carsgsiga - Mathbox for Thierry Arnoux

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Theorem carsgsiga 34303

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 34285	. . 3 ⊢ (𝜑 → (toCaraSiga‘𝑀) ⊆ 𝒫 𝑂)
4		carsgsiga.1	. . . . 5 ⊢ (𝜑 → (𝑀‘∅) = 0)
5	1, 2, 4	baselcarsg 34287	. . . 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 34291	. . . . 5 ⊢ ((𝜑 ∧ 𝑔 ∈ (toCaraSiga‘𝑀)) → (𝑂 ∖ 𝑔) ∈ (toCaraSiga‘𝑀))
10	9	ralrimiva 3143	. . . 4 ⊢ (𝜑 → ∀𝑔 ∈ (toCaraSiga‘𝑀)(𝑂 ∖ 𝑔) ∈ (toCaraSiga‘𝑀))
11	1	ad2antrr 726	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) → 𝑂 ∈ 𝑉)
12	2	ad2antrr 726	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) → 𝑀:𝒫 𝑂⟶(0[,]+∞))
13	4	ad2antrr 726	. . . . . . 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 1176	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑥 ≼ ω ∧ 𝑥 ⊆ 𝒫 𝑂) → (𝑀‘∪ 𝑥) ≤ Σ^*𝑦 ∈ 𝑥(𝑀‘𝑦))
16	15	3adant1r 1176	. . . . . . 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 1176	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑥 ⊆ 𝑦 ∧ 𝑦 ∈ 𝒫 𝑂) → (𝑀‘𝑥) ≤ (𝑀‘𝑦))
19	18	3adant1r 1176	. . . . . . 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 4611	. . . . . . . 8 ⊢ (𝑔 ∈ 𝒫 (toCaraSiga‘𝑀) → 𝑔 ⊆ (toCaraSiga‘𝑀))
22	21	ad2antlr 727	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) → 𝑔 ⊆ (toCaraSiga‘𝑀))
23	11, 12, 13, 16, 19, 20, 22	carsgclctun 34302	. . . . . 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 3143	. . . 4 ⊢ (𝜑 → ∀𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)(𝑔 ≼ ω → ∪ 𝑔 ∈ (toCaraSiga‘𝑀)))
26	5, 10, 25	3jca 1127	. . 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 6919	. . 3 ⊢ (toCaraSiga‘𝑀) ∈ V
29		issiga 34092	. . 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 1086 = wceq 1536 ∈ wcel 2105 ∀wral 3058 Vcvv 3477 ∖ cdif 3959 ⊆ wss 3962 ∅c0 4338 𝒫 cpw 4604 ∪ cuni 4911 class class class wbr 5147 ⟶wf 6558 ‘cfv 6562 (class class class)co 7430 ωcom 7886 ≼ cdom 8981 0cc0 11152 +∞cpnf 11289 ≤ cle 11293 [,]cicc 13386 Σ^*cesum 34007 sigAlgebracsiga 34088 toCaraSigaccarsg 34282

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1791 ax-4 1805 ax-5 1907 ax-6 1964 ax-7 2004 ax-8 2107 ax-9 2115 ax-10 2138 ax-11 2154 ax-12 2174 ax-ext 2705 ax-rep 5284 ax-sep 5301 ax-nul 5311 ax-pow 5370 ax-pr 5437 ax-un 7753 ax-inf2 9678 ax-ac2 10500 ax-cnex 11208 ax-resscn 11209 ax-1cn 11210 ax-icn 11211 ax-addcl 11212 ax-addrcl 11213 ax-mulcl 11214 ax-mulrcl 11215 ax-mulcom 11216 ax-addass 11217 ax-mulass 11218 ax-distr 11219 ax-i2m1 11220 ax-1ne0 11221 ax-1rid 11222 ax-rnegex 11223 ax-rrecex 11224 ax-cnre 11225 ax-pre-lttri 11226 ax-pre-lttrn 11227 ax-pre-ltadd 11228 ax-pre-mulgt0 11229 ax-pre-sup 11230 ax-addf 11231 ax-mulf 11232

