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Theorem fvvolioof 47093
Description: The function value of the Lebesgue measure of an open interval composed with a function. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
Hypotheses
Ref Expression
fvvolioof.f (𝜑 → 𝐹:𝐴⟶(ℝ* × ℝ*))
fvvolioof.x (𝜑 → 𝑋 ∈ 𝐴)
Assertion
Ref Expression
fvvolioof (𝜑 → (((vol ∘ (,)) ∘ 𝐹)‘𝑋) = (vol‘((1st ‘(𝐹‘𝑋))(,)(2nd ‘(𝐹‘𝑋)))))

Proof of Theorem fvvolioof
StepHypRef Expression
1 fvvolioof.f . . . 4 (𝜑 → 𝐹:𝐴⟶(ℝ* × ℝ*))
21ffund 6715 . . 3 (𝜑 → Fun 𝐹)
3 fvvolioof.x . . . 4 (𝜑 → 𝑋 ∈ 𝐴)
41fdmd 6721 . . . . 5 (𝜑 → dom 𝐹 = 𝐴)
54eqcomd 2766 . . . 4 (𝜑 → 𝐴 = dom 𝐹)
63, 5eleqtrd 2862 . . 3 (𝜑 → 𝑋 ∈ dom 𝐹)
7 fvco 6984 . . 3 ((Fun 𝐹 ∧ 𝑋 ∈ dom 𝐹) → (((vol ∘ (,)) ∘ 𝐹)‘𝑋) = ((vol ∘ (,))‘(𝐹‘𝑋)))
82, 6, 7syl2anc 596 . 2 (𝜑 → (((vol ∘ (,)) ∘ 𝐹)‘𝑋) = ((vol ∘ (,))‘(𝐹‘𝑋)))
9 ioof 13582 . . . . 5 (,):(ℝ* × ℝ*)⟶𝒫 ℝ
10 ffun 6713 . . . . 5 ((,):(ℝ* × ℝ*)⟶𝒫 ℝ → Fun (,))
119, 10ax-mp 5 . . . 4 Fun (,)
1211a1i 11 . . 3 (𝜑 → Fun (,))
131, 3ffvelcdmd 7086 . . . 4 (𝜑 → (𝐹‘𝑋) ∈ (ℝ* × ℝ*))
149fdmi 6722 . . . 4 dom (,) = (ℝ* × ℝ*)
1513, 14eleqtrrdi 2871 . . 3 (𝜑 → (𝐹‘𝑋) ∈ dom (,))
16 fvco 6984 . . 3 ((Fun (,) ∧ (𝐹‘𝑋) ∈ dom (,)) → ((vol ∘ (,))‘(𝐹‘𝑋)) = (vol‘((,)‘(𝐹‘𝑋))))
1712, 15, 16syl2anc 596 . 2 (𝜑 → ((vol ∘ (,))‘(𝐹‘𝑋)) = (vol‘((,)‘(𝐹‘𝑋))))
18 df-ov 7424 . . . . 5 ((1st ‘(𝐹‘𝑋))(,)(2nd ‘(𝐹‘𝑋))) = ((,)‘⟨(1st ‘(𝐹‘𝑋)), (2nd ‘(𝐹‘𝑋))⟩)
1918a1i 11 . . . 4 (𝜑 → ((1st ‘(𝐹‘𝑋))(,)(2nd ‘(𝐹‘𝑋))) = ((,)‘⟨(1st ‘(𝐹‘𝑋)), (2nd ‘(𝐹‘𝑋))⟩))
20 1st2nd2 8041 . . . . . . 7 ((𝐹‘𝑋) ∈ (ℝ* × ℝ*) → (𝐹‘𝑋) = ⟨(1st ‘(𝐹‘𝑋)), (2nd ‘(𝐹‘𝑋))⟩)
2113, 20syl 18 . . . . . 6 (𝜑 → (𝐹‘𝑋) = ⟨(1st ‘(𝐹‘𝑋)), (2nd ‘(𝐹‘𝑋))⟩)
2221eqcomd 2766 . . . . 5 (𝜑 → ⟨(1st ‘(𝐹‘𝑋)), (2nd ‘(𝐹‘𝑋))⟩ = (𝐹‘𝑋))
2322fveq2d 6890 . . . 4 (𝜑 → ((,)‘⟨(1st ‘(𝐹‘𝑋)), (2nd ‘(𝐹‘𝑋))⟩) = ((,)‘(𝐹‘𝑋)))
2419, 23eqtr2d 2796 . . 3 (𝜑 → ((,)‘(𝐹‘𝑋)) = ((1st ‘(𝐹‘𝑋))(,)(2nd ‘(𝐹‘𝑋))))
2524fveq2d 6890 . 2 (𝜑 → (vol‘((,)‘(𝐹‘𝑋))) = (vol‘((1st ‘(𝐹‘𝑋))(,)(2nd ‘(𝐹‘𝑋)))))
268, 17, 253eqtrd 2799 1 (𝜑 → (((vol ∘ (,)) ∘ 𝐹)‘𝑋) = (vol‘((1st ‘(𝐹‘𝑋))(,)(2nd ‘(𝐹‘𝑋)))))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1569   ∈ wcel 2144  𝒫 cpw 4556  ⟨cop 4834   × cxp 5648  dom cdm 5650   ∘ ccom 5654  Fun wfun 6533  ⟶wf 6535  ‘cfv 6539  (class class class)co 7421  1st c1st 8000  2nd c2nd 8001  ℝcr 11203  ℝ*cxr 11346  (,)cioo 13480  volcvol 25790
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-sep 5248  ax-nul 5259  ax-pow 5326  ax-pr 5390  ax-un 7752  ax-cnex 11260  ax-resscn 11261  ax-pre-lttri 11278  ax-pre-lttrn 11279
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-nel 3062  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-sbc 3739  df-csb 3847  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4585  df-pr 4587  df-op 4835  df-uni 4867  df-iun 4952  df-br 5103  df-opab 5167  df-mpt 5186  df-id 5545  df-po 5558  df-so 5559  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-ima 5663  df-iota 6494  df-fun 6541  df-fn 6542  df-f 6543  df-f1 6544  df-fo 6545  df-f1o 6546  df-fv 6547  df-ov 7424  df-oprab 7425  df-mpo 7426  df-1st 8002  df-2nd 8003  df-er 8721  df-en 8978  df-dom 8979  df-sdom 8980  df-pnf 11349  df-mnf 11350  df-xr 11351  df-ltxr 11352  df-le 11353  df-ioo 13484
This theorem is used by:  volioofmpt  47098  voliooicof  47100
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