measunl - Mathbox for Thierry Arnoux

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Theorem measunl 34227

Description: A measure is sub-additive with respect to union. (Contributed by Thierry Arnoux, 20-Oct-2017.)

**Hypotheses**
Ref	Expression
measunl.1	⊢ (𝜑 → 𝑀 ∈ (measures‘𝑆))
measunl.2	⊢ (𝜑 → 𝐴 ∈ 𝑆)
measunl.3	⊢ (𝜑 → 𝐵 ∈ 𝑆)

**Assertion**
Ref	Expression
measunl	⊢ (𝜑 → (𝑀‘(𝐴 ∪ 𝐵)) ≤ ((𝑀‘𝐴) +_𝑒 (𝑀‘𝐵)))

**Proof of Theorem measunl**
Step	Hyp	Ref	Expression
1		undif1 4426	. . . 4 ⊢ ((𝐴 ∖ 𝐵) ∪ 𝐵) = (𝐴 ∪ 𝐵)
2	1	fveq2i 6825	. . 3 ⊢ (𝑀‘((𝐴 ∖ 𝐵) ∪ 𝐵)) = (𝑀‘(𝐴 ∪ 𝐵))
3		measunl.1	. . . 4 ⊢ (𝜑 → 𝑀 ∈ (measures‘𝑆))
4		measbase 34208	. . . . . 6 ⊢ (𝑀 ∈ (measures‘𝑆) → 𝑆 ∈ ∪ ran sigAlgebra)
5	3, 4	syl 17	. . . . 5 ⊢ (𝜑 → 𝑆 ∈ ∪ ran sigAlgebra)
6		measunl.2	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ 𝑆)
7		measunl.3	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ 𝑆)
8		difelsiga 34144	. . . . 5 ⊢ ((𝑆 ∈ ∪ ran sigAlgebra ∧ 𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) → (𝐴 ∖ 𝐵) ∈ 𝑆)
9	5, 6, 7, 8	syl3anc 1373	. . . 4 ⊢ (𝜑 → (𝐴 ∖ 𝐵) ∈ 𝑆)
10		disjdifr 4423	. . . . 5 ⊢ ((𝐴 ∖ 𝐵) ∩ 𝐵) = ∅
11	10	a1i 11	. . . 4 ⊢ (𝜑 → ((𝐴 ∖ 𝐵) ∩ 𝐵) = ∅)
12		measun 34222	. . . 4 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ ((𝐴 ∖ 𝐵) ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ ((𝐴 ∖ 𝐵) ∩ 𝐵) = ∅) → (𝑀‘((𝐴 ∖ 𝐵) ∪ 𝐵)) = ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘𝐵)))
13	3, 9, 7, 11, 12	syl121anc 1377	. . 3 ⊢ (𝜑 → (𝑀‘((𝐴 ∖ 𝐵) ∪ 𝐵)) = ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘𝐵)))
14	2, 13	eqtr3id 2780	. 2 ⊢ (𝜑 → (𝑀‘(𝐴 ∪ 𝐵)) = ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘𝐵)))
15		iccssxr 13330	. . . 4 ⊢ (0[,]+∞) ⊆ ℝ^*
