measxun2 - Mathbox for Thierry Arnoux

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Theorem measxun2 30051

Description: The measure the union of two complementary sets is the sum of their measures. (Contributed by Thierry Arnoux, 10-Mar-2017.)

**Assertion**
Ref	Expression
measxun2	⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → (𝑀‘𝐴) = ((𝑀‘𝐵) +_𝑒 (𝑀‘(𝐴 ∖ 𝐵))))

Proof of Theorem measxun2 Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		simp1 1059	. . 3 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → 𝑀 ∈ (measures‘𝑆))
2		simp2r 1086	. . . 4 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → 𝐵 ∈ 𝑆)
3		measbase 30038	. . . . . 6 ⊢ (𝑀 ∈ (measures‘𝑆) → 𝑆 ∈ ∪ ran sigAlgebra)
4	1, 3	syl 17	. . . . 5 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → 𝑆 ∈ ∪ ran sigAlgebra)
5		simp2l 1085	. . . . 5 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → 𝐴 ∈ 𝑆)
6		difelsiga 29974	. . . . 5 ⊢ ((𝑆 ∈ ∪ ran sigAlgebra ∧ 𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) → (𝐴 ∖ 𝐵) ∈ 𝑆)
7	4, 5, 2, 6	syl3anc 1323	. . . 4 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → (𝐴 ∖ 𝐵) ∈ 𝑆)
8		prelpwi 4876	. . . 4 ⊢ ((𝐵 ∈ 𝑆 ∧ (𝐴 ∖ 𝐵) ∈ 𝑆) → {𝐵, (𝐴 ∖ 𝐵)} ∈ 𝒫 𝑆)
9	2, 7, 8	syl2anc 692	. . 3 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → {𝐵, (𝐴 ∖ 𝐵)} ∈ 𝒫 𝑆)
10		prct 29332	. . . . 5 ⊢ ((𝐵 ∈ 𝑆 ∧ (𝐴 ∖ 𝐵) ∈ 𝑆) → {𝐵, (𝐴 ∖ 𝐵)} ≼ ω)
11	2, 7, 10	syl2anc 692	. . . 4 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → {𝐵, (𝐴 ∖ 𝐵)} ≼ ω)
12		simp3 1061	. . . . 5 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → 𝐵 ⊆ 𝐴)
13		disjdifprg2 29231	. . . . . 6 ⊢ (𝐴 ∈ 𝑆 → Disj 𝑥 ∈ {(𝐴 ∖ 𝐵), (𝐴 ∩ 𝐵)}𝑥)
14		prcom 4237	. . . . . . . . 9 ⊢ {(𝐴 ∖ 𝐵), 𝐵} = {𝐵, (𝐴 ∖ 𝐵)}
15		dfss 3570	. . . . . . . . . . . 12 ⊢ (𝐵 ⊆ 𝐴 ↔ 𝐵 = (𝐵 ∩ 𝐴))
16	15	biimpi 206	. . . . . . . . . . 11 ⊢ (𝐵 ⊆ 𝐴 → 𝐵 = (𝐵 ∩ 𝐴))
17		incom 3783	. . . . . . . . . . 11 ⊢ (𝐵 ∩ 𝐴) = (𝐴 ∩ 𝐵)
18	16, 17	syl6eq 2671	. . . . . . . . . 10 ⊢ (𝐵 ⊆ 𝐴 → 𝐵 = (𝐴 ∩ 𝐵))
19	18	preq2d 4245	. . . . . . . . 9 ⊢ (𝐵 ⊆ 𝐴 → {(𝐴 ∖ 𝐵), 𝐵} = {(𝐴 ∖ 𝐵), (𝐴 ∩ 𝐵)})
