carsgsiga - Mathbox for Thierry Arnoux

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Theorem carsgsiga 33975

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 33957	. . 3 ⊢ (𝜑 → (toCaraSiga‘𝑀) ⊆ 𝒫 𝑂)
4		carsgsiga.1	. . . . 5 ⊢ (𝜑 → (𝑀‘∅) = 0)
5	1, 2, 4	baselcarsg 33959	. . . 4 ⊢ (𝜑 → 𝑂 ∈ (toCaraSiga‘𝑀))
6	1	adantr 479	. . . . . 6 ⊢ ((𝜑 ∧ 𝑔 ∈ (toCaraSiga‘𝑀)) → 𝑂 ∈ 𝑉)
7	2	adantr 479	. . . . . 6 ⊢ ((𝜑 ∧ 𝑔 ∈ (toCaraSiga‘𝑀)) → 𝑀:𝒫 𝑂⟶(0[,]+∞))
8		simpr 483	. . . . . 6 ⊢ ((𝜑 ∧ 𝑔 ∈ (toCaraSiga‘𝑀)) → 𝑔 ∈ (toCaraSiga‘𝑀))
9	6, 7, 8	difelcarsg 33963	. . . . 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 724	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) → 𝑂 ∈ 𝑉)
12	2	ad2antrr 724	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) → 𝑀:𝒫 𝑂⟶(0[,]+∞))
13	4	ad2antrr 724	. . . . . . 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 1174	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑥 ≼ ω ∧ 𝑥 ⊆ 𝒫 𝑂) → (𝑀‘∪ 𝑥) ≤ Σ^*𝑦 ∈ 𝑥(𝑀‘𝑦))
16	15	3adant1r 1174	. . . . . . 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 1174	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑥 ⊆ 𝑦 ∧ 𝑦 ∈ 𝒫 𝑂) → (𝑀‘𝑥) ≤ (𝑀‘𝑦))
19	18	3adant1r 1174	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) ∧ 𝑥 ⊆ 𝑦 ∧ 𝑦 ∈ 𝒫 𝑂) → (𝑀‘𝑥) ≤ (𝑀‘𝑦))
20		simpr 483	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) → 𝑔 ≼ ω)
21		elpwi 4613	. . . . . . . 8 ⊢ (𝑔 ∈ 𝒫 (toCaraSiga‘𝑀) → 𝑔 ⊆ (toCaraSiga‘𝑀))
22	21	ad2antlr 725	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) → 𝑔 ⊆ (toCaraSiga‘𝑀))
23	11, 12, 13, 16, 19, 20, 22	carsgclctun 33974	. . . . . 6 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝒫 (toCaraSiga‘𝑀)) ∧ 𝑔 ≼ ω) → ∪ 𝑔 ∈ (toCaraSiga‘𝑀))
24	23	ex 411	. . . . 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 1125	. . 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 510	. 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 6915	. . 3 ⊢ (toCaraSiga‘𝑀) ∈ V
29		issiga 33764	. . 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 233	1 ⊢ (𝜑 → (toCaraSiga‘𝑀) ∈ (sigAlgebra‘𝑂))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 394 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ∀wral 3058 Vcvv 3473 ∖ cdif 3946 ⊆ wss 3949 ∅c0 4326 𝒫 cpw 4606 ∪ cuni 4912 class class class wbr 5152 ⟶wf 6549 ‘cfv 6553 (class class class)co 7426 ωcom 7876 ≼ cdom 8968 0cc0 11146 +∞cpnf 11283 ≤ cle 11287 [,]cicc 13367 Σ^*cesum 33679 sigAlgebracsiga 33760 toCaraSigaccarsg 33954

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2699 ax-rep 5289 ax-sep 5303 ax-nul 5310 ax-pow 5369 ax-pr 5433 ax-un 7746 ax-inf2 9672 ax-ac2 10494 ax-cnex 11202 ax-resscn 11203 ax-1cn 11204 ax-icn 11205 ax-addcl 11206 ax-addrcl 11207 ax-mulcl 11208 ax-mulrcl 11209 ax-mulcom 11210 ax-addass 11211 ax-mulass 11212 ax-distr 11213 ax-i2m1 11214 ax-1ne0 11215 ax-1rid 11216 ax-rnegex 11217 ax-rrecex 11218 ax-cnre 11219 ax-pre-lttri 11220 ax-pre-lttrn 11221 ax-pre-ltadd 11222 ax-pre-mulgt0 11223 ax-pre-sup 11224 ax-addf 11225 ax-mulf 11226

