ 𝑁 ∈ (ℤ≥‘𝑀))) |
| 18 | 5, 11, 17 | mpjaodan 810 | 1 ⊢ (𝜑 → DECID 𝑁 ∈ 𝐴) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 104 ∨ wo 720 DECID wdc 846 = wceq 1402 ∈ wcel 2209 ∀wral 2528 ⊆ wss 3220 ‘cfv 5377 ℤcz 9646 ℤ≥cuz 9923 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4249 ax-pow 4311 ax-pr 4346 ax-un 4578 ax-setind 4684 ax-cnex 8270 ax-resscn 8271 ax-1cn 8272 ax-1re 8273 ax-icn 8274 ax-addcl 8275 ax-addrcl 8276 ax-mulcl 8277 ax-addcom 8279 ax-addass 8281 ax-distr 8283 ax-i2m1 8284 ax-0lt1 8285 ax-0id 8287 ax-rnegex 8288 ax-cnre 8290 ax-pre-ltirr 8291 ax-pre-ltwlin 8292 ax-pre-lttrn 8293 ax-pre-ltadd 8295 |
| This proof depends on definitions: df-bi 117 df-dc 847 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-br 4131 df-opab 4193 df-mpt 4194 df-id 4438 df-xp 4780 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-iota 5337 df-fun 5379 df-fv 5385 df-riota 6038 df-ov 6088 df-oprab 6089 df-mpo 6090 df-pnf 8362 df-mnf 8363 df-xr 8364 df-ltxr 8365 df-le 8366 df-sub 8499 df-neg 8500 df-inn 9306 df-n0 9566 df-z 9647 df-uz 9924 |
| This theorem is used by: sumeq2 12127 prodeq2 12326 |
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