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Theorem mbfmco2 30108
Description: The pair building of two measurable functions is measurable. ( cf. cnmpt1t 21378). (Contributed by Thierry Arnoux, 6-Jun-2017.)
Hypotheses
Ref Expression
mbfmco.1 (𝜑𝑅 ran sigAlgebra)
mbfmco.2 (𝜑𝑆 ran sigAlgebra)
mbfmco.3 (𝜑𝑇 ran sigAlgebra)
mbfmco2.4 (𝜑𝐹 ∈ (𝑅MblFnM𝑆))
mbfmco2.5 (𝜑𝐺 ∈ (𝑅MblFnM𝑇))
mbfmco2.6 𝐻 = (𝑥 𝑅 ↦ ⟨(𝐹𝑥), (𝐺𝑥)⟩)
Assertion
Ref Expression
mbfmco2 (𝜑𝐻 ∈ (𝑅MblFnM(𝑆 ×s 𝑇)))
Distinct variable groups:   𝑥,𝑅   𝑥,𝑆   𝑥,𝑇   𝜑,𝑥   𝑥,𝐹   𝑥,𝐺   𝑥,𝐻

Proof of Theorem mbfmco2
Dummy variables 𝑎 𝑏 𝑐 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 mbfmco.1 . . . . . . 7 (𝜑𝑅 ran sigAlgebra)
2 mbfmco.2 . . . . . . 7 (𝜑𝑆 ran sigAlgebra)
3 mbfmco2.4 . . . . . . 7 (𝜑𝐹 ∈ (𝑅MblFnM𝑆))
41, 2, 3mbfmf 30098 . . . . . 6 (𝜑𝐹: 𝑅 𝑆)
54ffvelrnda 6315 . . . . 5 ((𝜑𝑥 𝑅) → (𝐹𝑥) ∈ 𝑆)
6 mbfmco.3 . . . . . . 7 (𝜑𝑇 ran sigAlgebra)
7 mbfmco2.5 . . . . . . 7 (𝜑𝐺 ∈ (𝑅MblFnM𝑇))
81, 6, 7mbfmf 30098 . . . . . 6 (𝜑𝐺: 𝑅 𝑇)
98ffvelrnda 6315 . . . . 5 ((𝜑𝑥 𝑅) → (𝐺𝑥) ∈ 𝑇)
10 opelxpi 5108 . . . . 5 (((𝐹𝑥) ∈ 𝑆 ∧ (𝐺𝑥) ∈ 𝑇) → ⟨(𝐹𝑥), (𝐺𝑥)⟩ ∈ ( 𝑆 × 𝑇))
115, 9, 10syl2anc 692 . . . 4 ((𝜑𝑥 𝑅) → ⟨(𝐹𝑥), (𝐺𝑥)⟩ ∈ ( 𝑆 × 𝑇))
12 sxuni 30037 . . . . . 6 ((𝑆 ran sigAlgebra ∧ 𝑇 ran sigAlgebra) → ( 𝑆 × 𝑇) = (𝑆 ×s 𝑇))
132, 6, 12syl2anc 692 . . . . 5 (𝜑 → ( 𝑆 × 𝑇) = (𝑆 ×s 𝑇))
1413adantr 481 . . . 4 ((𝜑𝑥 𝑅) → ( 𝑆 × 𝑇) = (𝑆 ×s 𝑇))
1511, 14eleqtrd 2700 . . 3 ((𝜑𝑥 𝑅) → ⟨(𝐹𝑥), (𝐺𝑥)⟩ ∈ (𝑆 ×s 𝑇))
16 mbfmco2.6 . . 3 𝐻 = (𝑥 𝑅 ↦ ⟨(𝐹𝑥), (𝐺𝑥)⟩)
1715, 16fmptd 6340 . 2 (𝜑𝐻: 𝑅 (𝑆 ×s 𝑇))
18 eqid 2621 . . . . 5 (𝑎𝑆, 𝑏𝑇 ↦ (𝑎 × 𝑏)) = (𝑎𝑆, 𝑏𝑇 ↦ (𝑎 × 𝑏))
19 vex 3189 . . . . . 6 𝑎 ∈ V
20 vex 3189 . . . . . 6 𝑏 ∈ V
2119, 20xpex 6915 . . . . 5 (𝑎 × 𝑏) ∈ V
