Theorem cnmbfm 32226

Description: A continuous function is measurable with respect to the Borel Algebra of its domain and range. (Contributed by Thierry Arnoux, 3-Jun-2017.)

Hypotheses

Ref	Expression
cnmbfm.1	⊢ (𝜑 → 𝐹 ∈ (𝐽 Cn 𝐾))
cnmbfm.2	⊢ (𝜑 → 𝑆 = (sigaGen‘𝐽))
cnmbfm.3	⊢ (𝜑 → 𝑇 = (sigaGen‘𝐾))

Assertion

Ref	Expression
cnmbfm	⊢ (𝜑 → 𝐹 ∈ (𝑆MblFnM𝑇))

Proof of Theorem cnmbfm

Dummy variable 𝑎 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		cnmbfm.1	. . . 4 ⊢ (𝜑 → 𝐹 ∈ (𝐽 Cn 𝐾))
2		eqid 2740	. . . . 5 ⊢ ∪ 𝐽 = ∪ 𝐽
3		eqid 2740	. . . . 5 ⊢ ∪ 𝐾 = ∪ 𝐾
4	2, 3	cnf 22395	. . . 4 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐹:∪ 𝐽⟶∪ 𝐾)
5	1, 4	syl 17	. . 3 ⊢ (𝜑 → 𝐹:∪ 𝐽⟶∪ 𝐾)
6		cnmbfm.2	. . . . . 6 ⊢ (𝜑 → 𝑆 = (sigaGen‘𝐽))
7	6	unieqd 4859	. . . . 5 ⊢ (𝜑 → ∪ 𝑆 = ∪ (sigaGen‘𝐽))
8		cntop1 22389	. . . . . 6 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐽 ∈ Top)
9		unisg 32107	. . . . . 6 ⊢ (𝐽 ∈ Top → ∪ (sigaGen‘𝐽) = ∪ 𝐽)
10	1, 8, 9	3syl 18	. . . . 5 ⊢ (𝜑 → ∪ (sigaGen‘𝐽) = ∪ 𝐽)
11	7, 10	eqtrd 2780	. . . 4 ⊢ (𝜑 → ∪ 𝑆 = ∪ 𝐽)
12		cnmbfm.3	. . . . . 6 ⊢ (𝜑 → 𝑇 = (sigaGen‘𝐾))
13	12	unieqd 4859	. . . . 5 ⊢ (𝜑 → ∪ 𝑇 = ∪ (sigaGen‘𝐾))
14		cntop2 22390	. . . . . 6 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐾 ∈ Top)
15		unisg 32107	. . . . . 6 ⊢ (𝐾 ∈ Top → ∪ (sigaGen‘𝐾) = ∪ 𝐾)
16	1, 14, 15	3syl 18	. . . . 5 ⊢ (𝜑 → ∪ (sigaGen‘𝐾) = ∪ 𝐾)
17	13, 16	eqtrd 2780	. . . 4 ⊢ (𝜑 → ∪ 𝑇 = ∪ 𝐾)
18	11, 17	feq23d 6593	. . 3 ⊢ (𝜑 → (𝐹:∪ 𝑆⟶∪ 𝑇 ↔ 𝐹:∪ 𝐽⟶∪ 𝐾))
19	5, 18	mpbird 256	. 2 ⊢ (𝜑 → 𝐹:∪ 𝑆⟶∪ 𝑇)
20		sssigagen 32109	. . . . . . 7 ⊢ (𝐽 ∈ Top → 𝐽 ⊆ (sigaGen‘𝐽))
21	1, 8, 20	3syl 18	. . . . . 6 ⊢ (𝜑 → 𝐽 ⊆ (sigaGen‘𝐽))
22	21, 6	sseqtrrd 3967	. . . . 5 ⊢ (𝜑 → 𝐽 ⊆ 𝑆)
23	22	adantr 481	. . . 4 ⊢ ((𝜑 ∧ 𝑎 ∈ 𝐾) → 𝐽 ⊆ 𝑆)
24		cnima 22414	. . . . 5 ⊢ ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ 𝑎 ∈ 𝐾) → (◡𝐹 “ 𝑎) ∈ 𝐽)
25	1, 24	sylan 580	. . . 4 ⊢ ((𝜑 ∧ 𝑎 ∈ 𝐾) → (◡𝐹 “ 𝑎) ∈ 𝐽)
26	23, 25	sseldd 3927	. . 3 ⊢ ((𝜑 ∧ 𝑎 ∈ 𝐾) → (◡𝐹 “ 𝑎) ∈ 𝑆)
27	26	ralrimiva 3110	. 2 ⊢ (𝜑 → ∀𝑎 ∈ 𝐾 (◡𝐹 “ 𝑎) ∈ 𝑆)
28		elex 3449	. . . 4 ⊢ (𝐾 ∈ Top → 𝐾 ∈ V)
29	1, 14, 28	3syl 18	. . 3 ⊢ (𝜑 → 𝐾 ∈ V)
30		sigagensiga 32105	. . . . . 6 ⊢ (𝐽 ∈ Top → (sigaGen‘𝐽) ∈ (sigAlgebra‘∪ 𝐽))
31	1, 8, 30	3syl 18	. . . . 5 ⊢ (𝜑 → (sigaGen‘𝐽) ∈ (sigAlgebra‘∪ 𝐽))
32	6, 31	eqeltrd 2841	. . . 4 ⊢ (𝜑 → 𝑆 ∈ (sigAlgebra‘∪ 𝐽))
33		elrnsiga 32090	. . . 4 ⊢ (𝑆 ∈ (sigAlgebra‘∪ 𝐽) → 𝑆 ∈ ∪ ran sigAlgebra)
34	32, 33	syl 17	. . 3 ⊢ (𝜑 → 𝑆 ∈ ∪ ran sigAlgebra)
35	29, 34, 12	imambfm 32225	. 2 ⊢ (𝜑 → (𝐹 ∈ (𝑆MblFnM𝑇) ↔ (𝐹:∪ 𝑆⟶∪ 𝑇 ∧ ∀𝑎 ∈ 𝐾 (◡𝐹 “ 𝑎) ∈ 𝑆)))
36	19, 27, 35	mpbir2and 710	1 ⊢ (𝜑 → 𝐹 ∈ (𝑆MblFnM𝑇))

