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Theorem mbfmco 30842
Description: The composition of two measurable functions is measurable. ( cf. cnmpt11 21795) (Contributed by Thierry Arnoux, 4-Jun-2017.)
Hypotheses
Ref Expression
mbfmco.1 (𝜑𝑅 ran sigAlgebra)
mbfmco.2 (𝜑𝑆 ran sigAlgebra)
mbfmco.3 (𝜑𝑇 ran sigAlgebra)
mbfmco.4 (𝜑𝐹 ∈ (𝑅MblFnM𝑆))
mbfmco.5 (𝜑𝐺 ∈ (𝑆MblFnM𝑇))
Assertion
Ref Expression
mbfmco (𝜑 → (𝐺𝐹) ∈ (𝑅MblFnM𝑇))

Proof of Theorem mbfmco
Dummy variable 𝑎 is distinct from all other variables.
StepHypRef Expression
1 mbfmco.2 . . . . 5 (𝜑𝑆 ran sigAlgebra)
2 mbfmco.3 . . . . 5 (𝜑𝑇 ran sigAlgebra)
3 mbfmco.5 . . . . 5 (𝜑𝐺 ∈ (𝑆MblFnM𝑇))
41, 2, 3mbfmf 30833 . . . 4 (𝜑𝐺: 𝑆 𝑇)
5 mbfmco.1 . . . . 5 (𝜑𝑅 ran sigAlgebra)
6 mbfmco.4 . . . . 5 (𝜑𝐹 ∈ (𝑅MblFnM𝑆))
75, 1, 6mbfmf 30833 . . . 4 (𝜑𝐹: 𝑅 𝑆)
8 fco 6273 . . . 4 ((𝐺: 𝑆 𝑇𝐹: 𝑅 𝑆) → (𝐺𝐹): 𝑅 𝑇)
94, 7, 8syl2anc 580 . . 3 (𝜑 → (𝐺𝐹): 𝑅 𝑇)
10 unielsiga 30707 . . . . 5 (𝑇 ran sigAlgebra → 𝑇𝑇)
112, 10syl 17 . . . 4 (𝜑 𝑇𝑇)
12 unielsiga 30707 . . . . 5 (𝑅 ran sigAlgebra → 𝑅𝑅)
135, 12syl 17 . . . 4 (𝜑 𝑅𝑅)
1411, 13elmapd 8109 . . 3 (𝜑 → ((𝐺𝐹) ∈ ( 𝑇𝑚 𝑅) ↔ (𝐺𝐹): 𝑅 𝑇))
159, 14mpbird 249 . 2 (𝜑 → (𝐺𝐹) ∈ ( 𝑇𝑚 𝑅))
16 cnvco 5511 . . . . . 6 (𝐺𝐹) = (𝐹𝐺)
1716imaeq1i 5680 . . . . 5 ((𝐺𝐹) “ 𝑎) = ((𝐹𝐺) “ 𝑎)
18 imaco 5859 . . . . 5 ((𝐹𝐺) “ 𝑎) = (𝐹 “ (𝐺𝑎))
1917, 18eqtri 2821 . . . 4 ((𝐺𝐹) “ 𝑎) = (𝐹 “ (𝐺𝑎))
205adantr 473 . . . . 5 ((𝜑𝑎𝑇) → 𝑅 ran sigAlgebra)
211adantr 473 . . . . 5 ((𝜑𝑎𝑇) → 𝑆 ran sigAlgebra)
226adantr 473 . . . . 5 ((𝜑𝑎𝑇) → 𝐹 ∈ (𝑅MblFnM𝑆))
232adantr 473 . . . . . 6 ((𝜑𝑎𝑇) → 𝑇 ran sigAlgebra)
243adantr 473 . . . . . 6 ((𝜑𝑎𝑇) → 𝐺 ∈ (𝑆MblFnM𝑇))
25 simpr 478 . . . . . 6 ((𝜑𝑎𝑇) → 𝑎𝑇)
2621, 23, 24, 25mbfmcnvima 30835 . . . . 5 ((𝜑𝑎𝑇) → (𝐺𝑎) ∈ 𝑆)
2720, 21, 22, 26mbfmcnvima 30835 . . . 4 ((𝜑𝑎𝑇) → (𝐹 “ (𝐺𝑎)) ∈ 𝑅)
2819, 27syl5eqel 2882 . . 3 ((𝜑𝑎𝑇) → ((𝐺𝐹) “ 𝑎) ∈ 𝑅)
2928ralrimiva 3147 . 2 (𝜑 → ∀𝑎𝑇 ((𝐺𝐹) “ 𝑎) ∈ 𝑅)
305, 2ismbfm 30830 . 2 (𝜑 → ((𝐺𝐹) ∈ (𝑅MblFnM𝑇) ↔ ((𝐺𝐹) ∈ ( 𝑇𝑚 𝑅) ∧ ∀𝑎𝑇 ((𝐺𝐹) “ 𝑎) ∈ 𝑅)))
3115, 29, 30mpbir2and 705 1 (𝜑 → (𝐺𝐹) ∈ (𝑅MblFnM𝑇))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 385  wcel 2157  wral 3089   cuni 4628  ccnv 5311  ran crn 5313  cima 5315  ccom 5316  wf 6097  (class class class)co 6878  𝑚 cmap 8095  sigAlgebracsiga 30686  MblFnMcmbfm 30828
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1891  ax-4 1905  ax-5 2006  ax-6 2072  ax-7 2107  ax-8 2159  ax-9 2166  ax-10 2185  ax-11 2200  ax-12 2213  ax-13 2377  ax-ext 2777  ax-sep 4975  ax-nul 4983  ax-pow 5035  ax-pr 5097  ax-un 7183
This theorem depends on definitions:  df-bi 199  df-an 386  df-or 875  df-3an 1110  df-tru 1657  df-fal 1667  df-ex 1876  df-nf 1880  df-sb 2065  df-mo 2591  df-eu 2609  df-clab 2786  df-cleq 2792  df-clel 2795  df-nfc 2930  df-ne 2972  df-ral 3094  df-rex 3095  df-rab 3098  df-v 3387  df-sbc 3634  df-csb 3729  df-dif 3772  df-un 3774  df-in 3776  df-ss 3783  df-nul 4116  df-if 4278  df-pw 4351  df-sn 4369  df-pr 4371  df-op 4375  df-uni 4629  df-iun 4712  df-br 4844  df-opab 4906  df-mpt 4923  df-id 5220  df-xp 5318  df-rel 5319  df-cnv 5320  df-co 5321  df-dm 5322  df-rn 5323  df-res 5324  df-ima 5325  df-iota 6064  df-fun 6103  df-fn 6104  df-f 6105  df-fv 6109  df-ov 6881  df-oprab 6882  df-mpt2 6883  df-1st 7401  df-2nd 7402  df-map 8097  df-siga 30687  df-mbfm 30829
This theorem is referenced by:  rrvadd  31031  rrvmulc  31032
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