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Theorem difelsiga 30001
 Description: A sigma-algebra is closed under class differences. (Contributed by Thierry Arnoux, 13-Sep-2016.)
Assertion
Ref Expression
difelsiga ((𝑆 ran sigAlgebra ∧ 𝐴𝑆𝐵𝑆) → (𝐴𝐵) ∈ 𝑆)

Proof of Theorem difelsiga
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 simp2 1060 . . . 4 ((𝑆 ran sigAlgebra ∧ 𝐴𝑆𝐵𝑆) → 𝐴𝑆)
2 elssuni 4438 . . . 4 (𝐴𝑆𝐴 𝑆)
3 difin2 3871 . . . 4 (𝐴 𝑆 → (𝐴𝐵) = (( 𝑆𝐵) ∩ 𝐴))
41, 2, 33syl 18 . . 3 ((𝑆 ran sigAlgebra ∧ 𝐴𝑆𝐵𝑆) → (𝐴𝐵) = (( 𝑆𝐵) ∩ 𝐴))
5 isrnsigau 29995 . . . . . . . 8 (𝑆 ran sigAlgebra → (𝑆 ⊆ 𝒫 𝑆 ∧ ( 𝑆𝑆 ∧ ∀𝑥𝑆 ( 𝑆𝑥) ∈ 𝑆 ∧ ∀𝑥 ∈ 𝒫 𝑆(𝑥 ≼ ω → 𝑥𝑆))))
65simprd 479 . . . . . . 7 (𝑆 ran sigAlgebra → ( 𝑆𝑆 ∧ ∀𝑥𝑆 ( 𝑆𝑥) ∈ 𝑆 ∧ ∀𝑥 ∈ 𝒫 𝑆(𝑥 ≼ ω → 𝑥𝑆)))
76simp2d 1072 . . . . . 6 (𝑆 ran sigAlgebra → ∀𝑥𝑆 ( 𝑆𝑥) ∈ 𝑆)
8 difeq2 3705 . . . . . . . 8 (𝑥 = 𝐵 → ( 𝑆𝑥) = ( 𝑆𝐵))
98eleq1d 2683 . . . . . . 7 (𝑥 = 𝐵 → (( 𝑆𝑥) ∈ 𝑆 ↔ ( 𝑆𝐵) ∈ 𝑆))
109rspccva 3297 . . . . . 6 ((∀𝑥𝑆 ( 𝑆𝑥) ∈ 𝑆𝐵𝑆) → ( 𝑆𝐵) ∈ 𝑆)
117, 10sylan 488 . . . . 5 ((𝑆 ran sigAlgebra ∧ 𝐵𝑆) → ( 𝑆𝐵) ∈ 𝑆)
12113adant2 1078 . . . 4 ((𝑆 ran sigAlgebra ∧ 𝐴𝑆𝐵𝑆) → ( 𝑆𝐵) ∈ 𝑆)
13 intprg 4481 . . . 4 ((( 𝑆𝐵) ∈ 𝑆𝐴𝑆) → {( 𝑆𝐵), 𝐴} = (( 𝑆𝐵) ∩ 𝐴))
1412, 1, 13syl2anc 692 . . 3 ((𝑆 ran sigAlgebra ∧ 𝐴𝑆𝐵𝑆) → {( 𝑆𝐵), 𝐴} = (( 𝑆𝐵) ∩ 𝐴))
154, 14eqtr4d 2658 . 2 ((𝑆 ran sigAlgebra ∧ 𝐴𝑆𝐵𝑆) → (𝐴𝐵) = {( 𝑆𝐵), 𝐴})
16 simp1 1059 . . 3 ((𝑆 ran sigAlgebra ∧ 𝐴𝑆𝐵𝑆) → 𝑆 ran sigAlgebra)
17 prssi 4326 . . . . 5 ((( 𝑆𝐵) ∈ 𝑆𝐴𝑆) → {( 𝑆𝐵), 𝐴} ⊆ 𝑆)
1812, 1, 17syl2anc 692 . . . 4 ((𝑆 ran sigAlgebra ∧ 𝐴𝑆𝐵𝑆) → {( 𝑆𝐵), 𝐴} ⊆ 𝑆)
19 prex 4875 . . . . 5 {( 𝑆𝐵), 𝐴} ∈ V
2019elpw 4141 . . . 4 ({( 𝑆𝐵), 𝐴} ∈ 𝒫 𝑆 ↔ {( 𝑆𝐵), 𝐴} ⊆ 𝑆)
2118, 20sylibr 224 . . 3 ((𝑆 ran sigAlgebra ∧ 𝐴𝑆𝐵𝑆) → {( 𝑆𝐵), 𝐴} ∈ 𝒫 𝑆)
22 prct 29358 . . . 4 ((( 𝑆𝐵) ∈ 𝑆𝐴𝑆) → {( 𝑆𝐵), 𝐴} ≼ ω)
2312, 1, 22syl2anc 692 . . 3 ((𝑆 ran sigAlgebra ∧ 𝐴𝑆𝐵𝑆) → {( 𝑆𝐵), 𝐴} ≼ ω)
24 prnzg 4286 . . . 4 (( 𝑆𝐵) ∈ 𝑆 → {( 𝑆𝐵), 𝐴} ≠ ∅)
2512, 24syl 17 . . 3 ((𝑆 ran sigAlgebra ∧ 𝐴𝑆𝐵𝑆) → {( 𝑆𝐵), 𝐴} ≠ ∅)
26 sigaclci 30000 . . 3 (((𝑆 ran sigAlgebra ∧ {( 𝑆𝐵), 𝐴} ∈ 𝒫 𝑆) ∧ ({( 𝑆𝐵), 𝐴} ≼ ω ∧ {( 𝑆𝐵), 𝐴} ≠ ∅)) → {( 𝑆𝐵), 𝐴} ∈ 𝑆)
