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Theorem ovolfsval 23046
 Description: The value of the interval length function. (Contributed by Mario Carneiro, 16-Mar-2014.)
Hypothesis
Ref Expression
ovolfs.1 𝐺 = ((abs ∘ − ) ∘ 𝐹)
Assertion
Ref Expression
ovolfsval ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → (𝐺𝑁) = ((2nd ‘(𝐹𝑁)) − (1st ‘(𝐹𝑁))))

Proof of Theorem ovolfsval
StepHypRef Expression
1 ovolfs.1 . . . 4 𝐺 = ((abs ∘ − ) ∘ 𝐹)
21fveq1i 6104 . . 3 (𝐺𝑁) = (((abs ∘ − ) ∘ 𝐹)‘𝑁)
3 fvco3 6185 . . 3 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → (((abs ∘ − ) ∘ 𝐹)‘𝑁) = ((abs ∘ − )‘(𝐹𝑁)))
42, 3syl5eq 2656 . 2 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → (𝐺𝑁) = ((abs ∘ − )‘(𝐹𝑁)))
5 inss2 3796 . . . . . . 7 ( ≤ ∩ (ℝ × ℝ)) ⊆ (ℝ × ℝ)
6 ffvelrn 6265 . . . . . . 7 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → (𝐹𝑁) ∈ ( ≤ ∩ (ℝ × ℝ)))
75, 6sseldi 3566 . . . . . 6 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → (𝐹𝑁) ∈ (ℝ × ℝ))
8 1st2nd2 7096 . . . . . 6 ((𝐹𝑁) ∈ (ℝ × ℝ) → (𝐹𝑁) = ⟨(1st ‘(𝐹𝑁)), (2nd ‘(𝐹𝑁))⟩)
97, 8syl 17 . . . . 5 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → (𝐹𝑁) = ⟨(1st ‘(𝐹𝑁)), (2nd ‘(𝐹𝑁))⟩)
109fveq2d 6107 . . . 4 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → ((abs ∘ − )‘(𝐹𝑁)) = ((abs ∘ − )‘⟨(1st ‘(𝐹𝑁)), (2nd ‘(𝐹𝑁))⟩))
11 df-ov 6552 . . . 4 ((1st ‘(𝐹𝑁))(abs ∘ − )(2nd ‘(𝐹𝑁))) = ((abs ∘ − )‘⟨(1st ‘(𝐹𝑁)), (2nd ‘(𝐹𝑁))⟩)
1210, 11syl6eqr 2662 . . 3 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → ((abs ∘ − )‘(𝐹𝑁)) = ((1st ‘(𝐹𝑁))(abs ∘ − )(2nd ‘(𝐹𝑁))))
13 ovolfcl 23042 . . . . . . 7 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → ((1st ‘(𝐹𝑁)) ∈ ℝ ∧ (2nd ‘(𝐹𝑁)) ∈ ℝ ∧ (1st ‘(𝐹𝑁)) ≤ (2nd ‘(𝐹𝑁))))
1413simp1d 1066 . . . . . 6 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → (1st ‘(𝐹𝑁)) ∈ ℝ)
1514recnd 9947 . . . . 5 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → (1st ‘(𝐹𝑁)) ∈ ℂ)
1613simp2d 1067 . . . . . 6 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → (2nd ‘(𝐹𝑁)) ∈ ℝ)
1716recnd 9947 . . . . 5 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → (2nd ‘(𝐹𝑁)) ∈ ℂ)
18 eqid 2610 . . . . . 6 (abs ∘ − ) = (abs ∘ − )
1918cnmetdval 22384 . . . . 5 (((1st ‘(𝐹𝑁)) ∈ ℂ ∧ (2nd ‘(𝐹𝑁)) ∈ ℂ) → ((1st ‘(𝐹𝑁))(abs ∘ − )(2nd ‘(𝐹𝑁))) = (abs‘((1st ‘(𝐹𝑁)) − (2nd ‘(𝐹𝑁)))))
2015, 17, 19syl2anc 691 . . . 4 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → ((1st ‘(𝐹𝑁))(abs ∘ − )(2nd ‘(𝐹𝑁))) = (abs‘((1st ‘(𝐹𝑁)) − (2nd ‘(𝐹𝑁)))))
21 abssuble0 13916 . . . . 5 (((1st ‘(𝐹𝑁)) ∈ ℝ ∧ (2nd ‘(𝐹𝑁)) ∈ ℝ ∧ (1st ‘(𝐹𝑁)) ≤ (2nd ‘(𝐹𝑁))) → (abs‘((1st ‘(𝐹𝑁)) − (2nd ‘(𝐹𝑁)))) = ((2nd ‘(𝐹𝑁)) − (1st ‘(𝐹𝑁))))
2213, 21syl 17 . . . 4 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → (abs‘((1st ‘(𝐹𝑁)) − (2nd ‘(𝐹𝑁)))) = ((2nd ‘(𝐹𝑁)) − (1st ‘(𝐹𝑁))))
2320, 22eqtrd 2644 . . 3 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → ((1st ‘(𝐹𝑁))(abs ∘ − )(2nd ‘(𝐹𝑁))) = ((2nd ‘(𝐹𝑁)) − (1st ‘(𝐹𝑁))))
2412, 23eqtrd 2644 . 2 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → ((abs ∘ − )‘(𝐹𝑁)) = ((2nd ‘(𝐹𝑁)) − (1st ‘(𝐹𝑁))))
254, 24eqtrd 2644 1 ((𝐹:ℕ⟶( ≤ ∩ (ℝ × ℝ)) ∧ 𝑁 ∈ ℕ) → (𝐺𝑁) = ((2nd ‘(𝐹𝑁)) − (1st ‘(𝐹𝑁))))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 383   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977   ∩ cin 3539  ⟨cop 4131   class class class wbr 4583   × cxp 5036   ∘ ccom 5042  ⟶wf 5800  ‘cfv 5804  (class class class)co 6549  1st c1st 7057  2nd c2nd 7058  ℂcc 9813  ℝcr 9814   ≤ cle 9954   − cmin 10145  ℕcn 10897  abscabs 13822 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892  ax-pre-sup 9893 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-er 7629  df-en 7842  df-dom 7843  df-sdom 7844  df-sup 8231  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-div 10564  df-nn 10898  df-2 10956  df-3 10957  df-n0 11170  df-z 11255  df-uz 11564  df-rp 11709  df-seq 12664  df-exp 12723  df-cj 13687  df-re 13688  df-im 13689  df-sqrt 13823  df-abs 13824 This theorem is referenced by:  ovolfsf  23047  ovollb2lem  23063  ovolunlem1a  23071  ovoliunlem1  23077  ovolshftlem1  23084  ovolscalem1  23088  ovolicc1  23091  ovolicc2lem4  23095  ioombl1lem3  23135  ovolfs2  23145  uniioovol  23153  uniioombllem3  23159
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