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Theorem itg2val 24032
Description: Value of the integral on nonnegative real functions. (Contributed by Mario Carneiro, 28-Jun-2014.)
Hypothesis
Ref Expression
itg2val.1 𝐿 = {𝑥 ∣ ∃𝑔 ∈ dom ∫1(𝑔𝑟𝐹𝑥 = (∫1𝑔))}
Assertion
Ref Expression
itg2val (𝐹:ℝ⟶(0[,]+∞) → (∫2𝐹) = sup(𝐿, ℝ*, < ))
Distinct variable group:   𝑥,𝑔,𝐹
Allowed substitution hints:   𝐿(𝑥,𝑔)

Proof of Theorem itg2val
Dummy variable 𝑓 is distinct from all other variables.
StepHypRef Expression
1 xrltso 12351 . . 3 < Or ℝ*
21supex 8722 . 2 sup(𝐿, ℝ*, < ) ∈ V
3 reex 10426 . 2 ℝ ∈ V
4 ovex 7008 . 2 (0[,]+∞) ∈ V
5 breq2 4933 . . . . . . 7 (𝑓 = 𝐹 → (𝑔𝑟𝑓𝑔𝑟𝐹))
65anbi1d 620 . . . . . 6 (𝑓 = 𝐹 → ((𝑔𝑟𝑓𝑥 = (∫1𝑔)) ↔ (𝑔𝑟𝐹𝑥 = (∫1𝑔))))
76rexbidv 3242 . . . . 5 (𝑓 = 𝐹 → (∃𝑔 ∈ dom ∫1(𝑔𝑟𝑓𝑥 = (∫1𝑔)) ↔ ∃𝑔 ∈ dom ∫1(𝑔𝑟𝐹𝑥 = (∫1𝑔))))
87abbidv 2843 . . . 4 (𝑓 = 𝐹 → {𝑥 ∣ ∃𝑔 ∈ dom ∫1(𝑔𝑟𝑓𝑥 = (∫1𝑔))} = {𝑥 ∣ ∃𝑔 ∈ dom ∫1(𝑔𝑟𝐹𝑥 = (∫1𝑔))})
9 itg2val.1 . . . 4 𝐿 = {𝑥 ∣ ∃𝑔 ∈ dom ∫1(𝑔𝑟𝐹𝑥 = (∫1𝑔))}
108, 9syl6eqr 2832 . . 3 (𝑓 = 𝐹 → {𝑥 ∣ ∃𝑔 ∈ dom ∫1(𝑔𝑟𝑓𝑥 = (∫1𝑔))} = 𝐿)
1110supeq1d 8705 . 2 (𝑓 = 𝐹 → sup({𝑥 ∣ ∃𝑔 ∈ dom ∫1(𝑔𝑟𝑓𝑥 = (∫1𝑔))}, ℝ*, < ) = sup(𝐿, ℝ*, < ))
12 df-itg2 23925 . 2 2 = (𝑓 ∈ ((0[,]+∞) ↑𝑚 ℝ) ↦ sup({𝑥 ∣ ∃𝑔 ∈ dom ∫1(𝑔𝑟𝑓𝑥 = (∫1𝑔))}, ℝ*, < ))
132, 3, 4, 11, 12fvmptmap 8244 1 (𝐹:ℝ⟶(0[,]+∞) → (∫2𝐹) = sup(𝐿, ℝ*, < ))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 387   = wceq 1507  {cab 2758  wrex 3089   class class class wbr 4929  dom cdm 5407  wf 6184  cfv 6188  (class class class)co 6976  𝑟 cofr 7226  supcsup 8699  cr 10334  0cc0 10335  +∞cpnf 10471  *cxr 10473   < clt 10474  cle 10475  [,]cicc 12557  1citg1 23919  2citg2 23920
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1758  ax-4 1772  ax-5 1869  ax-6 1928  ax-7 1965  ax-8 2052  ax-9 2059  ax-10 2079  ax-11 2093  ax-12 2106  ax-13 2301  ax-ext 2750  ax-sep 5060  ax-nul 5067  ax-pow 5119  ax-pr 5186  ax-un 7279  ax-cnex 10391  ax-resscn 10392  ax-pre-lttri 10409  ax-pre-lttrn 10410
This theorem depends on definitions:  df-bi 199  df-an 388  df-or 834  df-3or 1069  df-3an 1070  df-tru 1510  df-ex 1743  df-nf 1747  df-sb 2016  df-mo 2547  df-eu 2584  df-clab 2759  df-cleq 2771  df-clel 2846  df-nfc 2918  df-ne 2968  df-nel 3074  df-ral 3093  df-rex 3094  df-rmo 3096  df-rab 3097  df-v 3417  df-sbc 3682  df-csb 3787  df-dif 3832  df-un 3834  df-in 3836  df-ss 3843  df-nul 4179  df-if 4351  df-pw 4424  df-sn 4442  df-pr 4444  df-op 4448  df-uni 4713  df-br 4930  df-opab 4992  df-mpt 5009  df-id 5312  df-po 5326  df-so 5327  df-xp 5413  df-rel 5414  df-cnv 5415  df-co 5416  df-dm 5417  df-rn 5418  df-res 5419  df-ima 5420  df-iota 6152  df-fun 6190  df-fn 6191  df-f 6192  df-f1 6193  df-fo 6194  df-f1o 6195  df-fv 6196  df-ov 6979  df-oprab 6980  df-mpo 6981  df-er 8089  df-map 8208  df-en 8307  df-dom 8308  df-sdom 8309  df-sup 8701  df-pnf 10476  df-mnf 10477  df-xr 10478  df-ltxr 10479  df-itg2 23925
This theorem is referenced by:  itg2cl  24036  itg2ub  24037  itg2leub  24038  itg2addnclem  34390
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