2716, 21, 23, 25, 26syl22anc 1324 . 2 ((𝑆 ran sigAlgebra ∧ 𝐴𝑆𝐵𝑆) → {( 𝑆𝐵), 𝐴} ∈ 𝑆)
2815, 27eqeltrd 2698 1 ((𝑆 ran sigAlgebra ∧ 𝐴𝑆𝐵𝑆) → (𝐴𝐵) ∈ 𝑆)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ w3a 1036   = wceq 1480   ∈ wcel 1987   ≠ wne 2790  ∀wral 2907   ∖ cdif 3556   ∩ cin 3558   ⊆ wss 3559  ∅c0 3896  𝒫 cpw 4135  {cpr 4155  ∪ cuni 4407  ∩ cint 4445   class class class wbr 4618  ran crn 5080  ωcom 7019   ≼ cdom 7905  sigAlgebracsiga 29975 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 4736  ax-sep 4746  ax-nul 4754  ax-pow 4808  ax-pr 4872  ax-un 6909  ax-inf2 8490  ax-ac2 9237 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-ral 2912  df-rex 2913  df-reu 2914  df-rmo 2915  df-rab 2916  df-v 3191  df-sbc 3422  df-csb 3519  df-dif 3562  df-un 3564  df-in 3566  df-ss 3573  df-pss 3575  df-nul 3897  df-if 4064  df-pw 4137  df-sn 4154  df-pr 4156  df-tp 4158  df-op 4160  df-uni 4408  df-int 4446  df-iun 4492  df-iin 4493  df-br 4619  df-opab 4679  df-mpt 4680  df-tr 4718  df-eprel 4990  df-id 4994  df-po 5000  df-so 5001  df-fr 5038  df-se 5039  df-we 5040  df-xp 5085  df-rel 5086  df-cnv 5087  df-co 5088  df-dm 5089  df-rn 5090  df-res 5091  df-ima 5092  df-pred 5644  df-ord 5690  df-on 5691  df-lim 5692  df-suc 5693  df-iota 5815  df-fun 5854  df-fn 5855  df-f 5856  df-f1 5857  df-fo 5858  df-f1o 5859  df-fv 5860  df-isom 5861  df-riota 6571  df-ov 6613  df-oprab 6614  df-mpt2 6615  df-om 7020  df-1st 7120  df-2nd 7121  df-wrecs 7359  df-recs 7420  df-rdg 7458  df-1o 7512  df-2o 7513  df-oadd 7516  df-er 7694  df-map 7811  df-en 7908  df-dom 7909  df-sdom 7910  df-fin 7911  df-oi 8367  df-card 8717  df-acn 8720  df-ac 8891  df-cda 8942  df-siga 29976 This theorem is referenced by:  inelsiga  30003  sigainb  30004  sigaldsys  30027  cldssbrsiga  30055  measxun2  30078  measssd  30083  measunl  30084  measiuns  30085  measiun  30086  meascnbl  30087  imambfm  30129  dya2iocbrsiga  30142  dya2icobrsiga  30143  sxbrsigalem2  30153  probdif  30287
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