Theorem cnmbfm 30866

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 2825	. . . . 5 ⊢ ∪ 𝐽 = ∪ 𝐽
3		eqid 2825	. . . . 5 ⊢ ∪ 𝐾 = ∪ 𝐾
4	2, 3	cnf 21428	. . . 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 4670	. . . . 5 ⊢ (𝜑 → ∪ 𝑆 = ∪ (sigaGen‘𝐽))
8		cntop1 21422	. . . . . 6 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐽 ∈ Top)
9		unisg 30747	. . . . . 6 ⊢ (𝐽 ∈ Top → ∪ (sigaGen‘𝐽) = ∪ 𝐽)
10	1, 8, 9	3syl 18	. . . . 5 ⊢ (𝜑 → ∪ (sigaGen‘𝐽) = ∪ 𝐽)
11	7, 10	eqtrd 2861	. . . 4 ⊢ (𝜑 → ∪ 𝑆 = ∪ 𝐽)
12		cnmbfm.3	. . . . . 6 ⊢ (𝜑 → 𝑇 = (sigaGen‘𝐾))
13	12	unieqd 4670	. . . . 5 ⊢ (𝜑 → ∪ 𝑇 = ∪ (sigaGen‘𝐾))
14		cntop2 21423	. . . . . 6 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐾 ∈ Top)
15		unisg 30747	. . . . . 6 ⊢ (𝐾 ∈ Top → ∪ (sigaGen‘𝐾) = ∪ 𝐾)
16	1, 14, 15	3syl 18	. . . . 5 ⊢ (𝜑 → ∪ (sigaGen‘𝐾) = ∪ 𝐾)
17	13, 16	eqtrd 2861	. . . 4 ⊢ (𝜑 → ∪ 𝑇 = ∪ 𝐾)
18	11, 17	feq23d 6277	. . 3 ⊢ (𝜑 → (𝐹:∪ 𝑆⟶∪ 𝑇 ↔ 𝐹:∪ 𝐽⟶∪ 𝐾))
19	5, 18	mpbird 249	. 2 ⊢ (𝜑 → 𝐹:∪ 𝑆⟶∪ 𝑇)
20		sssigagen 30749	. . . . . . 7 ⊢ (𝐽 ∈ Top → 𝐽 ⊆ (sigaGen‘𝐽))
21	1, 8, 20	3syl 18	. . . . . 6 ⊢ (𝜑 → 𝐽 ⊆ (sigaGen‘𝐽))
22	21, 6	sseqtr4d 3867	. . . . 5 ⊢ (𝜑 → 𝐽 ⊆ 𝑆)
23	22	adantr 474	. . . 4 ⊢ ((𝜑 ∧ 𝑎 ∈ 𝐾) → 𝐽 ⊆ 𝑆)
24		cnima 21447	. . . . 5 ⊢ ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ 𝑎 ∈ 𝐾) → (◡𝐹 “ 𝑎) ∈ 𝐽)
25	1, 24	sylan 575	. . . 4 ⊢ ((𝜑 ∧ 𝑎 ∈ 𝐾) → (◡𝐹 “ 𝑎) ∈ 𝐽)
26	23, 25	sseldd 3828	. . 3 ⊢ ((𝜑 ∧ 𝑎 ∈ 𝐾) → (◡𝐹 “ 𝑎) ∈ 𝑆)
27	26	ralrimiva 3175	. 2 ⊢ (𝜑 → ∀𝑎 ∈ 𝐾 (◡𝐹 “ 𝑎) ∈ 𝑆)
28		elex 3429	. . . 4 ⊢ (𝐾 ∈ Top → 𝐾 ∈ V)
29	1, 14, 28	3syl 18	. . 3 ⊢ (𝜑 → 𝐾 ∈ V)
30		sigagensiga 30745	. . . . . 6 ⊢ (𝐽 ∈ Top → (sigaGen‘𝐽) ∈ (sigAlgebra‘∪ 𝐽))
31	1, 8, 30	3syl 18	. . . . 5 ⊢ (𝜑 → (sigaGen‘𝐽) ∈ (sigAlgebra‘∪ 𝐽))
32	6, 31	eqeltrd 2906	. . . 4 ⊢ (𝜑 → 𝑆 ∈ (sigAlgebra‘∪ 𝐽))
33		elrnsiga 30730	. . . 4 ⊢ (𝑆 ∈ (sigAlgebra‘∪ 𝐽) → 𝑆 ∈ ∪ ran sigAlgebra)
34	32, 33	syl 17	. . 3 ⊢ (𝜑 → 𝑆 ∈ ∪ ran sigAlgebra)
35	29, 34, 12	imambfm 30865	. 2 ⊢ (𝜑 → (𝐹 ∈ (𝑆MblFnM𝑇) ↔ (𝐹:∪ 𝑆⟶∪ 𝑇 ∧ ∀𝑎 ∈ 𝐾 (◡𝐹 “ 𝑎) ∈ 𝑆)))
36	19, 27, 35	mpbir2and 704	1 ⊢ (𝜑 → 𝐹 ∈ (𝑆MblFnM𝑇))

