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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 6903 | . . . . . . 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 6057 | . . . . . . . . 9 ⊢ (𝑖 = 𝑗 → (2↑𝑖) = (2↑𝑗)) | |
| 10 | 9 | oveq2d 6065 | . . . . . . . 8 ⊢ (𝑖 = 𝑗 → (1 / (2↑𝑖)) = (1 / (2↑𝑗))) |
| 11 | fveq2 5669 | . . . . . . . 8 ⊢ (𝑖 = 𝑗 → (𝑔‘𝑖) = (𝑔‘𝑗)) | |
| 12 | 10, 11 | oveq12d 6067 | . . . . . . 7 ⊢ (𝑖 = 𝑗 → ((1 / (2↑𝑖)) · (𝑔‘𝑖)) = ((1 / (2↑𝑗)) · (𝑔‘𝑗))) |
| 13 | 12 | cbvsumv 12042 | . . . . . 6 ⊢ Σ𝑖 ∈ ℕ ((1 / (2↑𝑖)) · (𝑔‘𝑖)) = Σ𝑗 ∈ ℕ ((1 / (2↑𝑗)) · (𝑔‘𝑗)) |
| 14 | 2, 4, 6, 8, 13 | nconstwlpolem 16842 | . . . . 5 ⊢ ((𝜑 ∧ 𝑔 ∈ ({0, 1} ↑𝑚 ℕ)) → (∀𝑦 ∈ ℕ (𝑔‘𝑦) = 0 ∨ ¬ ∀𝑦 ∈ ℕ (𝑔‘𝑦) = 0)) |
| 15 | df-dc 843 | . . . . 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 2615 | . . 3 ⊢ (𝜑 → ∀𝑔 ∈ ({0, 1} ↑𝑚 ℕ)DECID ∀𝑦 ∈ ℕ (𝑔‘𝑦) = 0) |
| 18 | nnex 9242 | . . . 4 ⊢ ℕ ∈ V | |
| 19 | iswomni0 16828 | . . . 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 10795 | . . 3 ⊢ ℕ ≈ ω | |
| 23 | enwomni 7460 | . . 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 716 DECID wdc 842 = wceq 1398 ∈ wcel 2203 ≠ wne 2412 ∀wral 2520 Vcvv 2812 {cpr 3689 class class class wbr 4108 ωcom 4711 ⟶wf 5347 ‘cfv 5351 (class class class)co 6049 ↑𝑚 cmap 6881 ≈ cen 6972 WOmnicwomni 7453 ℝcr 8125 0cc0 8126 1c1 8127 · cmul 8131 / cdiv 8945 ℕcn 9236 2c2 9287 ℤcz 9576 ℝ+crp 9985 ↑cexp 10899 Σcsu 12034 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2205 ax-14 2206 ax-ext 2214 ax-coll 4224 ax-sep 4227 ax-nul 4235 ax-pow 4286 ax-pr 4321 ax-un 4553 ax-setind 4658 ax-iinf 4709 ax-cnex 8217 ax-resscn 8218 ax-1cn 8219 ax-1re 8220 ax-icn 8221 ax-addcl 8222 ax-addrcl 8223 ax-mulcl 8224 ax-mulrcl 8225 ax-addcom 8226 ax-mulcom 8227 ax-addass 8228 ax-mulass 8229 ax-distr 8230 ax-i2m1 8231 ax-0lt1 8232 ax-1rid 8233 ax-0id 8234 ax-rnegex 8235 ax-precex 8236 ax-cnre 8237 ax-pre-ltirr 8238 ax-pre-ltwlin 8239 ax-pre-lttrn 8240 ax-pre-apti 8241 ax-pre-ltadd 8242 ax-pre-mulgt0 8243 ax-pre-mulext 8244 ax-arch 8245 ax-caucvg 8246 |
| This theorem depends on definitions: df-bi 117 df-dc 843 df-3or 1006 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2083 df-mo 2084 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ne 2413 df-nel 2508 df-ral 2525 df-rex 2526 df-reu 2527 df-rmo 2528 df-rab 2529 df-v 2814 df-sbc 3042 df-csb 3138 df-dif 3212 df-un 3214 df-in 3216 df-ss 3223 df-nul 3508 df-if 3620 df-pw 3670 df-sn 3694 df-pr 3695 df-op 3697 df-uni 3914 df-int 3949 df-iun 3992 df-br 4109 df-opab 4171 df-mpt 4172 df-tr 4208 df-id 4413 df-po 4416 df-iso 4417 df-iord 4486 df-on 4488 df-ilim 4489 df-suc 4491 df-iom 4712 df-xp 4754 df-rel 4755 df-cnv 4756 df-co 4757 df-dm 4758 df-rn 4759 df-res 4760 df-ima 4761 df-iota 5311 df-fun 5353 df-fn 5354 df-f 5355 df-f1 5356 df-fo 5357 df-f1o 5358 df-fv 5359 df-isom 5360 df-riota 6002 df-ov 6052 df-oprab 6053 df-mpo 6054 df-1st 6333 df-2nd 6334 df-recs 6535 df-irdg 6600 df-frec 6621 df-1o 6646 df-2o 6647 df-oadd 6650 df-er 6766 df-map 6883 df-en 6975 df-dom 6976 df-fin 6977 df-womni 7454 df-pnf 8309 df-mnf 8310 df-xr 8311 df-ltxr 8312 df-le 8313 df-sub 8445 df-neg 8446 df-reap 8848 df-ap 8855 df-div 8946 df-inn 9237 df-2 9295 df-3 9296 df-4 9297 df-n0 9496 df-z 9577 df-uz 9853 df-q 9951 df-rp 9986 df-ico 10226 df-fz 10342 df-fzo 10476 df-seqfrec 10809 df-exp 10900 df-ihash 11137 df-cj 11523 df-re 11524 df-im 11525 df-rsqrt 11679 df-abs 11680 df-clim 11960 df-sumdc 12035 |
| This theorem is referenced by: (None) |
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