16		measvxrge0 34216	. . . . 5 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∖ 𝐵) ∈ 𝑆) → (𝑀‘(𝐴 ∖ 𝐵)) ∈ (0[,]+∞))
17	3, 9, 16	syl2anc 584	. . . 4 ⊢ (𝜑 → (𝑀‘(𝐴 ∖ 𝐵)) ∈ (0[,]+∞))
18	15, 17	sselid 3932	. . 3 ⊢ (𝜑 → (𝑀‘(𝐴 ∖ 𝐵)) ∈ ℝ^*)
19		measvxrge0 34216	. . . . 5 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ 𝐴 ∈ 𝑆) → (𝑀‘𝐴) ∈ (0[,]+∞))
20	3, 6, 19	syl2anc 584	. . . 4 ⊢ (𝜑 → (𝑀‘𝐴) ∈ (0[,]+∞))
21	15, 20	sselid 3932	. . 3 ⊢ (𝜑 → (𝑀‘𝐴) ∈ ℝ^*)
22		measvxrge0 34216	. . . . 5 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ 𝐵 ∈ 𝑆) → (𝑀‘𝐵) ∈ (0[,]+∞))
23	3, 7, 22	syl2anc 584	. . . 4 ⊢ (𝜑 → (𝑀‘𝐵) ∈ (0[,]+∞))
24	15, 23	sselid 3932	. . 3 ⊢ (𝜑 → (𝑀‘𝐵) ∈ ℝ^*)
25		inelsiga 34146	. . . . . . . . 9 ⊢ ((𝑆 ∈ ∪ ran sigAlgebra ∧ 𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) → (𝐴 ∩ 𝐵) ∈ 𝑆)
26	5, 6, 7, 25	syl3anc 1373	. . . . . . . 8 ⊢ (𝜑 → (𝐴 ∩ 𝐵) ∈ 𝑆)
27		measvxrge0 34216	. . . . . . . 8 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∩ 𝐵) ∈ 𝑆) → (𝑀‘(𝐴 ∩ 𝐵)) ∈ (0[,]+∞))
28	3, 26, 27	syl2anc 584	. . . . . . 7 ⊢ (𝜑 → (𝑀‘(𝐴 ∩ 𝐵)) ∈ (0[,]+∞))
29		elxrge0 13357	. . . . . . 7 ⊢ ((𝑀‘(𝐴 ∩ 𝐵)) ∈ (0[,]+∞) ↔ ((𝑀‘(𝐴 ∩ 𝐵)) ∈ ℝ^* ∧ 0 ≤ (𝑀‘(𝐴 ∩ 𝐵))))
30	28, 29	sylib 218	. . . . . 6 ⊢ (𝜑 → ((𝑀‘(𝐴 ∩ 𝐵)) ∈ ℝ^* ∧ 0 ≤ (𝑀‘(𝐴 ∩ 𝐵))))
31	30	simprd 495	. . . . 5 ⊢ (𝜑 → 0 ≤ (𝑀‘(𝐴 ∩ 𝐵)))
32	15, 28	sselid 3932	. . . . . 6 ⊢ (𝜑 → (𝑀‘(𝐴 ∩ 𝐵)) ∈ ℝ^*)
33		xraddge02 32738	. . . . . 6 ⊢ (((𝑀‘(𝐴 ∖ 𝐵)) ∈ ℝ^* ∧ (𝑀‘(𝐴 ∩ 𝐵)) ∈ ℝ^*) → (0 ≤ (𝑀‘(𝐴 ∩ 𝐵)) → (𝑀‘(𝐴 ∖ 𝐵)) ≤ ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘(𝐴 ∩ 𝐵)))))
34	18, 32, 33	syl2anc 584	. . . . 5 ⊢ (𝜑 → (0 ≤ (𝑀‘(𝐴 ∩ 𝐵)) → (𝑀‘(𝐴 ∖ 𝐵)) ≤ ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘(𝐴 ∩ 𝐵)))))
35	31, 34	mpd 15	. . . 4 ⊢ (𝜑 → (𝑀‘(𝐴 ∖ 𝐵)) ≤ ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘(𝐴 ∩ 𝐵))))
