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Theorem measunl 34473

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 4427	. . . 4 ⊢ ((𝐴 ∖ 𝐵) ∪ 𝐵) = (𝐴 ∪ 𝐵)
2	1	fveq2i 6864	. . 3 ⊢ (𝑀‘((𝐴 ∖ 𝐵) ∪ 𝐵)) = (𝑀‘(𝐴 ∪ 𝐵))
3		measunl.1	. . . 4 ⊢ (𝜑 → 𝑀 ∈ (measures‘𝑆))
4		measbase 34454	. . . . . 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 34390	. . . . 5 ⊢ ((𝑆 ∈ ∪ ran sigAlgebra ∧ 𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) → (𝐴 ∖ 𝐵) ∈ 𝑆)
9	5, 6, 7, 8	syl3anc 1389	. . . 4 ⊢ (𝜑 → (𝐴 ∖ 𝐵) ∈ 𝑆)
10		disjdifr 4424	. . . . 5 ⊢ ((𝐴 ∖ 𝐵) ∩ 𝐵) = ∅
11	10	a1i 11	. . . 4 ⊢ (𝜑 → ((𝐴 ∖ 𝐵) ∩ 𝐵) = ∅)
12		measun 34468	. . . 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 1393	. . 3 ⊢ (𝜑 → (𝑀‘((𝐴 ∖ 𝐵) ∪ 𝐵)) = ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘𝐵)))
14	2, 13	eqtr3id 2810	. 2 ⊢ (𝜑 → (𝑀‘(𝐴 ∪ 𝐵)) = ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘𝐵)))
15		iccssxr 13427	. . . 4 ⊢ (0[,]+∞) ⊆ ℝ^*
16		measvxrge0 34462	. . . . 5 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∖ 𝐵) ∈ 𝑆) → (𝑀‘(𝐴 ∖ 𝐵)) ∈ (0[,]+∞))
17	3, 9, 16	syl2anc 593	. . . 4 ⊢ (𝜑 → (𝑀‘(𝐴 ∖ 𝐵)) ∈ (0[,]+∞))
18	15, 17	sselid 3932	. . 3 ⊢ (𝜑 → (𝑀‘(𝐴 ∖ 𝐵)) ∈ ℝ^*)
19		measvxrge0 34462	. . . . 5 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ 𝐴 ∈ 𝑆) → (𝑀‘𝐴) ∈ (0[,]+∞))
20	3, 6, 19	syl2anc 593	. . . 4 ⊢ (𝜑 → (𝑀‘𝐴) ∈ (0[,]+∞))
21	15, 20	sselid 3932	. . 3 ⊢ (𝜑 → (𝑀‘𝐴) ∈ ℝ^*)
22		measvxrge0 34462	. . . . 5 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ 𝐵 ∈ 𝑆) → (𝑀‘𝐵) ∈ (0[,]+∞))
23	3, 7, 22	syl2anc 593	. . . 4 ⊢ (𝜑 → (𝑀‘𝐵) ∈ (0[,]+∞))
24	15, 23	sselid 3932	. . 3 ⊢ (𝜑 → (𝑀‘𝐵) ∈ ℝ^*)
25		inelsiga 34392	. . . . . . . . 9 ⊢ ((𝑆 ∈ ∪ ran sigAlgebra ∧ 𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) → (𝐴 ∩ 𝐵) ∈ 𝑆)
26	5, 6, 7, 25	syl3anc 1389	. . . . . . . 8 ⊢ (𝜑 → (𝐴 ∩ 𝐵) ∈ 𝑆)