Syntax hints:   → wi 4   ∧ wa 396   = wceq 1542   ∈ wcel 2110  ∀wral 3066  Vcvv 3431   ⊆ wss 3892  ∪ cuni 4845  ^◡ccnv 5589  ran crn 5591   “ cima 5593  ⟶wf 6428  ‘cfv 6432  (class class class)co 7271  Topctop 22040   Cn ccn 22373  sigAlgebracsiga 32072  sigaGencsigagen 32102  MblFnMcmbfm 32213

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2015  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2158  ax-12 2175  ax-ext 2711  ax-rep 5214  ax-sep 5227  ax-nul 5234  ax-pow 5292  ax-pr 5356  ax-un 7582  ax-inf2 9377  ax-ac2 10220

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1545  df-fal 1555  df-ex 1787  df-nf 1791  df-sb 2072  df-mo 2542  df-eu 2571  df-clab 2718  df-cleq 2732  df-clel 2818  df-nfc 2891  df-ne 2946  df-ral 3071  df-rex 3072  df-reu 3073  df-rmo 3074  df-rab 3075  df-v 3433  df-sbc 3721  df-csb 3838  df-dif 3895  df-un 3897  df-in 3899  df-ss 3909  df-pss 3911  df-nul 4263  df-if 4466  df-pw 4541  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4846  df-int 4886  df-iun 4932  df-iin 4933  df-br 5080  df-opab 5142  df-mpt 5163  df-tr 5197  df-id 5490  df-eprel 5496  df-po 5504  df-so 5505  df-fr 5545  df-se 5546  df-we 5547  df-xp 5596  df-rel 5597  df-cnv 5598  df-co 5599  df-dm 5600  df-rn 5601  df-res 5602  df-ima 5603  df-pred 6201  df-ord 6268  df-on 6269  df-lim 6270  df-suc 6271  df-iota 6390  df-fun 6434  df-fn 6435  df-f 6436  df-f1 6437  df-fo 6438  df-f1o 6439  df-fv 6440  df-isom 6441  df-riota 7228  df-ov 7274  df-oprab 7275  df-mpo 7276  df-om 7707  df-1st 7824  df-2nd 7825  df-frecs 8088  df-wrecs 8119  df-recs 8193  df-rdg 8232  df-1o 8288  df-2o 8289  df-er 8481  df-map 8600  df-en 8717  df-dom 8718  df-sdom 8719  df-fin 8720  df-oi 9247  df-dju 9660  df-card 9698  df-acn 9701  df-ac 9873  df-top 22041  df-topon 22058  df-cn 22376  df-siga 32073  df-sigagen 32103  df-mbfm 32214

This theorem is referenced by:  sxbrsiga  32253  rrvadd  32415  rrvmulc  32416