carsgsiga - Mathbox for Thierry Arnoux

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Theorem carsgsiga 34460

Description: The Caratheodory measurable sets constructed from outer measures form a Sigma-algebra. Statement (iii) of Theorem 1.11.4 of [Bogachev] p. 42. (Contributed by Thierry Arnoux, 17-May-2020.)

**Hypotheses**
Ref	Expression
carsgval.1	⊢ (𝜑 → 𝑂 ∈ 𝑉)
carsgval.2	⊢ (𝜑 → 𝑀:𝒫 𝑂⟶(0[,]+∞))
carsgsiga.1	⊢ (𝜑 → (𝑀‘∅) = 0)
carsgsiga.2	⊢ ((𝜑 ∧ 𝑥 ≼ ω ∧ 𝑥 ⊆ 𝒫 𝑂) → (𝑀‘∪ 𝑥) ≤ Σ^*𝑦 ∈ 𝑥(𝑀‘𝑦))
carsgsiga.3	⊢ ((𝜑 ∧ 𝑥 ⊆ 𝑦 ∧ 𝑦 ∈ 𝒫 𝑂) → (𝑀‘𝑥) ≤ (𝑀‘𝑦))

**Assertion**
Ref	Expression
carsgsiga	⊢ (𝜑 → (toCaraSiga‘𝑀) ∈ (sigAlgebra‘𝑂))

Distinct variable groups: 𝑥,𝑦,𝑀 𝑥,𝑂,𝑦 𝜑,𝑥,𝑦 Allowed substitution hints: 𝑉(𝑥,𝑦)