Syntax hints:   → wi 4   ∧ wa 386   = wceq 1656   ∈ wcel 2164  ∀wral 3117  Vcvv 3414   ⊆ wss 3798  ∪ cuni 4660  ^◡ccnv 5345  ran crn 5347   “ cima 5349  ⟶wf 6123  ‘cfv 6127  (class class class)co 6910  Topctop 21075   Cn ccn 21406  sigAlgebracsiga 30711  sigaGencsigagen 30742  MblFnMcmbfm 30853

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1894  ax-4 1908  ax-5 2009  ax-6 2075  ax-7 2112  ax-8 2166  ax-9 2173  ax-10 2192  ax-11 2207  ax-12 2220  ax-13 2389  ax-ext 2803  ax-rep 4996  ax-sep 5007  ax-nul 5015  ax-pow 5067  ax-pr 5129  ax-un 7214  ax-inf2 8822  ax-ac2 9607

This theorem depends on definitions:  df-bi 199  df-an 387  df-or 879  df-3or 1112  df-3an 1113  df-tru 1660  df-fal 1670  df-ex 1879  df-nf 1883  df-sb 2068  df-mo 2605  df-eu 2640  df-clab 2812  df-cleq 2818  df-clel 2821  df-nfc 2958  df-ne 3000  df-ral 3122  df-rex 3123  df-reu 3124  df-rmo 3125  df-rab 3126  df-v 3416  df-sbc 3663  df-csb 3758  df-dif 3801  df-un 3803  df-in 3805  df-ss 3812  df-pss 3814  df-nul 4147  df-if 4309  df-pw 4382  df-sn 4400  df-pr 4402  df-tp 4404  df-op 4406  df-uni 4661  df-int 4700  df-iun 4744  df-iin 4745  df-br 4876  df-opab 4938  df-mpt 4955  df-tr 4978  df-id 5252  df-eprel 5257  df-po 5265  df-so 5266  df-fr 5305  df-se 5306  df-we 5307  df-xp 5352  df-rel 5353  df-cnv 5354  df-co 5355  df-dm 5356  df-rn 5357  df-res 5358  df-ima 5359  df-pred 5924  df-ord 5970  df-on 5971  df-lim 5972  df-suc 5973  df-iota 6090  df-fun 6129  df-fn 6130  df-f 6131  df-f1 6132  df-fo 6133  df-f1o 6134  df-fv 6135  df-isom 6136  df-riota 6871  df-ov 6913  df-oprab 6914  df-mpt2 6915  df-om 7332  df-1st 7433  df-2nd 7434  df-wrecs 7677  df-recs 7739  df-rdg 7777  df-1o 7831  df-2o 7832  df-oadd 7835  df-er 8014  df-map 8129  df-en 8229  df-dom 8230  df-sdom 8231  df-fin 8232  df-oi 8691  df-card 9085  df-acn 9088  df-ac 9259  df-cda 9312  df-top 21076  df-topon 21093  df-cn 21409  df-siga 30712  df-sigagen 30743  df-mbfm 30854

This theorem is referenced by:  sxbrsiga  30893  rrvadd  31056  rrvmulc  31057