20	14, 19	syl5eqr 2669	. . . . . . . 8 ⊢ (𝐵 ⊆ 𝐴 → {𝐵, (𝐴 ∖ 𝐵)} = {(𝐴 ∖ 𝐵), (𝐴 ∩ 𝐵)})
21	20	disjeq1d 4591	. . . . . . 7 ⊢ (𝐵 ⊆ 𝐴 → (Disj 𝑥 ∈ {𝐵, (𝐴 ∖ 𝐵)}𝑥 ↔ Disj 𝑥 ∈ {(𝐴 ∖ 𝐵), (𝐴 ∩ 𝐵)}𝑥))
22	21	biimprd 238	. . . . . 6 ⊢ (𝐵 ⊆ 𝐴 → (Disj 𝑥 ∈ {(𝐴 ∖ 𝐵), (𝐴 ∩ 𝐵)}𝑥 → Disj 𝑥 ∈ {𝐵, (𝐴 ∖ 𝐵)}𝑥))
23	13, 22	mpan9 486	. . . . 5 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝐵 ⊆ 𝐴) → Disj 𝑥 ∈ {𝐵, (𝐴 ∖ 𝐵)}𝑥)
24	5, 12, 23	syl2anc 692	. . . 4 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → Disj 𝑥 ∈ {𝐵, (𝐴 ∖ 𝐵)}𝑥)
25	11, 24	jca 554	. . 3 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → ({𝐵, (𝐴 ∖ 𝐵)} ≼ ω ∧ Disj 𝑥 ∈ {𝐵, (𝐴 ∖ 𝐵)}𝑥))
26		measvun 30050	. . 3 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ {𝐵, (𝐴 ∖ 𝐵)} ∈ 𝒫 𝑆 ∧ ({𝐵, (𝐴 ∖ 𝐵)} ≼ ω ∧ Disj 𝑥 ∈ {𝐵, (𝐴 ∖ 𝐵)}𝑥)) → (𝑀‘∪ {𝐵, (𝐴 ∖ 𝐵)}) = Σ^*𝑥 ∈ {𝐵, (𝐴 ∖ 𝐵)} (𝑀‘𝑥))
27	1, 9, 25, 26	syl3anc 1323	. 2 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → (𝑀‘∪ {𝐵, (𝐴 ∖ 𝐵)}) = Σ^*𝑥 ∈ {𝐵, (𝐴 ∖ 𝐵)} (𝑀‘𝑥))
28	2, 7	jca 554	. . 3 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → (𝐵 ∈ 𝑆 ∧ (𝐴 ∖ 𝐵) ∈ 𝑆))
29		uniprg 4416	. . . . 5 ⊢ ((𝐵 ∈ 𝑆 ∧ (𝐴 ∖ 𝐵) ∈ 𝑆) → ∪ {𝐵, (𝐴 ∖ 𝐵)} = (𝐵 ∪ (𝐴 ∖ 𝐵)))
30		undif 4021	. . . . . 6 ⊢ (𝐵 ⊆ 𝐴 ↔ (𝐵 ∪ (𝐴 ∖ 𝐵)) = 𝐴)
31	30	biimpi 206	. . . . 5 ⊢ (𝐵 ⊆ 𝐴 → (𝐵 ∪ (𝐴 ∖ 𝐵)) = 𝐴)
32	29, 31	sylan9eq 2675	. . . 4 ⊢ (((𝐵 ∈ 𝑆 ∧ (𝐴 ∖ 𝐵) ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → ∪ {𝐵, (𝐴 ∖ 𝐵)} = 𝐴)
33	32	fveq2d 6152	. . 3 ⊢ (((𝐵 ∈ 𝑆 ∧ (𝐴 ∖ 𝐵) ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → (𝑀‘∪ {𝐵, (𝐴 ∖ 𝐵)}) = (𝑀‘𝐴))
34	28, 12, 33	syl2anc 692	. 2 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → (𝑀‘∪ {𝐵, (𝐴 ∖ 𝐵)}) = (𝑀‘𝐴))
35		simpr 477	. . . 4 ⊢ (((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 = 𝐵) → 𝑥 = 𝐵)
36	35	fveq2d 6152	. . 3 ⊢ (((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 = 𝐵) → (𝑀‘𝑥) = (𝑀‘𝐵))
37		simpr 477	. . . 4 ⊢ (((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 = (𝐴 ∖ 𝐵)) → 𝑥 = (𝐴 ∖ 𝐵))