36		uncom 4108	. . . . . . 7 ⊢ ((𝐴 ∩ 𝐵) ∪ (𝐴 ∖ 𝐵)) = ((𝐴 ∖ 𝐵) ∪ (𝐴 ∩ 𝐵))
37		inundif 4429	. . . . . . 7 ⊢ ((𝐴 ∩ 𝐵) ∪ (𝐴 ∖ 𝐵)) = 𝐴
38	36, 37	eqtr3i 2756	. . . . . 6 ⊢ ((𝐴 ∖ 𝐵) ∪ (𝐴 ∩ 𝐵)) = 𝐴
39	38	fveq2i 6825	. . . . 5 ⊢ (𝑀‘((𝐴 ∖ 𝐵) ∪ (𝐴 ∩ 𝐵))) = (𝑀‘𝐴)
40		incom 4159	. . . . . . . 8 ⊢ ((𝐴 ∩ 𝐵) ∩ (𝐴 ∖ 𝐵)) = ((𝐴 ∖ 𝐵) ∩ (𝐴 ∩ 𝐵))
41		inindif 4325	. . . . . . . 8 ⊢ ((𝐴 ∩ 𝐵) ∩ (𝐴 ∖ 𝐵)) = ∅
42	40, 41	eqtr3i 2756	. . . . . . 7 ⊢ ((𝐴 ∖ 𝐵) ∩ (𝐴 ∩ 𝐵)) = ∅
43	42	a1i 11	. . . . . 6 ⊢ (𝜑 → ((𝐴 ∖ 𝐵) ∩ (𝐴 ∩ 𝐵)) = ∅)
44		measun 34222	. . . . . 6 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ ((𝐴 ∖ 𝐵) ∈ 𝑆 ∧ (𝐴 ∩ 𝐵) ∈ 𝑆) ∧ ((𝐴 ∖ 𝐵) ∩ (𝐴 ∩ 𝐵)) = ∅) → (𝑀‘((𝐴 ∖ 𝐵) ∪ (𝐴 ∩ 𝐵))) = ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘(𝐴 ∩ 𝐵))))
45	3, 9, 26, 43, 44	syl121anc 1377	. . . . 5 ⊢ (𝜑 → (𝑀‘((𝐴 ∖ 𝐵) ∪ (𝐴 ∩ 𝐵))) = ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘(𝐴 ∩ 𝐵))))
46	39, 45	eqtr3id 2780	. . . 4 ⊢ (𝜑 → (𝑀‘𝐴) = ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘(𝐴 ∩ 𝐵))))
47	35, 46	breqtrrd 5119	. . 3 ⊢ (𝜑 → (𝑀‘(𝐴 ∖ 𝐵)) ≤ (𝑀‘𝐴))
48		xleadd1a 13152	. . 3 ⊢ ((((𝑀‘(𝐴 ∖ 𝐵)) ∈ ℝ^* ∧ (𝑀‘𝐴) ∈ ℝ^* ∧ (𝑀‘𝐵) ∈ ℝ^*) ∧ (𝑀‘(𝐴 ∖ 𝐵)) ≤ (𝑀‘𝐴)) → ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘𝐵)) ≤ ((𝑀‘𝐴) +_𝑒 (𝑀‘𝐵)))
49	18, 21, 24, 47, 48	syl31anc 1375	. 2 ⊢ (𝜑 → ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘𝐵)) ≤ ((𝑀‘𝐴) +_𝑒 (𝑀‘𝐵)))
50	14, 49	eqbrtrd 5113	1 ⊢ (𝜑 → (𝑀‘(𝐴 ∪ 𝐵)) ≤ ((𝑀‘𝐴) +_𝑒 (𝑀‘𝐵)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1541 ∈ wcel 2111 ∖ cdif 3899 ∪ cun 3900 ∩ cin 3901 ∅c0 4283 ∪ cuni 4859 class class class wbr 5091 ran crn 5617 ‘cfv 6481 (class class class)co 7346 0cc0 11006 +∞cpnf 11143 ℝ^*cxr 11145 ≤ cle 11147 +_𝑒 cxad 13009 [,]cicc 13248 sigAlgebracsiga 34119 measurescmeas 34206

