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| Mirrors > Home > ILE Home > Th. List > Mathboxes > nconstwlpo | GIF version | ||
| Description: Existence of a certain non-constant function from reals to integers implies ω ∈ WOmni (the Weak Limited Principle of Omniscience or WLPO). Based on Exercise 11.6(ii) of [HoTT], p. (varies). (Contributed by BJ and Jim Kingdon, 22-Jul-2024.) |
| Ref | Expression |
|---|---|
| nconstwlpo.f | ⊢ (𝜑 → 𝐹:ℝ⟶ℤ) |
| nconstwlpo.0 | ⊢ (𝜑 → (𝐹‘0) = 0) |
| nconstwlpo.rp | ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ+) → (𝐹‘𝑥) ≠ 0) |
| Ref | Expression |
|---|---|
| nconstwlpo | ⊢ (𝜑 → ω ∈ WOmni) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nconstwlpo.f | . . . . . . 7 ⊢ (𝜑 → 𝐹:ℝ⟶ℤ) | |
| 2 | 1 | adantr 276 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑔 ∈ ({0, 1} ↑𝑚 ℕ)) → 𝐹:ℝ⟶ℤ) |
| 3 | nconstwlpo.0 | . . . . . . 7 ⊢ (𝜑 → (𝐹‘0) = 0) | |
| 4 | 3 | adantr 276 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑔 ∈ ({0, 1} ↑𝑚 ℕ)) → (𝐹‘0) = 0) |
| 5 | nconstwlpo.rp | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ+) → (𝐹‘𝑥) ≠ 0) | |
| 6 | 5 | adantlr 477 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑔 ∈ ({0, 1} ↑𝑚 ℕ)) ∧ 𝑥 ∈ ℝ+) → (𝐹‘𝑥) ≠ 0) |
| 7 | elmapi 6767 | . . . . . . 7 ⊢ (𝑔 ∈ ({0, 1} ↑𝑚 ℕ) → 𝑔:ℕ⟶{0, 1}) | |
| 8 | 7 | adantl 277 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑔 ∈ ({0, 1} ↑𝑚 ℕ)) → 𝑔:ℕ⟶{0, 1}) |
| 9 | oveq2 5962 | . . . . . . . . 9 ⊢ (𝑖 = 𝑗 → (2↑𝑖) = (2↑𝑗)) | |
| 10 | 9 | oveq2d 5970 | . . . . . . . 8 ⊢ (𝑖 = 𝑗 → (1 / (2↑𝑖)) = (1 / (2↑𝑗))) |
| 11 | fveq2 5586 | . . . . . . . 8 ⊢ (𝑖 = 𝑗 → (𝑔‘𝑖) = (𝑔‘𝑗)) | |
| 12 | 10, 11 | oveq12d 5972 | . . . . . . 7 ⊢ (𝑖 = 𝑗 → ((1 / (2↑𝑖)) · (𝑔‘𝑖)) = ((1 / (2↑𝑗)) · (𝑔‘𝑗))) |
| 13 | 12 | cbvsumv 11722 | . . . . . 6 ⊢ Σ𝑖 ∈ ℕ ((1 / (2↑𝑖)) · (𝑔‘𝑖)) = Σ𝑗 ∈ ℕ ((1 / (2↑𝑗)) · (𝑔‘𝑗)) |
| 14 | 2, 4, 6, 8, 13 | nconstwlpolem 16119 | . . . . 5 ⊢ ((𝜑 ∧ 𝑔 ∈ ({0, 1} ↑𝑚 ℕ)) → (∀𝑦 ∈ ℕ (𝑔‘𝑦) = 0 ∨ ¬ ∀𝑦 ∈ ℕ (𝑔‘𝑦) = 0)) |
| 15 | df-dc 837 | . . . . 5 ⊢ (DECID ∀𝑦 ∈ ℕ (𝑔‘𝑦) = 0 ↔ (∀𝑦 ∈ ℕ (𝑔‘𝑦) = 0 ∨ ¬ ∀𝑦 ∈ ℕ (𝑔‘𝑦) = 0)) | |
| 16 | 14, 15 | sylibr 134 | . . . 4 ⊢ ((𝜑 ∧ 𝑔 ∈ ({0, 1} ↑𝑚 ℕ)) → DECID ∀𝑦 ∈ ℕ (𝑔‘𝑦) = 0) |
| 17 | 16 | ralrimiva 2580 | . . 3 ⊢ (𝜑 → ∀𝑔 ∈ ({0, 1} ↑𝑚 ℕ)DECID ∀𝑦 ∈ ℕ (𝑔‘𝑦) = 0) |
| 18 | nnex 9055 | . . . 4 ⊢ ℕ ∈ V | |
| 19 | iswomni0 16105 | . . . 4 ⊢ (ℕ ∈ V → (ℕ ∈ WOmni ↔ ∀𝑔 ∈ ({0, 1} ↑𝑚 ℕ)DECID ∀𝑦 ∈ ℕ (𝑔‘𝑦) = 0)) | |
| 20 | 18, 19 | ax-mp 5 | . . 3 ⊢ (ℕ ∈ WOmni ↔ ∀𝑔 ∈ ({0, 1} ↑𝑚 ℕ)DECID ∀𝑦 ∈ ℕ (𝑔‘𝑦) = 0) |
| 21 | 17, 20 | sylibr 134 | . 2 ⊢ (𝜑 → ℕ ∈ WOmni) |
| 22 | nnenom 10592 | . . 3 ⊢ ℕ ≈ ω | |
| 23 | enwomni 7284 | . . 3 ⊢ (ℕ ≈ ω → (ℕ ∈ WOmni ↔ ω ∈ WOmni)) | |
