Theorem brfae 34212

Description: 'almost everywhere' relation for two functions 𝐹 and 𝐺 with regard to the measure 𝑀. (Contributed by Thierry Arnoux, 22-Oct-2017.)

Hypotheses

Ref	Expression
brfae.0	⊢ dom 𝑅 = 𝐷
brfae.1	⊢ (𝜑 → 𝑅 ∈ V)
brfae.2	⊢ (𝜑 → 𝑀 ∈ ∪ ran measures)
brfae.3	⊢ (𝜑 → 𝐹 ∈ (𝐷 ↑m ∪ dom 𝑀))
brfae.4	⊢ (𝜑 → 𝐺 ∈ (𝐷 ↑m ∪ dom 𝑀))

Assertion

Ref	Expression
brfae	⊢ (𝜑 → (𝐹(𝑅~ a.e.𝑀)𝐺 ↔ {𝑥 ∈ ∪ dom 𝑀 ∣ (𝐹‘𝑥)𝑅(𝐺‘𝑥)}a.e.𝑀))

Distinct variable groups:   𝑥,𝐹   𝑥,𝐺   𝑥,𝑀   𝑥,𝑅

Allowed substitution hints:   𝜑(𝑥)   𝐷(𝑥)

Proof of Theorem brfae

Dummy variables 𝑓 𝑔 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		brfae.3	. . 3 ⊢ (𝜑 → 𝐹 ∈ (𝐷 ↑m ∪ dom 𝑀))
2		brfae.4	. . 3 ⊢ (𝜑 → 𝐺 ∈ (𝐷 ↑m ∪ dom 𝑀))
3		simpl 482	. . . . . . 7 ⊢ ((𝑓 = 𝐹 ∧ 𝑔 = 𝐺) → 𝑓 = 𝐹)
4	3	eleq1d 2829	. . . . . 6 ⊢ ((𝑓 = 𝐹 ∧ 𝑔 = 𝐺) → (𝑓 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ↔ 𝐹 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)))
5		simpr 484	. . . . . . 7 ⊢ ((𝑓 = 𝐹 ∧ 𝑔 = 𝐺) → 𝑔 = 𝐺)
6	5	eleq1d 2829	. . . . . 6 ⊢ ((𝑓 = 𝐹 ∧ 𝑔 = 𝐺) → (𝑔 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ↔ 𝐺 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)))
7	4, 6	anbi12d 631	. . . . 5 ⊢ ((𝑓 = 𝐹 ∧ 𝑔 = 𝐺) → ((𝑓 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ∧ 𝑔 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)) ↔ (𝐹 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ∧ 𝐺 ∈ (dom 𝑅 ↑m ∪ dom 𝑀))))
8	3	fveq1d 6922	. . . . . . . 8 ⊢ ((𝑓 = 𝐹 ∧ 𝑔 = 𝐺) → (𝑓‘𝑥) = (𝐹‘𝑥))
9	5	fveq1d 6922	. . . . . . . 8 ⊢ ((𝑓 = 𝐹 ∧ 𝑔 = 𝐺) → (𝑔‘𝑥) = (𝐺‘𝑥))
10	8, 9	breq12d 5179	. . . . . . 7 ⊢ ((𝑓 = 𝐹 ∧ 𝑔 = 𝐺) → ((𝑓‘𝑥)𝑅(𝑔‘𝑥) ↔ (𝐹‘𝑥)𝑅(𝐺‘𝑥)))
11	10	rabbidv 3451	. . . . . 6 ⊢ ((𝑓 = 𝐹 ∧ 𝑔 = 𝐺) → {𝑥 ∈ ∪ dom 𝑀 ∣ (𝑓‘𝑥)𝑅(𝑔‘𝑥)} = {𝑥 ∈ ∪ dom 𝑀 ∣ (𝐹‘𝑥)𝑅(𝐺‘𝑥)})
12	11	breq1d 5176	. . . . 5 ⊢ ((𝑓 = 𝐹 ∧ 𝑔 = 𝐺) → ({𝑥 ∈ ∪ dom 𝑀 ∣ (𝑓‘𝑥)𝑅(𝑔‘𝑥)}a.e.𝑀 ↔ {𝑥 ∈ ∪ dom 𝑀 ∣ (𝐹‘𝑥)𝑅(𝐺‘𝑥)}a.e.𝑀))
13	7, 12	anbi12d 631	. . . 4 ⊢ ((𝑓 = 𝐹 ∧ 𝑔 = 𝐺) → (((𝑓 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ∧ 𝑔 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)) ∧ {𝑥 ∈ ∪ dom 𝑀 ∣ (𝑓‘𝑥)𝑅(𝑔‘𝑥)}a.e.𝑀) ↔ ((𝐹 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ∧ 𝐺 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)) ∧ {𝑥 ∈ ∪ dom 𝑀 ∣ (𝐹‘𝑥)𝑅(𝐺‘𝑥)}a.e.𝑀)))
