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| Mirrors > Home > MPE Home > Th. List > opnmbl | Structured version Visualization version GIF version | ||
| Description: All open sets are measurable. This proof, via dyadmbl 25724 and uniioombl 25713, shows that it is possible to avoid choice for measurability of open sets and hence continuous functions, which extends the choice-free consequences of Lebesgue measure considerably farther than would otherwise be possible. (Contributed by Mario Carneiro, 26-Mar-2015.) |
| Ref | Expression |
|---|---|
| opnmbl | ⊢ (𝐴 ∈ (topGen‘ran (,)) → 𝐴 ∈ dom vol) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | oveq1 7415 | . . . 4 ⊢ (𝑥 = 𝑧 → (𝑥 / (2↑𝑦)) = (𝑧 / (2↑𝑦))) | |
| 2 | oveq1 7415 | . . . . 5 ⊢ (𝑥 = 𝑧 → (𝑥 + 1) = (𝑧 + 1)) | |
| 3 | 2 | oveq1d 7423 | . . . 4 ⊢ (𝑥 = 𝑧 → ((𝑥 + 1) / (2↑𝑦)) = ((𝑧 + 1) / (2↑𝑦))) |
| 4 | 1, 3 | opeq12d 4847 | . . 3 ⊢ (𝑥 = 𝑧 → 〈(𝑥 / (2↑𝑦)), ((𝑥 + 1) / (2↑𝑦))〉 = 〈(𝑧 / (2↑𝑦)), ((𝑧 + 1) / (2↑𝑦))〉) |
| 5 | oveq2 7416 | . . . . 5 ⊢ (𝑦 = 𝑤 → (2↑𝑦) = (2↑𝑤)) | |
| 6 | 5 | oveq2d 7424 | . . . 4 ⊢ (𝑦 = 𝑤 → (𝑧 / (2↑𝑦)) = (𝑧 / (2↑𝑤))) |
| 7 | 5 | oveq2d 7424 | . . . 4 ⊢ (𝑦 = 𝑤 → ((𝑧 + 1) / (2↑𝑦)) = ((𝑧 + 1) / (2↑𝑤))) |
| 8 | 6, 7 | opeq12d 4847 | . . 3 ⊢ (𝑦 = 𝑤 → 〈(𝑧 / (2↑𝑦)), ((𝑧 + 1) / (2↑𝑦))〉 = 〈(𝑧 / (2↑𝑤)), ((𝑧 + 1) / (2↑𝑤))〉) |
| 9 | 4, 8 | cbvmpov 7503 | . 2 ⊢ (𝑥 ∈ ℤ, 𝑦 ∈ ℕ0 ↦ 〈(𝑥 / (2↑𝑦)), ((𝑥 + 1) / (2↑𝑦))〉) = (𝑧 ∈ ℤ, 𝑤 ∈ ℕ0 ↦ 〈(𝑧 / (2↑𝑤)), ((𝑧 + 1) / (2↑𝑤))〉) |
| 10 | 9 | opnmbllem 25725 | 1 ⊢ (𝐴 ∈ (topGen‘ran (,)) → 𝐴 ∈ dom vol) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2149 〈cop 4597 dom cdm 5659 ran crn 5660 ‘cfv 6533 (class class class)co 7408 ∈ cmpo 7410 1c1 11097 + caddc 11099 / cdiv 11867 2c2 12291 ℕ0cn0 12500 ℤcz 12587 (,)cioo 13368 ↑cexp 14093 topGenctg 17486 volcvol 25587 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-rep 5239 ax-sep 5258 ax-nul 5268 ax-pow 5334 ax-pr 5402 ax-un 7730 ax-inf2 9606 ax-cnex 11152 ax-resscn 11153 ax-1cn 11154 ax-icn 11155 ax-addcl 11156 ax-addrcl 11157 ax-mulcl 11158 ax-mulrcl 11159 ax-mulcom 11160 ax-addass 11161 ax-mulass 11162 ax-distr 11163 ax-i2m1 11164 ax-1ne0 11165 ax-1rid 11166 ax-rnegex 11167 ax-rrecex 11168 ax-cnre 11169 ax-pre-lttri 11170 ax-pre-lttrn 11171 ax-pre-ltadd 11172 ax-pre-mulgt0 11173 ax-pre-sup 11174 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-rmo 3376 df-reu 3377 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-pss 3933 df-nul 4295 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4874 df-int 4914 df-iun 4959 df-disj 5078 df-br 5111 df-opab 5175 df-mpt 5194 df-tr 5220 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-se 5613 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-isom 6542 df-riota 7365 df-ov 7411 df-oprab 7412 df-mpo 7413 df-of 7672 df-om 7859 df-1st 7982 df-2nd 7983 df-frecs 8274 df-wrecs 8305 df-recs 8354 df-rdg 8393 df-1o 8449 df-2o 8450 df-oadd 8453 df-omul 8454 df-er 8690 df-map 8822 df-pm 8823 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-fi 9367 df-sup 9398 df-inf 9399 df-oi 9468 df-dju 9883 df-card 9921 df-acn 9924 df-pnf 11241 df-mnf 11242 df-xr 11243 df-ltxr 11244 df-le 11245 df-sub 11439 df-neg 11440 df-div 11868 df-nn 12230 df-2 12299 df-3 12300 df-4 12301 df-n0 12501 df-z 12588 df-uz 12859 df-q 12969 df-rp 13013 df-xneg 13133 df-xadd 13134 df-xmul 13135 df-ioo 13372 df-ico 13374 df-icc 13375 df-fz 13532 df-fzo 13679 df-fl 13821 df-seq 14034 df-exp 14094 df-hash 14363 df-cj 15146 df-re 15147 df-im 15148 df-sqrt 15282 df-abs 15283 df-clim 15535 df-rlim 15536 df-sum 15734 df-rest 17471 df-topgen 17492 df-psmet 21479 df-xmet 21480 df-met 21481 df-bl 21482 df-mopn 21483 df-top 23016 df-topon 23033 df-bases 23068 df-cmp 23509 df-ovol 25588 df-vol 25589 |
| This theorem is referenced by: subopnmbl 25728 mblfinlem3 38193 mblfinlem4 38194 ismblfin 38195 |
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