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-rep 5217 ax-sep 5234 ax-nul 5244 ax-pow 5303 ax-pr 5370 ax-un 7668 ax-inf2 9531 ax-ac2 10354 ax-cnex 11062 ax-resscn 11063 ax-1cn 11064 ax-icn 11065 ax-addcl 11066 ax-addrcl 11067 ax-mulcl 11068 ax-mulrcl 11069 ax-mulcom 11070 ax-addass 11071 ax-mulass 11072 ax-distr 11073 ax-i2m1 11074 ax-1ne0 11075 ax-1rid 11076 ax-rnegex 11077 ax-rrecex 11078 ax-cnre 11079 ax-pre-lttri 11080 ax-pre-lttrn 11081 ax-pre-ltadd 11082 ax-pre-mulgt0 11083 ax-pre-sup 11084 ax-addf 11085 ax-mulf 11086

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-rmo 3346 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3742 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4284 df-if 4476 df-pw 4552 df-sn 4577 df-pr 4579 df-tp 4581 df-op 4583 df-uni 4860 df-int 4898 df-iun 4943 df-iin 4944 df-disj 5059 df-br 5092 df-opab 5154 df-mpt 5173 df-tr 5199 df-id 5511 df-eprel 5516 df-po 5524 df-so 5525 df-fr 5569 df-se 5570 df-we 5571 df-xp 5622 df-rel 5623 df-cnv 5624 df-co 5625 df-dm 5626 df-rn 5627 df-res 5628 df-ima 5629 df-pred 6248 df-ord 6309 df-on 6310 df-lim 6311 df-suc 6312 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-isom 6490 df-riota 7303 df-ov 7349 df-oprab 7350 df-mpo 7351 df-of 7610 df-om 7797 df-1st 7921 df-2nd 7922 df-supp 8091 df-frecs 8211 df-wrecs 8242 df-recs 8291 df-rdg 8329 df-1o 8385 df-2o 8386 df-er 8622 df-map 8752 df-pm 8753 df-ixp 8822 df-en 8870 df-dom 8871 df-sdom 8872 df-fin 8873 df-fsupp 9246 df-fi 9295 df-sup 9326 df-inf 9327 df-oi 9396 df-dju 9794 df-card 9832 df-acn 9835 df-ac 10007 df-pnf 11148 df-mnf 11149 df-xr 11150 df-ltxr 11151 df-le 11152 df-sub 11346 df-neg 11347 df-div 11775 df-nn 12126 df-2 12188 df-3 12189 df-4 12190 df-5 12191 df-6 12192 df-7 12193 df-8 12194 df-9 12195 df-n0 12382 df-z 12469 df-dec 12589 df-uz 12733 df-q 12847 df-rp 12891 df-xneg 13011 df-xadd 13012 df-xmul 13013 df-ioo 13249 df-ioc 13250 df-ico 13251 df-icc 13252 df-fz 13408 df-fzo 13555 df-fl 13696 df-mod 13774 df-seq 13909 df-exp 13969 df-fac 14181 df-bc 14210 df-hash 14238 df-shft 14974 df-cj 15006 df-re 15007 df-im 15008 df-sqrt 15142 df-abs 15143 df-limsup 15378 df-clim 15395 df-rlim 15396 df-sum 15594 df-ef 15974 df-sin 15976 df-cos 15977 df-pi 15979 df-struct 17058 df-sets 17075 df-slot 17093 df-ndx 17105 df-base 17121 df-ress 17142 df-plusg 17174 df-mulr 17175 df-starv 17176 df-sca 17177 df-vsca 17178 df-ip 17179 df-tset 17180 df-ple 17181 df-ds 17183 df-unif 17184 df-hom 17185 df-cco 17186 df-rest 17326 df-topn 17327 df-0g 17345 df-gsum 17346 df-topgen 17347 df-pt 17348 df-prds 17351 df-ordt 17405 df-xrs 17406 df-qtop 17411 df-imas 17412 df-xps 17414 df-mre 17488 df-mrc 17489 df-acs 17491 df-ps 18472 df-tsr 18473 df-plusf 18547 df-mgm 18548 df-sgrp 18627 df-mnd 18643 df-mhm 18691 df-submnd 18692 df-grp 18849 df-minusg 18850 df-sbg 18851 df-mulg 18981 df-subg 19036 df-cntz 19230 df-cmn 19695 df-abl 19696 df-mgp 20060 df-rng 20072 df-ur 20101 df-ring 20154 df-cring 20155 df-subrng 20462 df-subrg 20486 df-abv 20725 df-lmod 20796 df-scaf 20797 df-sra 21108 df-rgmod 21109 df-psmet 21284 df-xmet 21285 df-met 21286 df-bl 21287 df-mopn 21288 df-fbas 21289 df-fg 21290 df-cnfld 21293 df-top 22810 df-topon 22827 df-topsp 22849 df-bases 22862 df-cld 22935 df-ntr 22936 df-cls 22937 df-nei 23014 df-lp 23052 df-perf 23053 df-cn 23143 df-cnp 23144 df-haus 23231 df-tx 23478 df-hmeo 23671 df-fil 23762 df-fm 23854 df-flim 23855 df-flf 23856 df-tmd 23988 df-tgp 23989 df-tsms 24043 df-trg 24076 df-xms 24236 df-ms 24237 df-tms 24238 df-nm 24498 df-ngp 24499 df-nrg 24501 df-nlm 24502 df-ii 24798 df-cncf 24799 df-limc 25795 df-dv 25796 df-log 26493 df-esum 34039 df-siga 34120 df-meas 34207

This theorem is referenced by: aean 34255

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