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Theorem areass 26014
Description: A measurable region is a subset of ℝ × ℝ. (Contributed by Mario Carneiro, 21-Jun-2015.)
Assertion
Ref Expression
areass (𝑆 ∈ dom area → 𝑆 ⊆ (ℝ × ℝ))

Proof of Theorem areass
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 dmarea 26012 . 2 (𝑆 ∈ dom area ↔ (𝑆 ⊆ (ℝ × ℝ) ∧ ∀𝑥 ∈ ℝ (𝑆 “ {𝑥}) ∈ (vol “ ℝ) ∧ (𝑥 ∈ ℝ ↦ (vol‘(𝑆 “ {𝑥}))) ∈ 𝐿1))
21simp1bi 1143 1 (𝑆 ∈ dom area → 𝑆 ⊆ (ℝ × ℝ))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wcel 2108  wral 3063  wss 3883  {csn 4558  cmpt 5153   × cxp 5578  ccnv 5579  dom cdm 5580  cima 5583  cfv 6418  cr 10801  volcvol 24532  𝐿1cibl 24686  areacarea 26010
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-sep 5218  ax-nul 5225  ax-pow 5283  ax-pr 5347  ax-un 7566  ax-cnex 10858  ax-resscn 10859
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ral 3068  df-rex 3069  df-rab 3072  df-v 3424  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-op 4565  df-uni 4837  df-br 5071  df-opab 5133  df-mpt 5154  df-id 5480  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-iota 6376  df-fun 6420  df-fn 6421  df-fv 6426  df-sum 15326  df-itg 24692  df-area 26011
This theorem is referenced by: (None)
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