14		eqid 2740	. . . 4 ⊢ {⟨𝑓, 𝑔⟩ ∣ ((𝑓 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ∧ 𝑔 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)) ∧ {𝑥 ∈ ∪ dom 𝑀 ∣ (𝑓‘𝑥)𝑅(𝑔‘𝑥)}a.e.𝑀)} = {⟨𝑓, 𝑔⟩ ∣ ((𝑓 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ∧ 𝑔 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)) ∧ {𝑥 ∈ ∪ dom 𝑀 ∣ (𝑓‘𝑥)𝑅(𝑔‘𝑥)}a.e.𝑀)}
15	13, 14	brabga 5553	. . 3 ⊢ ((𝐹 ∈ (𝐷 ↑m ∪ dom 𝑀) ∧ 𝐺 ∈ (𝐷 ↑m ∪ dom 𝑀)) → (𝐹{⟨𝑓, 𝑔⟩ ∣ ((𝑓 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ∧ 𝑔 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)) ∧ {𝑥 ∈ ∪ dom 𝑀 ∣ (𝑓‘𝑥)𝑅(𝑔‘𝑥)}a.e.𝑀)}𝐺 ↔ ((𝐹 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ∧ 𝐺 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)) ∧ {𝑥 ∈ ∪ dom 𝑀 ∣ (𝐹‘𝑥)𝑅(𝐺‘𝑥)}a.e.𝑀)))
16	1, 2, 15	syl2anc 583	. 2 ⊢ (𝜑 → (𝐹{⟨𝑓, 𝑔⟩ ∣ ((𝑓 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ∧ 𝑔 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)) ∧ {𝑥 ∈ ∪ dom 𝑀 ∣ (𝑓‘𝑥)𝑅(𝑔‘𝑥)}a.e.𝑀)}𝐺 ↔ ((𝐹 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ∧ 𝐺 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)) ∧ {𝑥 ∈ ∪ dom 𝑀 ∣ (𝐹‘𝑥)𝑅(𝐺‘𝑥)}a.e.𝑀)))
17		brfae.1	. . . 4 ⊢ (𝜑 → 𝑅 ∈ V)
18		brfae.2	. . . 4 ⊢ (𝜑 → 𝑀 ∈ ∪ ran measures)
19		faeval 34210	. . . 4 ⊢ ((𝑅 ∈ V ∧ 𝑀 ∈ ∪ ran measures) → (𝑅~ a.e.𝑀) = {⟨𝑓, 𝑔⟩ ∣ ((𝑓 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ∧ 𝑔 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)) ∧ {𝑥 ∈ ∪ dom 𝑀 ∣ (𝑓‘𝑥)𝑅(𝑔‘𝑥)}a.e.𝑀)})
20	17, 18, 19	syl2anc 583	. . 3 ⊢ (𝜑 → (𝑅~ a.e.𝑀) = {⟨𝑓, 𝑔⟩ ∣ ((𝑓 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ∧ 𝑔 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)) ∧ {𝑥 ∈ ∪ dom 𝑀 ∣ (𝑓‘𝑥)𝑅(𝑔‘𝑥)}a.e.𝑀)})
21	20	breqd 5177	. 2 ⊢ (𝜑 → (𝐹(𝑅~ a.e.𝑀)𝐺 ↔ 𝐹{⟨𝑓, 𝑔⟩ ∣ ((𝑓 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ∧ 𝑔 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)) ∧ {𝑥 ∈ ∪ dom 𝑀 ∣ (𝑓‘𝑥)𝑅(𝑔‘𝑥)}a.e.𝑀)}𝐺))
22		brfae.0	. . . . . 6 ⊢ dom 𝑅 = 𝐷
23	22	oveq1i 7458	. . . . 5 ⊢ (dom 𝑅 ↑m ∪ dom 𝑀) = (𝐷 ↑m ∪ dom 𝑀)
24	1, 23	eleqtrrdi 2855	. . . 4 ⊢ (𝜑 → 𝐹 ∈ (dom 𝑅 ↑m ∪ dom 𝑀))
25	2, 23	eleqtrrdi 2855	. . . 4 ⊢ (𝜑 → 𝐺 ∈ (dom 𝑅 ↑m ∪ dom 𝑀))
26	24, 25	jca 511	. . 3 ⊢ (𝜑 → (𝐹 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ∧ 𝐺 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)))
27	26	biantrurd 532	. 2 ⊢ (𝜑 → ({𝑥 ∈ ∪ dom 𝑀 ∣ (𝐹‘𝑥)𝑅(𝐺‘𝑥)}a.e.𝑀 ↔ ((𝐹 ∈ (dom 𝑅 ↑m ∪ dom 𝑀) ∧ 𝐺 ∈ (dom 𝑅 ↑m ∪ dom 𝑀)) ∧ {𝑥 ∈ ∪ dom 𝑀 ∣ (𝐹‘𝑥)𝑅(𝐺‘𝑥)}a.e.𝑀)))
28	16, 21, 27	3bitr4d 311	1 ⊢ (𝜑 → (𝐹(𝑅~ a.e.𝑀)𝐺 ↔ {𝑥 ∈ ∪ dom 𝑀 ∣ (𝐹‘𝑥)𝑅(𝐺‘𝑥)}a.e.𝑀))