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2529 df-eu 2558 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3475 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4327 df-if 4533 df-pw 4608 df-sn 4633 df-pr 4635 df-tp 4637 df-op 4639 df-uni 4913 df-int 4954 df-iun 5002 df-iin 5003 df-disj 5118 df-br 5153 df-opab 5215 df-mpt 5236 df-tr 5270 df-id 5580 df-eprel 5586 df-po 5594 df-so 5595 df-fr 5637 df-se 5638 df-we 5639 df-xp 5688 df-rel 5689 df-cnv 5690 df-co 5691 df-dm 5692 df-rn 5693 df-res 5694 df-ima 5695 df-pred 6310 df-ord 6377 df-on 6378 df-lim 6379 df-suc 6380 df-iota 6505 df-fun 6555 df-fn 6556 df-f 6557 df-f1 6558 df-fo 6559 df-f1o 6560 df-fv 6561 df-isom 6562 df-riota 7382 df-ov 7429 df-oprab 7430 df-mpo 7431 df-of 7691 df-om 7877 df-1st 7999 df-2nd 8000 df-supp 8172 df-frecs 8293 df-wrecs 8324 df-recs 8398 df-rdg 8437 df-1o 8493 df-2o 8494 df-er 8731 df-map 8853 df-pm 8854 df-ixp 8923 df-en 8971 df-dom 8972 df-sdom 8973 df-fin 8974 df-fsupp 9394 df-fi 9442 df-sup 9473 df-inf 9474 df-oi 9541 df-dju 9932 df-card 9970 df-acn 9973 df-ac 10147 df-pnf 11288 df-mnf 11289 df-xr 11290 df-ltxr 11291 df-le 11292 df-sub 11484 df-neg 11485 df-div 11910 df-nn 12251 df-2 12313 df-3 12314 df-4 12315 df-5 12316 df-6 12317 df-7 12318 df-8 12319 df-9 12320 df-n0 12511 df-z 12597 df-dec 12716 df-uz 12861 df-q 12971 df-rp 13015 df-xneg 13132 df-xadd 13133 df-xmul 13134 df-ioo 13368 df-ioc 13369 df-ico 13370 df-icc 13371 df-fz 13525 df-fzo 13668 df-fl 13797 df-mod 13875 df-seq 14007 df-exp 14067 df-fac 14273 df-bc 14302 df-hash 14330 df-shft 15054 df-cj 15086 df-re 15087 df-im 15088 df-sqrt 15222 df-abs 15223 df-limsup 15455 df-clim 15472 df-rlim 15473 df-sum 15673 df-ef 16051 df-sin 16053 df-cos 16054 df-pi 16056 df-struct 17123 df-sets 17140 df-slot 17158 df-ndx 17170 df-base 17188 df-ress 17217 df-plusg 17253 df-mulr 17254 df-starv 17255 df-sca 17256 df-vsca 17257 df-ip 17258 df-tset 17259 df-ple 17260 df-ds 17262 df-unif 17263 df-hom 17264 df-cco 17265 df-rest 17411 df-topn 17412 df-0g 17430 df-gsum 17431 df-topgen 17432 df-pt 17433 df-prds 17436 df-ordt 17490 df-xrs 17491 df-qtop 17496 df-imas 17497 df-xps 17499 df-mre 17573 df-mrc 17574 df-acs 17576 df-ps 18565 df-tsr 18566 df-plusf 18606 df-mgm 18607 df-sgrp 18686 df-mnd 18702 df-mhm 18747 df-submnd 18748 df-grp 18900 df-minusg 18901 df-sbg 18902 df-mulg 19031 df-subg 19085 df-cntz 19275 df-cmn 19744 df-abl 19745 df-mgp 20082 df-rng 20100 df-ur 20129 df-ring 20182 df-cring 20183 df-subrng 20490 df-subrg 20515 df-abv 20704 df-lmod 20752 df-scaf 20753 df-sra 21065 df-rgmod 21066 df-psmet 21278 df-xmet 21279 df-met 21280 df-bl 21281 df-mopn 21282 df-fbas 21283 df-fg 21284 df-cnfld 21287 df-top 22816 df-topon 22833 df-topsp 22855 df-bases 22869 df-cld 22943 df-ntr 22944 df-cls 22945 df-nei 23022 df-lp 23060 df-perf 23061 df-cn 23151 df-cnp 23152 df-haus 23239 df-tx 23486 df-hmeo 23679 df-fil 23770 df-fm 23862 df-flim 23863 df-flf 23864 df-tmd 23996 df-tgp 23997 df-tsms 24051 df-trg 24084 df-xms 24246 df-ms 24247 df-tms 24248 df-nm 24511 df-ngp 24512 df-nrg 24514 df-nlm 24515 df-ii 24817 df-cncf 24818 df-limc 25815 df-dv 25816 df-log 26510 df-esum 33680 df-siga 33761 df-carsg 33955

This theorem is referenced by: omsmeas 33976

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