27		measvxrge0 34462	. . . . . . . 8 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∩ 𝐵) ∈ 𝑆) → (𝑀‘(𝐴 ∩ 𝐵)) ∈ (0[,]+∞))
28	3, 26, 27	syl2anc 593	. . . . . . 7 ⊢ (𝜑 → (𝑀‘(𝐴 ∩ 𝐵)) ∈ (0[,]+∞))
29		elxrge0 13454	. . . . . . 7 ⊢ ((𝑀‘(𝐴 ∩ 𝐵)) ∈ (0[,]+∞) ↔ ((𝑀‘(𝐴 ∩ 𝐵)) ∈ ℝ^* ∧ 0 ≤ (𝑀‘(𝐴 ∩ 𝐵))))
30	28, 29	sylib 220	. . . . . 6 ⊢ (𝜑 → ((𝑀‘(𝐴 ∩ 𝐵)) ∈ ℝ^* ∧ 0 ≤ (𝑀‘(𝐴 ∩ 𝐵))))
31	30	simprd 499	. . . . 5 ⊢ (𝜑 → 0 ≤ (𝑀‘(𝐴 ∩ 𝐵)))
32	15, 28	sselid 3932	. . . . . 6 ⊢ (𝜑 → (𝑀‘(𝐴 ∩ 𝐵)) ∈ ℝ^*)
33		xraddge02 32919	. . . . . 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 593	. . . . 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 4109	. . . . . . 7 ⊢ ((𝐴 ∩ 𝐵) ∪ (𝐴 ∖ 𝐵)) = ((𝐴 ∖ 𝐵) ∪ (𝐴 ∩ 𝐵))
37		inundif 4430	. . . . . . 7 ⊢ ((𝐴 ∩ 𝐵) ∪ (𝐴 ∖ 𝐵)) = 𝐴
38	36, 37	eqtr3i 2786	. . . . . 6 ⊢ ((𝐴 ∖ 𝐵) ∪ (𝐴 ∩ 𝐵)) = 𝐴
39	38	fveq2i 6864	. . . . 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 2786	. . . . . . 7 ⊢ ((𝐴 ∖ 𝐵) ∩ (𝐴 ∩ 𝐵)) = ∅
43	42	a1i 11	. . . . . 6 ⊢ (𝜑 → ((𝐴 ∖ 𝐵) ∩ (𝐴 ∩ 𝐵)) = ∅)
44		measun 34468	. . . . . 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 1393	. . . . 5 ⊢ (𝜑 → (𝑀‘((𝐴 ∖ 𝐵) ∪ (𝐴 ∩ 𝐵))) = ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘(𝐴 ∩ 𝐵))))
46	39, 45	eqtr3id 2810	. . . 4 ⊢ (𝜑 → (𝑀‘𝐴) = ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘(𝐴 ∩ 𝐵))))
47	35, 46	breqtrrd 5125	. . 3 ⊢ (𝜑 → (𝑀‘(𝐴 ∖ 𝐵)) ≤ (𝑀‘𝐴))
48		xleadd1a 13249	. . 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 1391	. 2 ⊢ (𝜑 → ((𝑀‘(𝐴 ∖ 𝐵)) +_𝑒 (𝑀‘𝐵)) ≤ ((𝑀‘𝐴) +_𝑒 (𝑀‘𝐵)))
50	14, 49	eqbrtrd 5119	1 ⊢ (𝜑 → (𝑀‘(𝐴 ∪ 𝐵)) ≤ ((𝑀‘𝐴) +_𝑒 (𝑀‘𝐵)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 399 = wceq 1559 ∈ wcel 2141 ∖ cdif 3899 ∪ cun 3900 ∩ cin 3901 ∅c0 4283 ∪ cuni 4862 class class class wbr 5097 ran crn 5644 ‘cfv 6515 (class class class)co 7390 0cc0 11066 +∞cpnf 11206 ℝ^*cxr 11208 ≤ cle 11210 +_𝑒 cxad 13105 [,]cicc 13345 sigAlgebracsiga 34365 measurescmeas 34452