38	37	fveq2d 6152	. . 3 ⊢ (((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 = (𝐴 ∖ 𝐵)) → (𝑀‘𝑥) = (𝑀‘(𝐴 ∖ 𝐵)))
39		measvxrge0 30046	. . . 4 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ 𝐵 ∈ 𝑆) → (𝑀‘𝐵) ∈ (0[,]+∞))
40	1, 2, 39	syl2anc 692	. . 3 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → (𝑀‘𝐵) ∈ (0[,]+∞))
41		measvxrge0 30046	. . . 4 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∖ 𝐵) ∈ 𝑆) → (𝑀‘(𝐴 ∖ 𝐵)) ∈ (0[,]+∞))
42	1, 7, 41	syl2anc 692	. . 3 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → (𝑀‘(𝐴 ∖ 𝐵)) ∈ (0[,]+∞))
43		eqimss 3636	. . . . . . . . 9 ⊢ (𝐵 = (𝐴 ∖ 𝐵) → 𝐵 ⊆ (𝐴 ∖ 𝐵))
44		ssdifeq0 4023	. . . . . . . . 9 ⊢ (𝐵 ⊆ (𝐴 ∖ 𝐵) ↔ 𝐵 = ∅)
45	43, 44	sylib 208	. . . . . . . 8 ⊢ (𝐵 = (𝐴 ∖ 𝐵) → 𝐵 = ∅)
46	45	fveq2d 6152	. . . . . . 7 ⊢ (𝐵 = (𝐴 ∖ 𝐵) → (𝑀‘𝐵) = (𝑀‘∅))
47		measvnul 30047	. . . . . . 7 ⊢ (𝑀 ∈ (measures‘𝑆) → (𝑀‘∅) = 0)
48	46, 47	sylan9eqr 2677	. . . . . 6 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ 𝐵 = (𝐴 ∖ 𝐵)) → (𝑀‘𝐵) = 0)
49	1, 48	sylan 488	. . . . 5 ⊢ (((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) ∧ 𝐵 = (𝐴 ∖ 𝐵)) → (𝑀‘𝐵) = 0)
50	49	orcd 407	. . . 4 ⊢ (((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) ∧ 𝐵 = (𝐴 ∖ 𝐵)) → ((𝑀‘𝐵) = 0 ∨ (𝑀‘𝐵) = +∞))
51	50	ex 450	. . 3 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → (𝐵 = (𝐴 ∖ 𝐵) → ((𝑀‘𝐵) = 0 ∨ (𝑀‘𝐵) = +∞)))
52	36, 38, 2, 7, 40, 42, 51	esumpr2 29907	. 2 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → Σ^*𝑥 ∈ {𝐵, (𝐴 ∖ 𝐵)} (𝑀‘𝑥) = ((𝑀‘𝐵) +_𝑒 (𝑀‘(𝐴 ∖ 𝐵))))
53	27, 34, 52	3eqtr3d 2663	1 ⊢ ((𝑀 ∈ (measures‘𝑆) ∧ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) ∧ 𝐵 ⊆ 𝐴) → (𝑀‘𝐴) = ((𝑀‘𝐵) +_𝑒 (𝑀‘(𝐴 ∖ 𝐵))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∨ wo 383 ∧ wa 384 ∧ w3a 1036 = wceq 1480 ∈ wcel 1987 ∖ cdif 3552 ∪ cun 3553 ∩ cin 3554 ⊆ wss 3555 ∅c0 3891 𝒫 cpw 4130 {cpr 4150 ∪ cuni 4402 Disj wdisj 4583 class class class wbr 4613 ran crn 5075 ‘cfv 5847 (class class class)co 6604 ωcom 7012 ≼ cdom 7897 0cc0 9880 +∞cpnf 10015 +_𝑒 cxad 11888 [,]cicc 12120 Σ^*cesum 29867 sigAlgebracsiga 29948 measurescmeas 30036