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1539 df-fal 1549 df-ex 1776 df-nf 1780 df-sb 2062 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2726 df-clel 2813 df-nfc 2889 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3377 df-reu 3378 df-rab 3433 df-v 3479 df-sbc 3791 df-csb 3908 df-dif 3965 df-un 3967 df-in 3969 df-ss 3979 df-pss 3982 df-nul 4339 df-if 4531 df-pw 4606 df-sn 4631 df-pr 4633 df-tp 4635 df-op 4637 df-uni 4912 df-int 4951 df-iun 4997 df-iin 4998 df-disj 5115 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5582 df-eprel 5588 df-po 5596 df-so 5597 df-fr 5640 df-se 5641 df-we 5642 df-xp 5694 df-rel 5695 df-cnv 5696 df-co 5697 df-dm 5698 df-rn 5699 df-res 5700 df-ima 5701 df-pred 6322 df-ord 6388 df-on 6389 df-lim 6390 df-suc 6391 df-iota 6515 df-fun 6564 df-fn 6565 df-f 6566 df-f1 6567 df-fo 6568 df-f1o 6569 df-fv 6570 df-isom 6571 df-riota 7387 df-ov 7433 df-oprab 7434 df-mpo 7435 df-of 7696 df-om 7887 df-1st 8012 df-2nd 8013 df-supp 8184 df-frecs 8304 df-wrecs 8335 df-recs 8409 df-rdg 8448 df-1o 8504 df-2o 8505 df-er 8743 df-map 8866 df-pm 8867 df-ixp 8936 df-en 8984 df-dom 8985 df-sdom 8986 df-fin 8987 df-fsupp 9399 df-fi 9448 df-sup 9479 df-inf 9480 df-oi 9547 df-dju 9938 df-card 9976 df-acn 9979 df-ac 10153 df-pnf 11294 df-mnf 11295 df-xr 11296 df-ltxr 11297 df-le 11298 df-sub 11491 df-neg 11492 df-div 11918 df-nn 12264 df-2 12326 df-3 12327 df-4 12328 df-5 12329 df-6 12330 df-7 12331 df-8 12332 df-9 12333 df-n0 12524 df-z 12611 df-dec 12731 df-uz 12876 df-q 12988 df-rp 13032 df-xneg 13151 df-xadd 13152 df-xmul 13153 df-ioo 13387 df-ioc 13388 df-ico 13389 df-icc 13390 df-fz 13544 df-fzo 13691 df-fl 13828 df-mod 13906 df-seq 14039 df-exp 14099 df-fac 14309 df-bc 14338 df-hash 14366 df-shft 15102 df-cj 15134 df-re 15135 df-im 15136 df-sqrt 15270 df-abs 15271 df-limsup 15503 df-clim 15520 df-rlim 15521 df-sum 15719 df-ef 16099 df-sin 16101 df-cos 16102 df-pi 16104 df-struct 17180 df-sets 17197 df-slot 17215 df-ndx 17227 df-base 17245 df-ress 17274 df-plusg 17310 df-mulr 17311 df-starv 17312 df-sca 17313 df-vsca 17314 df-ip 17315 df-tset 17316 df-ple 17317 df-ds 17319 df-unif 17320 df-hom 17321 df-cco 17322 df-rest 17468 df-topn 17469 df-0g 17487 df-gsum 17488 df-topgen 17489 df-pt 17490 df-prds 17493 df-ordt 17547 df-xrs 17548 df-qtop 17553 df-imas 17554 df-xps 17556 df-mre 17630 df-mrc 17631 df-acs 17633 df-ps 18623 df-tsr 18624 df-plusf 18664 df-mgm 18665 df-sgrp 18744 df-mnd 18760 df-mhm 18808 df-submnd 18809 df-grp 18966 df-minusg 18967 df-sbg 18968 df-mulg 19098 df-subg 19153 df-cntz 19347 df-cmn 19814 df-abl 19815 df-mgp 20152 df-rng 20170 df-ur 20199 df-ring 20252 df-cring 20253 df-subrng 20562 df-subrg 20586 df-abv 20826 df-lmod 20876 df-scaf 20877 df-sra 21189 df-rgmod 21190 df-psmet 21373 df-xmet 21374 df-met 21375 df-bl 21376 df-mopn 21377 df-fbas 21378 df-fg 21379 df-cnfld 21382 df-top 22915 df-topon 22932 df-topsp 22954 df-bases 22968 df-cld 23042 df-ntr 23043 df-cls 23044 df-nei 23121 df-lp 23159 df-perf 23160 df-cn 23250 df-cnp 23251 df-haus 23338 df-tx 23585 df-hmeo 23778 df-fil 23869 df-fm 23961 df-flim 23962 df-flf 23963 df-tmd 24095 df-tgp 24096 df-tsms 24150 df-trg 24183 df-xms 24345 df-ms 24346 df-tms 24347 df-nm 24610 df-ngp 24611 df-nrg 24613 df-nlm 24614 df-ii 24916 df-cncf 24917 df-limc 25915 df-dv 25916 df-log 26612 df-esum 34008 df-siga 34089 df-carsg 34283

This theorem is referenced by: omsmeas 34304

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