Proof of Theorem carsgsiga Dummy variable 𝑔 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		carsgval.1	. . . 4 ⊢ (𝜑 → 𝑂 ∈ 𝑉)
2		carsgval.2	. . . 4 ⊢ (𝜑 → 𝑀:𝒫 𝑂⟶(0[,]+∞))
3	1, 2	carsgcl 34442	. . 3 ⊢ (𝜑 → (toCaraSiga‘𝑀) ⊆ 𝒫 𝑂)
4		carsgsiga.1	. . . . 5 ⊢ (𝜑 → (𝑀‘∅) = 0)
5	1, 2, 4	baselcarsg 34444	. . . 4 ⊢ (𝜑 → 𝑂 ∈ (toCaraSiga‘𝑀))
6	1	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ 𝑔 ∈ (toCaraSiga‘𝑀)) → 𝑂 ∈ 𝑉)
7	2	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ 𝑔 ∈ (toCaraSiga‘𝑀)) → 𝑀:𝒫 𝑂⟶(0[,]+∞))
8		simpr 484	. . . . . 6 ⊢ ((𝜑 ∧ 𝑔 ∈ (toCaraSiga‘𝑀)) → 𝑔 ∈ (toCaraSiga‘𝑀))
9	6, 7, 8	difelcarsg 34448	. . . . 5 ⊢ ((𝜑 ∧ 𝑔 ∈ (toCaraSiga‘𝑀)) → (𝑂 ∖ 𝑔) ∈ (toCaraSiga‘𝑀))
10	9	ralrimiva 3129	. . . 4 ⊢ (𝜑 → ∀𝑔 ∈ (toCaraSiga‘𝑀)(𝑂 ∖ 𝑔) ∈ (toCaraSiga‘𝑀))
11	1	ad2antrr 727	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) → 𝑂 ∈ 𝑉)
12	2	ad2antrr 727	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) → 𝑀:𝒫 𝑂⟶(0[,]+∞))
13	4	ad2antrr 727	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) → (𝑀‘∅) = 0)
14		carsgsiga.2	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ≼ ω ∧ 𝑥 ⊆ 𝒫 𝑂) → (𝑀‘∪ 𝑥) ≤ Σ^*𝑦 ∈ 𝑥(𝑀‘𝑦))
15	14	3adant1r 1179	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑥 ≼ ω ∧ 𝑥 ⊆ 𝒫 𝑂) → (𝑀‘∪ 𝑥) ≤ Σ^*𝑦 ∈ 𝑥(𝑀‘𝑦))
16	15	3adant1r 1179	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) ∧ 𝑥 ≼ ω ∧ 𝑥 ⊆ 𝒫 𝑂) → (𝑀‘∪ 𝑥) ≤ Σ^*𝑦 ∈ 𝑥(𝑀‘𝑦))
17		carsgsiga.3	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ⊆ 𝑦 ∧ 𝑦 ∈ 𝒫 𝑂) → (𝑀‘𝑥) ≤ (𝑀‘𝑦))
18	17	3adant1r 1179	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑥 ⊆ 𝑦 ∧ 𝑦 ∈ 𝒫 𝑂) → (𝑀‘𝑥) ≤ (𝑀‘𝑦))
19	18	3adant1r 1179	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) ∧ 𝑥 ⊆ 𝑦 ∧ 𝑦 ∈ 𝒫 𝑂) → (𝑀‘𝑥) ≤ (𝑀‘𝑦))
20		simpr 484	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) → 𝑔 ≼ ω)
21		elpwi 4562	. . . . . . . 8 ⊢ (𝑔 ∈ 𝒫 (toCaraSiga‘𝑀) → 𝑔 ⊆ (toCaraSiga‘𝑀))
22	21	ad2antlr 728	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) → 𝑔 ⊆ (toCaraSiga‘𝑀))
23	11, 12, 13, 16, 19, 20, 22	carsgclctun 34459	. . . . . 6 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) → ∪ 𝑔 ∈ (toCaraSiga‘𝑀))
24	23	ex 412	. . . . 5 ⊢ ((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) → (𝑔 ≼ ω → ∪ 𝑔 ∈ (toCaraSiga‘𝑀)))
25	24	ralrimiva 3129	. . . 4 ⊢ (𝜑 → ∀𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)(𝑔 ≼ ω → ∪ 𝑔 ∈ (toCaraSiga‘𝑀)))
26	5, 10, 25	3jca 1129	. . 3 ⊢ (𝜑 → (𝑂 ∈ (toCaraSiga‘𝑀) ∧ ∀𝑔 ∈ (toCaraSiga‘𝑀)(𝑂 ∖ 𝑔) ∈ (toCaraSiga‘𝑀) ∧ ∀𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)(𝑔 ≼ ω → ∪ 𝑔 ∈ (toCaraSiga‘𝑀))))
27	3, 26	jca 511	. 2 ⊢ (𝜑 → ((toCaraSiga‘𝑀) ⊆ 𝒫 𝑂 ∧ (𝑂 ∈ (toCaraSiga‘𝑀) ∧ ∀𝑔 ∈ (toCaraSiga‘𝑀)(𝑂 ∖ 𝑔) ∈ (toCaraSiga‘𝑀) ∧ ∀𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)(𝑔 ≼ ω → ∪ 𝑔 ∈ (toCaraSiga‘𝑀)))))
28		fvex 6848	. . 3 ⊢ (toCaraSiga‘𝑀) ∈ V
29		issiga 34250	. . 3 ⊢ ((toCaraSiga‘𝑀) ∈ V → ((toCaraSiga‘𝑀) ∈ (sigAlgebra‘𝑂) ↔ ((toCaraSiga‘𝑀) ⊆ 𝒫 𝑂 ∧ (𝑂 ∈ (toCaraSiga‘𝑀) ∧ ∀𝑔 ∈ (toCaraSiga‘𝑀)(𝑂 ∖ 𝑔) ∈ (toCaraSiga‘𝑀) ∧ ∀𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)(𝑔 ≼ ω → ∪ 𝑔 ∈ (toCaraSiga‘𝑀))))))
30	28, 29	ax-mp 5	. 2 ⊢ ((toCaraSiga‘𝑀) ∈ (sigAlgebra‘𝑂) ↔ ((toCaraSiga‘𝑀) ⊆ 𝒫 𝑂 ∧ (𝑂 ∈ (toCaraSiga‘𝑀) ∧ ∀𝑔 ∈ (toCaraSiga‘𝑀)(𝑂 ∖ 𝑔) ∈ (toCaraSiga‘𝑀) ∧ ∀𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)(𝑔 ≼ ω → ∪ 𝑔 ∈ (toCaraSiga‘𝑀)))))
31	27, 30	sylibr 234	1 ⊢ (𝜑 → (toCaraSiga‘𝑀) ∈ (sigAlgebra‘𝑂))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1087 = wceq 1542 ∈ wcel 2114 ∀wral 3052 Vcvv 3441 ∖ cdif 3899 ⊆ wss 3902 ∅c0 4286 𝒫 cpw 4555 ∪ cuni 4864 class class class wbr 5099 ⟶wf 6489 ‘cfv 6493 (class class class)co 7360 ωcom 7810 ≼ cdom 8885 0cc0 11030 +∞cpnf 11167 ≤ cle 11171 [,]cicc 13268 Σ^*cesum 34165 sigAlgebracsiga 34246 toCaraSigaccarsg 34439

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5225 ax-sep 5242 ax-nul 5252 ax-pow 5311 ax-pr 5378 ax-un 7682 ax-inf2 9554 ax-ac2 10377 ax-cnex 11086 ax-resscn 11087 ax-1cn 11088 ax-icn 11089 ax-addcl 11090 ax-addrcl 11091 ax-mulcl 11092 ax-mulrcl 11093 ax-mulcom 11094 ax-addass 11095 ax-mulass 11096 ax-distr 11097 ax-i2m1 11098 ax-1ne0 11099 ax-1rid 11100 ax-rnegex 11101 ax-rrecex 11102 ax-cnre 11103 ax-pre-lttri 11104 ax-pre-lttrn 11105 ax-pre-ltadd 11106 ax-pre-mulgt0 11107 ax-pre-sup 11108 ax-addf 11109 ax-mulf 11110