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1719 ax-4 1734 ax-5 1836 ax-6 1885 ax-7 1932 ax-8 1989 ax-9 1996 ax-10 2016 ax-11 2031 ax-12 2044 ax-13 2245 ax-ext 2601 ax-rep 4731 ax-sep 4741 ax-nul 4749 ax-pow 4803 ax-pr 4867 ax-un 6902 ax-inf2 8482 ax-ac2 9229 ax-cnex 9936 ax-resscn 9937 ax-1cn 9938 ax-icn 9939 ax-addcl 9940 ax-addrcl 9941 ax-mulcl 9942 ax-mulrcl 9943 ax-mulcom 9944 ax-addass 9945 ax-mulass 9946 ax-distr 9947 ax-i2m1 9948 ax-1ne0 9949 ax-1rid 9950 ax-rnegex 9951 ax-rrecex 9952 ax-cnre 9953 ax-pre-lttri 9954 ax-pre-lttrn 9955 ax-pre-ltadd 9956 ax-pre-mulgt0 9957 ax-pre-sup 9958 ax-addf 9959 ax-mulf 9960

This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3or 1037 df-3an 1038 df-tru 1483 df-fal 1486 df-ex 1702 df-nf 1707 df-sb 1878 df-eu 2473 df-mo 2474 df-clab 2608 df-cleq 2614 df-clel 2617 df-nfc 2750 df-ne 2791 df-nel 2894 df-ral 2912 df-rex 2913 df-reu 2914 df-rmo 2915 df-rab 2916 df-v 3188 df-sbc 3418 df-csb 3515 df-dif 3558 df-un 3560 df-in 3562 df-ss 3569 df-pss 3571 df-nul 3892 df-if 4059 df-pw 4132 df-sn 4149 df-pr 4151 df-tp 4153 df-op 4155 df-uni 4403 df-int 4441 df-iun 4487 df-iin 4488 df-disj 4584 df-br 4614 df-opab 4674 df-mpt 4675 df-tr 4713 df-eprel 4985 df-id 4989 df-po 4995 df-so 4996 df-fr 5033 df-se 5034 df-we 5035 df-xp 5080 df-rel 5081 df-cnv 5082 df-co 5083 df-dm 5084 df-rn 5085 df-res 5086 df-ima 5087 df-pred 5639 df-ord 5685 df-on 5686 df-lim 5687 df-suc 5688 df-iota 5810 df-fun 5849 df-fn 5850 df-f 5851 df-f1 5852 df-fo 5853 df-f1o 5854 df-fv 5855 df-isom 5856 df-riota 6565 df-ov 6607 df-oprab 6608 df-mpt2 6609 df-of 6850 df-om 7013 df-1st 7113 df-2nd 7114 df-supp 7241 df-wrecs 7352 df-recs 7413 df-rdg 7451 df-1o 7505 df-2o 7506 df-oadd 7509 df-er 7687 df-map 7804 df-pm 7805 df-ixp 7853 df-en 7900 df-dom 7901 df-sdom 7902 df-fin 7903 df-fsupp 8220 df-fi 8261 df-sup 8292 df-inf 8293 df-oi 8359 df-card 8709 df-acn 8712 df-ac 8883 df-cda 8934 df-pnf 10020 df-mnf 10021 df-xr 10022 df-ltxr 10023 df-le 10024 df-sub 10212 df-neg 10213 df-div 10629 df-nn 10965 df-2 11023 df-3 11024 df-4 11025 df-5 11026 df-6 11027 df-7 11028 df-8 11029 df-9 11030 df-n0 11237 df-z 11322 df-dec 11438 df-uz 11632 df-q 11733 df-rp 11777 df-xneg 11890 df-xadd 11891 df-xmul 11892 df-ioo 12121 df-ioc 12122 df-ico 12123 df-icc 12124 df-fz 12269 df-fzo 12407 df-fl 12533 df-mod 12609 df-seq 12742 df-exp 12801 df-fac 13001 df-bc 13030 df-hash 13058 df-shft 13741 df-cj 13773 df-re 13774 df-im 13775 df-sqrt 13909 df-abs 13910 df-limsup 14136 df-clim 14153 df-rlim 14154 df-sum 14351 df-ef 14723 df-sin 14725 df-cos 14726 df-pi 14728 df-struct 15783 df-ndx 15784 df-slot 15785 df-base 15786 df-sets 15787 df-ress 15788 df-plusg 15875 df-mulr 15876 df-starv 15877 df-sca 15878 df-vsca 15879 df-ip 15880 df-tset 15881 df-ple 15882 df-ds 15885 df-unif 15886 df-hom 15887 df-cco 15888 df-rest 16004 df-topn 16005 df-0g 16023 df-gsum 16024 df-topgen 16025 df-pt 16026 df-prds 16029 df-ordt 16082 df-xrs 16083 df-qtop 16088 df-imas 16089 df-xps 16091 df-mre 16167 df-mrc 16168 df-acs 16170 df-ps 17121 df-tsr 17122 df-plusf 17162 df-mgm 17163 df-sgrp 17205 df-mnd 17216 df-mhm 17256 df-submnd 17257 df-grp 17346 df-minusg 17347 df-sbg 17348 df-mulg 17462 df-subg 17512 df-cntz 17671 df-cmn 18116 df-abl 18117 df-mgp 18411 df-ur 18423 df-ring 18470 df-cring 18471 df-subrg 18699 df-abv 18738 df-lmod 18786 df-scaf 18787 df-sra 19091 df-rgmod 19092 df-psmet 19657 df-xmet 19658 df-met 19659 df-bl 19660 df-mopn 19661 df-fbas 19662 df-fg 19663 df-cnfld 19666 df-top 20621 df-bases 20622 df-topon 20623 df-topsp 20624 df-cld 20733 df-ntr 20734 df-cls 20735 df-nei 20812 df-lp 20850 df-perf 20851 df-cn 20941 df-cnp 20942 df-haus 21029 df-tx 21275 df-hmeo 21468 df-fil 21560 df-fm 21652 df-flim 21653 df-flf 21654 df-tmd 21786 df-tgp 21787 df-tsms 21840 df-trg 21873 df-xms 22035 df-ms 22036 df-tms 22037 df-nm 22297 df-ngp 22298 df-nrg 22300 df-nlm 22301 df-ii 22588 df-cncf 22589 df-limc 23536 df-dv 23537 df-log 24207 df-esum 29868 df-siga 29949 df-meas 30037

This theorem is referenced by: measun 30052

W3C validator