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   = wceq 1537   ∈ wcel 2108  {crab 3443  Vcvv 3488  ∪ cuni 4931   class class class wbr 5166  {copab 5228  dom cdm 5700  ran crn 5701  ‘cfv 6573  (class class class)co 7448   ↑_m cmap 8884  measurescmeas 34159  a.e.cae 34201  ~ a.e.cfae 34202

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2158  ax-12 2178  ax-ext 2711  ax-sep 5317  ax-nul 5324  ax-pow 5383  ax-pr 5447  ax-un 7770

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-nf 1782  df-sb 2065  df-mo 2543  df-eu 2572  df-clab 2718  df-cleq 2732  df-clel 2819  df-nfc 2895  df-ne 2947  df-ral 3068  df-rex 3077  df-rab 3444  df-v 3490  df-sbc 3805  df-dif 3979  df-un 3981  df-in 3983  df-ss 3993  df-nul 4353  df-if 4549  df-pw 4624  df-sn 4649  df-pr 4651  df-op 4655  df-uni 4932  df-br 5167  df-opab 5229  df-id 5593  df-xp 5706  df-rel 5707  df-cnv 5708  df-co 5709  df-dm 5710  df-iota 6525  df-fun 6575  df-fv 6581  df-ov 7451  df-oprab 7452  df-mpo 7453  df-fae 34209

This theorem is referenced by: (None)