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-rep 5224 ax-sep 5243 ax-nul 5253 ax-pow 5319 ax-pr 5387 ax-un 7712 ax-inf2 9589 ax-ac2 10413 ax-cnex 11122 ax-resscn 11123 ax-1cn 11124 ax-icn 11125 ax-addcl 11126 ax-addrcl 11127 ax-mulcl 11128 ax-mulrcl 11129 ax-mulcom 11130 ax-addass 11131 ax-mulass 11132 ax-distr 11133 ax-i2m1 11134 ax-1ne0 11135 ax-1rid 11136 ax-rnegex 11137 ax-rrecex 11138 ax-cnre 11139 ax-pre-lttri 11140 ax-pre-lttrn 11141 ax-pre-ltadd 11142 ax-pre-mulgt0 11143 ax-pre-sup 11144 ax-addf 11145 ax-mulf 11146

This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3061 df-ral 3076 df-rex 3086 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4580 df-pr 4582 df-tp 4584 df-op 4586 df-uni 4863 df-int 4903 df-iun 4948 df-iin 4949 df-disj 5065 df-br 5098 df-opab 5160 df-mpt 5179 df-tr 5205 df-id 5538 df-eprel 5543 df-po 5551 df-so 5552 df-fr 5596 df-se 5597 df-we 5598 df-xp 5649 df-rel 5650 df-cnv 5651 df-co 5652 df-dm 5653 df-rn 5654 df-res 5655 df-ima 5656 df-pred 6282 df-ord 6343 df-on 6344 df-lim 6345 df-suc 6346 df-iota 6471 df-fun 6517 df-fn 6518 df-f 6519 df-f1 6520 df-fo 6521 df-f1o 6522 df-fv 6523 df-isom 6524 df-riota 7347 df-ov 7393 df-oprab 7394 df-mpo 7395 df-of 7654 df-om 7841 df-1st 7964 df-2nd 7965 df-supp 8134 df-frecs 8255 df-wrecs 8286 df-recs 8335 df-rdg 8374 df-1o 8430 df-2o 8431 df-er 8671 df-map 8803 df-pm 8804 df-ixp 8873 df-en 8921 df-dom 8922 df-sdom 8923 df-fin 8924 df-fsupp 9301 df-fi 9350 df-sup 9381 df-inf 9382 df-oi 9451 df-dju 9852 df-card 9890 df-acn 9893 df-ac 10065 df-pnf 11211 df-mnf 11212 df-xr 11213 df-ltxr 11214 df-le 11215 df-sub 11409 df-neg 11410 df-div 11838 df-nn 12204 df-2 12273 df-3 12274 df-4 12275 df-5 12276 df-6 12277 df-7 12278 df-8 12279 df-9 12280 df-n0 12475 df-z 12562 df-dec 12682 df-uz 12833 df-q 12943 df-rp 12987 df-xneg 13107 df-xadd 13108 df-xmul 13109 df-ioo 13346 df-ioc 13347 df-ico 13348 df-icc 13349 df-fz 13506 df-fzo 13653 df-fl 13795 df-mod 13873 df-seq 14008 df-exp 14068 df-fac 14280 df-bc 14309 df-hash 14337 df-shft 15073 df-cj 15116 df-re 15117 df-im 15118 df-sqrt 15252 df-abs 15253 df-limsup 15488 df-clim 15505 df-rlim 15506 df-sum 15704 df-ef 16087 df-sin 16089 df-cos 16090 df-pi 16092 df-struct 17173 df-sets 17190 df-slot 17208 df-ndx 17220 df-base 17236 df-ress 17257 df-plusg 17289 df-mulr 17290 df-starv 17291 df-sca 17292 df-vsca 17293 df-ip 17294 df-tset 17295 df-ple 17296 df-ds 17298 df-unif 17299 df-hom 17300 df-cco 17301 df-rest 17441 df-topn 17442 df-0g 17460 df-gsum 17461 df-topgen 17462 df-pt 17463 df-prds 17466 df-ordt 17521 df-xrs 17522 df-qtop 17527 df-imas 17528 df-xps 17530 df-mre 17604 df-mrc 17605 df-acs 17607 df-ps 18588 df-tsr 18589 df-plusf 18663 df-mgm 18664 df-sgrp 18743 df-mnd 18759 df-mhm 18807 df-submnd 18808 df-grp 18968 df-minusg 18969 df-sbg 18970 df-mulg 19100 df-subg 19155 df-cntz 19347 df-cmn 19812 df-abl 19813 df-mgp 20177 df-rng 20189 df-ur 20218 df-ring 20271 df-cring 20272 df-subrng 20582 df-subrg 20606 df-abv 20845 df-lmod 20916 df-scaf 20917 df-sra 21227 df-rgmod 21228 df-psmet 21403 df-xmet 21404 df-met 21405 df-bl 21406 df-mopn 21407 df-fbas 21408 df-fg 21409 df-cnfld 21412 df-top 22941 df-topon 22958 df-topsp 22980 df-bases 22993 df-cld 23066 df-ntr 23067 df-cls 23068 df-nei 23145 df-lp 23183 df-perf 23184 df-cn 23274 df-cnp 23275 df-haus 23362 df-tx 23609 df-hmeo 23802 df-fil 23893 df-fm 23985 df-flim 23986 df-flf 23987 df-tmd 24119 df-tgp 24120 df-tsms 24174 df-trg 24207 df-xms 24367 df-ms 24368 df-tms 24369 df-nm 24629 df-ngp 24630 df-nrg 24632 df-nlm 24633 df-ii 24926 df-cncf 24927 df-limc 25915 df-dv 25916 df-log 26608 df-esum 34285 df-siga 34366 df-meas 34453

This theorem is referenced by: aean 34501

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