| 24 | 22, 23 | ax-mp 5 | . 2 ⊢ (ℕ ∈ WOmni ↔ ω ∈ WOmni) |
| 25 | 21, 24 | sylib 122 | 1 ⊢ (𝜑 → ω ∈ WOmni) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 ↔ wb 105 ∨ wo 710 DECID wdc 836 = wceq 1373 ∈ wcel 2177 ≠ wne 2377 ∀wral 2485 Vcvv 2773 {cpr 3636 class class class wbr 4048 ωcom 4643 ⟶wf 5273 ‘cfv 5277 (class class class)co 5954 ↑𝑚 cmap 6745 ≈ cen 6835 WOmnicwomni 7277 ℝcr 7937 0cc0 7938 1c1 7939 · cmul 7943 / cdiv 8758 ℕcn 9049 2c2 9100 ℤcz 9385 ℝ+crp 9788 ↑cexp 10696 Σcsu 11714 |
| 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 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2179 ax-14 2180 ax-ext 2188 ax-coll 4164 ax-sep 4167 ax-nul 4175 ax-pow 4223 ax-pr 4258 ax-un 4485 ax-setind 4590 ax-iinf 4641 ax-cnex 8029 ax-resscn 8030 ax-1cn 8031 ax-1re 8032 ax-icn 8033 ax-addcl 8034 ax-addrcl 8035 ax-mulcl 8036 ax-mulrcl 8037 ax-addcom 8038 ax-mulcom 8039 ax-addass 8040 ax-mulass 8041 ax-distr 8042 ax-i2m1 8043 ax-0lt1 8044 ax-1rid 8045 ax-0id 8046 ax-rnegex 8047 ax-precex 8048 ax-cnre 8049 ax-pre-ltirr 8050 ax-pre-ltwlin 8051 ax-pre-lttrn 8052 ax-pre-apti 8053 ax-pre-ltadd 8054 ax-pre-mulgt0 8055 ax-pre-mulext 8056 ax-arch 8057 ax-caucvg 8058 |
| This theorem depends on definitions: df-bi 117 df-dc 837 df-3or 982 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ne 2378 df-nel 2473 df-ral 2490 df-rex 2491 df-reu 2492 df-rmo 2493 df-rab 2494 df-v 2775 df-sbc 3001 df-csb 3096 df-dif 3170 df-un 3172 df-in 3174 df-ss 3181 df-nul 3463 df-if 3574 df-pw 3620 df-sn 3641 df-pr 3642 df-op 3644 df-uni 3854 df-int 3889 df-iun 3932 df-br 4049 df-opab 4111 df-mpt 4112 df-tr 4148 df-id 4345 df-po 4348 df-iso 4349 df-iord 4418 df-on 4420 df-ilim 4421 df-suc 4423 df-iom 4644 df-xp 4686 df-rel 4687 df-cnv 4688 df-co 4689 df-dm 4690 df-rn 4691 df-res 4692 df-ima 4693 df-iota 5238 df-fun 5279 df-fn 5280 df-f 5281 df-f1 5282 df-fo 5283 df-f1o 5284 df-fv 5285 df-isom 5286 df-riota 5909 df-ov 5957 df-oprab 5958 df-mpo 5959 df-1st 6236 df-2nd 6237 df-recs 6401 df-irdg 6466 df-frec 6487 df-1o 6512 df-2o 6513 df-oadd 6516 df-er 6630 df-map 6747 df-en 6838 df-dom 6839 df-fin 6840 df-womni 7278 df-pnf 8122 df-mnf 8123 df-xr 8124 df-ltxr 8125 df-le 8126 df-sub 8258 df-neg 8259 df-reap 8661 df-ap 8668 df-div 8759 df-inn 9050 df-2 9108 df-3 9109 df-4 9110 df-n0 9309 df-z 9386 df-uz 9662 df-q 9754 df-rp 9789 df-ico 10029 df-fz 10144 df-fzo 10278 df-seqfrec 10606 df-exp 10697 df-ihash 10934 df-cj 11203 df-re 11204 df-im 11205 df-rsqrt 11359 df-abs 11360 df-clim 11640 df-sumdc 11715 |
| This theorem is referenced by: (None) |
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