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Theorem braew 30773
Description: 'almost everywhere' relation for a measure 𝑀 and a property 𝜑 (Contributed by Thierry Arnoux, 20-Oct-2017.)
Hypothesis
Ref Expression
braew.1 dom 𝑀 = 𝑂
Assertion
Ref Expression
braew (𝑀 ran measures → ({𝑥𝑂𝜑}a.e.𝑀 ↔ (𝑀‘{𝑥𝑂 ∣ ¬ 𝜑}) = 0))
Distinct variable group:   𝑥,𝑂
Allowed substitution hints:   𝜑(𝑥)   𝑀(𝑥)

Proof of Theorem braew
Dummy variables 𝑚 𝑎 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 braew.1 . . . . 5 dom 𝑀 = 𝑂
2 dmexg 7299 . . . . . 6 (𝑀 ran measures → dom 𝑀 ∈ V)
3 uniexg 7157 . . . . . 6 (dom 𝑀 ∈ V → dom 𝑀 ∈ V)
42, 3syl 17 . . . . 5 (𝑀 ran measures → dom 𝑀 ∈ V)
51, 4syl5eqelr 2849 . . . 4 (𝑀 ran measures → 𝑂 ∈ V)
6 rabexg 4974 . . . 4 (𝑂 ∈ V → {𝑥𝑂𝜑} ∈ V)
75, 6syl 17 . . 3 (𝑀 ran measures → {𝑥𝑂𝜑} ∈ V)
8 simpr 477 . . . . . 6 ((𝑎 = {𝑥𝑂𝜑} ∧ 𝑚 = 𝑀) → 𝑚 = 𝑀)
98dmeqd 5496 . . . . . . . 8 ((𝑎 = {𝑥𝑂𝜑} ∧ 𝑚 = 𝑀) → dom 𝑚 = dom 𝑀)
109unieqd 4606 . . . . . . 7 ((𝑎 = {𝑥𝑂𝜑} ∧ 𝑚 = 𝑀) → dom 𝑚 = dom 𝑀)
11 simpl 474 . . . . . . 7 ((𝑎 = {𝑥𝑂𝜑} ∧ 𝑚 = 𝑀) → 𝑎 = {𝑥𝑂𝜑})
1210, 11difeq12d 3893 . . . . . 6 ((𝑎 = {𝑥𝑂𝜑} ∧ 𝑚 = 𝑀) → ( dom 𝑚𝑎) = ( dom 𝑀 ∖ {𝑥𝑂𝜑}))
138, 12fveq12d 6386 . . . . 5 ((𝑎 = {𝑥𝑂𝜑} ∧ 𝑚 = 𝑀) → (𝑚‘( dom 𝑚𝑎)) = (𝑀‘( dom 𝑀 ∖ {𝑥𝑂𝜑})))
1413eqeq1d 2767 . . . 4 ((𝑎 = {𝑥𝑂𝜑} ∧ 𝑚 = 𝑀) → ((𝑚‘( dom 𝑚𝑎)) = 0 ↔ (𝑀‘( dom 𝑀 ∖ {𝑥𝑂𝜑})) = 0))
15 df-ae 30770 . . . 4 a.e. = {⟨𝑎, 𝑚⟩ ∣ (𝑚‘( dom 𝑚𝑎)) = 0}
1614, 15brabga 5152 . . 3 (({𝑥𝑂𝜑} ∈ V ∧ 𝑀 ran measures) → ({𝑥𝑂𝜑}a.e.𝑀 ↔ (𝑀‘( dom 𝑀 ∖ {𝑥𝑂𝜑})) = 0))
177, 16mpancom 679 . 2 (𝑀 ran measures → ({𝑥𝑂𝜑}a.e.𝑀 ↔ (𝑀‘( dom 𝑀 ∖ {𝑥𝑂𝜑})) = 0))
181difeq1i 3888 . . . . 5 ( dom 𝑀 ∖ {𝑥𝑂𝜑}) = (𝑂 ∖ {𝑥𝑂𝜑})
19 notrab 4070 . . . . 5 (𝑂 ∖ {𝑥𝑂𝜑}) = {𝑥𝑂 ∣ ¬ 𝜑}
2018, 19eqtri 2787 . . . 4 ( dom 𝑀 ∖ {𝑥𝑂𝜑}) = {𝑥𝑂 ∣ ¬ 𝜑}
2120fveq2i 6382 . . 3 (𝑀‘( dom 𝑀 ∖ {𝑥𝑂𝜑})) = (𝑀‘{𝑥𝑂 ∣ ¬ 𝜑})
2221eqeq1i 2770 . 2 ((𝑀‘( dom 𝑀 ∖ {𝑥𝑂𝜑})) = 0 ↔ (𝑀‘{𝑥𝑂 ∣ ¬ 𝜑}) = 0)
2317, 22syl6bb 278 1 (𝑀 ran measures → ({𝑥𝑂𝜑}a.e.𝑀 ↔ (𝑀‘{𝑥𝑂 ∣ ¬ 𝜑}) = 0))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 197  wa 384   = wceq 1652  wcel 2155  {crab 3059  Vcvv 3350  cdif 3731   cuni 4596   class class class wbr 4811  dom cdm 5279  ran crn 5280  cfv 6070  0cc0 10193  measurescmeas 30726  a.e.cae 30768
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1890  ax-4 1904  ax-5 2005  ax-6 2070  ax-7 2105  ax-8 2157  ax-9 2164  ax-10 2183  ax-11 2198  ax-12 2211  ax-13 2352  ax-ext 2743  ax-sep 4943  ax-nul 4951  ax-pr 5064  ax-un 7151
This theorem depends on definitions:  df-bi 198  df-an 385  df-or 874  df-3an 1109  df-tru 1656  df-ex 1875  df-nf 1879  df-sb 2063  df-mo 2565  df-eu 2582  df-clab 2752  df-cleq 2758  df-clel 2761  df-nfc 2896  df-ral 3060  df-rex 3061  df-rab 3064  df-v 3352  df-dif 3737  df-un 3739  df-in 3741  df-ss 3748  df-nul 4082  df-if 4246  df-sn 4337  df-pr 4339  df-op 4343  df-uni 4597  df-br 4812  df-opab 4874  df-cnv 5287  df-dm 5289  df-rn 5290  df-iota 6033  df-fv 6078  df-ae 30770
This theorem is referenced by:  truae  30774  aean  30775
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