2218, 21elrnmpt2 6726 . . . 4 (𝑐 ∈ ran (𝑎𝑆, 𝑏𝑇 ↦ (𝑎 × 𝑏)) ↔ ∃𝑎𝑆𝑏𝑇 𝑐 = (𝑎 × 𝑏))
23 simp3 1061 . . . . . . . . 9 ((𝜑 ∧ (𝑎𝑆𝑏𝑇) ∧ 𝑐 = (𝑎 × 𝑏)) → 𝑐 = (𝑎 × 𝑏))
2423imaeq2d 5425 . . . . . . . 8 ((𝜑 ∧ (𝑎𝑆𝑏𝑇) ∧ 𝑐 = (𝑎 × 𝑏)) → (𝐻𝑐) = (𝐻 “ (𝑎 × 𝑏)))
25 simp1 1059 . . . . . . . . 9 ((𝜑 ∧ (𝑎𝑆𝑏𝑇) ∧ 𝑐 = (𝑎 × 𝑏)) → 𝜑)
26 simp2l 1085 . . . . . . . . 9 ((𝜑 ∧ (𝑎𝑆𝑏𝑇) ∧ 𝑐 = (𝑎 × 𝑏)) → 𝑎𝑆)
27 simp2r 1086 . . . . . . . . 9 ((𝜑 ∧ (𝑎𝑆𝑏𝑇) ∧ 𝑐 = (𝑎 × 𝑏)) → 𝑏𝑇)
284, 8, 16xppreima2 29292 . . . . . . . . . . 11 (𝜑 → (𝐻 “ (𝑎 × 𝑏)) = ((𝐹𝑎) ∩ (𝐺𝑏)))
29283ad2ant1 1080 . . . . . . . . . 10 ((𝜑𝑎𝑆𝑏𝑇) → (𝐻 “ (𝑎 × 𝑏)) = ((𝐹𝑎) ∩ (𝐺𝑏)))
3013ad2ant1 1080 . . . . . . . . . . 11 ((𝜑𝑎𝑆𝑏𝑇) → 𝑅 ran sigAlgebra)
3123ad2ant1 1080 . . . . . . . . . . . 12 ((𝜑𝑎𝑆𝑏𝑇) → 𝑆 ran sigAlgebra)
3233ad2ant1 1080 . . . . . . . . . . . 12 ((𝜑𝑎𝑆𝑏𝑇) → 𝐹 ∈ (𝑅MblFnM𝑆))
33 simp2 1060 . . . . . . . . . . . 12 ((𝜑𝑎𝑆𝑏𝑇) → 𝑎𝑆)
3430, 31, 32, 33mbfmcnvima 30100 . . . . . . . . . . 11 ((𝜑𝑎𝑆𝑏𝑇) → (𝐹𝑎) ∈ 𝑅)
3563ad2ant1 1080 . . . . . . . . . . . 12 ((𝜑𝑎𝑆𝑏𝑇) → 𝑇 ran sigAlgebra)
3673ad2ant1 1080 . . . . . . . . . . . 12 ((𝜑𝑎𝑆𝑏𝑇) → 𝐺 ∈ (𝑅MblFnM𝑇))
37 simp3 1061 . . . . . . . . . . . 12 ((𝜑𝑎𝑆𝑏𝑇) → 𝑏𝑇)
3830, 35, 36, 37mbfmcnvima 30100 . . . . . . . . . . 11 ((𝜑𝑎𝑆𝑏𝑇) → (𝐺𝑏) ∈ 𝑅)
39 inelsiga 29979 . . . . . . . . . . 11 ((𝑅 ran sigAlgebra ∧ (𝐹𝑎) ∈ 𝑅 ∧ (𝐺𝑏) ∈ 𝑅) → ((𝐹𝑎) ∩ (𝐺𝑏)) ∈ 𝑅)
4030, 34, 38, 39syl3anc 1323 . . . . . . . . . 10 ((𝜑𝑎𝑆𝑏𝑇) → ((𝐹𝑎) ∩ (𝐺𝑏)) ∈ 𝑅)
4129, 40eqeltrd 2698 . . . . . . . . 9 ((𝜑𝑎𝑆𝑏𝑇) → (𝐻 “ (𝑎 × 𝑏)) ∈ 𝑅)
4225, 26, 27, 41syl3anc 1323 . . . . . . . 8 ((𝜑 ∧ (𝑎𝑆𝑏𝑇) ∧ 𝑐 = (𝑎 × 𝑏)) → (𝐻 “ (𝑎 × 𝑏)) ∈ 𝑅)
4324, 42eqeltrd 2698 . . . . . . 7 ((𝜑 ∧ (𝑎𝑆𝑏𝑇) ∧ 𝑐 = (𝑎 × 𝑏)) → (𝐻𝑐) ∈ 𝑅)
44433expia 1264 . . . . . 6 ((𝜑 ∧ (𝑎𝑆𝑏𝑇)) → (𝑐 = (𝑎 × 𝑏) → (𝐻𝑐) ∈ 𝑅))
4544rexlimdvva 3031 . . . . 5 (𝜑 → (∃𝑎𝑆𝑏𝑇 𝑐 = (𝑎 × 𝑏) → (𝐻𝑐) ∈ 𝑅))