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3062 df-rmo 3351 df-reu 3352 df-rab 3401 df-v 3443 df-sbc 3742 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4287 df-if 4481 df-pw 4557 df-sn 4582 df-pr 4584 df-tp 4586 df-op 4588 df-uni 4865 df-int 4904 df-iun 4949 df-iin 4950 df-disj 5067 df-br 5100 df-opab 5162 df-mpt 5181 df-tr 5207 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-se 5579 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-pred 6260 df-ord 6321 df-on 6322 df-lim 6323 df-suc 6324 df-iota 6449 df-fun 6495 df-fn 6496 df-f 6497 df-f1 6498 df-fo 6499 df-f1o 6500 df-fv 6501 df-isom 6502 df-riota 7317 df-ov 7363 df-oprab 7364 df-mpo 7365 df-of 7624 df-om 7811 df-1st 7935 df-2nd 7936 df-supp 8105 df-frecs 8225 df-wrecs 8256 df-recs 8305 df-rdg 8343 df-1o 8399 df-2o 8400 df-er 8637 df-map 8769 df-pm 8770 df-ixp 8840 df-en 8888 df-dom 8889 df-sdom 8890 df-fin 8891 df-fsupp 9269 df-fi 9318 df-sup 9349 df-inf 9350 df-oi 9419 df-dju 9817 df-card 9855 df-acn 9858 df-ac 10030 df-pnf 11172 df-mnf 11173 df-xr 11174 df-ltxr 11175 df-le 11176 df-sub 11370 df-neg 11371 df-div 11799 df-nn 12150 df-2 12212 df-3 12213 df-4 12214 df-5 12215 df-6 12216 df-7 12217 df-8 12218 df-9 12219 df-n0 12406 df-z 12493 df-dec 12612 df-uz 12756 df-q 12866 df-rp 12910 df-xneg 13030 df-xadd 13031 df-xmul 13032 df-ioo 13269 df-ioc 13270 df-ico 13271 df-icc 13272 df-fz 13428 df-fzo 13575 df-fl 13716 df-mod 13794 df-seq 13929 df-exp 13989 df-fac 14201 df-bc 14230 df-hash 14258 df-shft 14994 df-cj 15026 df-re 15027 df-im 15028 df-sqrt 15162 df-abs 15163 df-limsup 15398 df-clim 15415 df-rlim 15416 df-sum 15614 df-ef 15994 df-sin 15996 df-cos 15997 df-pi 15999 df-struct 17078 df-sets 17095 df-slot 17113 df-ndx 17125 df-base 17141 df-ress 17162 df-plusg 17194 df-mulr 17195 df-starv 17196 df-sca 17197 df-vsca 17198 df-ip 17199 df-tset 17200 df-ple 17201 df-ds 17203 df-unif 17204 df-hom 17205 df-cco 17206 df-rest 17346 df-topn 17347 df-0g 17365 df-gsum 17366 df-topgen 17367 df-pt 17368 df-prds 17371 df-ordt 17426 df-xrs 17427 df-qtop 17432 df-imas 17433 df-xps 17435 df-mre 17509 df-mrc 17510 df-acs 17512 df-ps 18493 df-tsr 18494 df-plusf 18568 df-mgm 18569 df-sgrp 18648 df-mnd 18664 df-mhm 18712 df-submnd 18713 df-grp 18870 df-minusg 18871 df-sbg 18872 df-mulg 19002 df-subg 19057 df-cntz 19250 df-cmn 19715 df-abl 19716 df-mgp 20080 df-rng 20092 df-ur 20121 df-ring 20174 df-cring 20175 df-subrng 20483 df-subrg 20507 df-abv 20746 df-lmod 20817 df-scaf 20818 df-sra 21129 df-rgmod 21130 df-psmet 21305 df-xmet 21306 df-met 21307 df-bl 21308 df-mopn 21309 df-fbas 21310 df-fg 21311 df-cnfld 21314 df-top 22842 df-topon 22859 df-topsp 22881 df-bases 22894 df-cld 22967 df-ntr 22968 df-cls 22969 df-nei 23046 df-lp 23084 df-perf 23085 df-cn 23175 df-cnp 23176 df-haus 23263 df-tx 23510 df-hmeo 23703 df-fil 23794 df-fm 23886 df-flim 23887 df-flf 23888 df-tmd 24020 df-tgp 24021 df-tsms 24075 df-trg 24108 df-xms 24268 df-ms 24269 df-tms 24270 df-nm 24530 df-ngp 24531 df-nrg 24533 df-nlm 24534 df-ii 24830 df-cncf 24831 df-limc 25827 df-dv 25828 df-log 26525 df-esum 34166 df-siga 34247 df-carsg 34440

This theorem is referenced by: omsmeas 34461

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