4645imp 445 . . . 4 ((𝜑 ∧ ∃𝑎𝑆𝑏𝑇 𝑐 = (𝑎 × 𝑏)) → (𝐻𝑐) ∈ 𝑅)
4722, 46sylan2b 492 . . 3 ((𝜑𝑐 ∈ ran (𝑎𝑆, 𝑏𝑇 ↦ (𝑎 × 𝑏))) → (𝐻𝑐) ∈ 𝑅)
4847ralrimiva 2960 . 2 (𝜑 → ∀𝑐 ∈ ran (𝑎𝑆, 𝑏𝑇 ↦ (𝑎 × 𝑏))(𝐻𝑐) ∈ 𝑅)
49 eqid 2621 . . . . 5 ran (𝑎𝑆, 𝑏𝑇 ↦ (𝑎 × 𝑏)) = ran (𝑎𝑆, 𝑏𝑇 ↦ (𝑎 × 𝑏))
5049txbasex 21279 . . . 4 ((𝑆 ran sigAlgebra ∧ 𝑇 ran sigAlgebra) → ran (𝑎𝑆, 𝑏𝑇 ↦ (𝑎 × 𝑏)) ∈ V)
512, 6, 50syl2anc 692 . . 3 (𝜑 → ran (𝑎𝑆, 𝑏𝑇 ↦ (𝑎 × 𝑏)) ∈ V)
5249sxval 30034 . . . 4 ((𝑆 ran sigAlgebra ∧ 𝑇 ran sigAlgebra) → (𝑆 ×s 𝑇) = (sigaGen‘ran (𝑎𝑆, 𝑏𝑇 ↦ (𝑎 × 𝑏))))
532, 6, 52syl2anc 692 . . 3 (𝜑 → (𝑆 ×s 𝑇) = (sigaGen‘ran (𝑎𝑆, 𝑏𝑇 ↦ (𝑎 × 𝑏))))
5451, 1, 53imambfm 30105 . 2 (𝜑 → (𝐻 ∈ (𝑅MblFnM(𝑆 ×s 𝑇)) ↔ (𝐻: 𝑅 (𝑆 ×s 𝑇) ∧ ∀𝑐 ∈ ran (𝑎𝑆, 𝑏𝑇 ↦ (𝑎 × 𝑏))(𝐻𝑐) ∈ 𝑅)))
5517, 48, 54mpbir2and 956 1 (𝜑𝐻 ∈ (𝑅MblFnM(𝑆 ×s 𝑇)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 384  w3a 1036   = wceq 1480  wcel 1987  wral 2907  wrex 2908  Vcvv 3186  cin 3554  cop 4154   cuni 4402  cmpt 4673   × cxp 5072  ccnv 5073  ran crn 5075  cima 5077  wf 5843  cfv 5847  (class class class)co 6604  cmpt2 6606  sigAlgebracsiga 29951  sigaGencsigagen 29982   ×s csx 30032  MblFnMcmbfm 30093
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
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 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-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-om 7013  df-1st 7113  df-2nd 7114  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-en 7900  df-dom 7901  df-sdom 7902  df-fin 7903  df-oi 8359  df-card 8709  df-acn 8712  df-ac 8883  df-cda 8934  df-siga 29952  df-sigagen 29983  df-sx 30033  df-mbfm 30094
This theorem is referenced by:  rrvadd  30295
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