Theorem itg2val 24332

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(𝑔 ∘r ≤ 𝐹 ∧ 𝑥 = (∫1‘𝑔))}

Assertion

Ref	Expression
itg2val	⊢ (𝐹:ℝ⟶(0[,]+∞) → (∫2‘𝐹) = 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.

Step	Hyp	Ref	Expression
1		xrltso 12537	. . 3 ⊢ < Or ℝ*
2	1	supex 8930	. 2 ⊢ sup(𝐿, ℝ*, < ) ∈ V
3		reex 10631	. 2 ⊢ ℝ ∈ V
4		ovex 7192	. 2 ⊢ (0[,]+∞) ∈ V
5		breq2 5073	. . . . . . 7 ⊢ (𝑓 = 𝐹 → (𝑔 ∘r ≤ 𝑓 ↔ 𝑔 ∘r ≤ 𝐹))
6	5	anbi1d 631	. . . . . 6 ⊢ (𝑓 = 𝐹 → ((𝑔 ∘r ≤ 𝑓 ∧ 𝑥 = (∫1‘𝑔)) ↔ (𝑔 ∘r ≤ 𝐹 ∧ 𝑥 = (∫1‘𝑔))))
7	6	rexbidv 3300	. . . . 5 ⊢ (𝑓 = 𝐹 → (∃𝑔 ∈ dom ∫1(𝑔 ∘r ≤ 𝑓 ∧ 𝑥 = (∫1‘𝑔)) ↔ ∃𝑔 ∈ dom ∫1(𝑔 ∘r ≤ 𝐹 ∧ 𝑥 = (∫1‘𝑔))))
8	7	abbidv 2888	. . . 4 ⊢ (𝑓 = 𝐹 → {𝑥 ∣ ∃𝑔 ∈ dom ∫1(𝑔 ∘r ≤ 𝑓 ∧ 𝑥 = (∫1‘𝑔))} = {𝑥 ∣ ∃𝑔 ∈ dom ∫1(𝑔 ∘r ≤ 𝐹 ∧ 𝑥 = (∫1‘𝑔))})
9		itg2val.1	. . . 4 ⊢ 𝐿 = {𝑥 ∣ ∃𝑔 ∈ dom ∫1(𝑔 ∘r ≤ 𝐹 ∧ 𝑥 = (∫1‘𝑔))}
10	8, 9	syl6eqr 2877	. . 3 ⊢ (𝑓 = 𝐹 → {𝑥 ∣ ∃𝑔 ∈ dom ∫1(𝑔 ∘r ≤ 𝑓 ∧ 𝑥 = (∫1‘𝑔))} = 𝐿)
11	10	supeq1d 8913	. 2 ⊢ (𝑓 = 𝐹 → sup({𝑥 ∣ ∃𝑔 ∈ dom ∫1(𝑔 ∘r ≤ 𝑓 ∧ 𝑥 = (∫1‘𝑔))}, ℝ*, < ) = sup(𝐿, ℝ*, < ))
12		df-itg2 24225	. 2 ⊢ ∫2 = (𝑓 ∈ ((0[,]+∞) ↑m ℝ) ↦ sup({𝑥 ∣ ∃𝑔 ∈ dom ∫1(𝑔 ∘r ≤ 𝑓 ∧ 𝑥 = (∫1‘𝑔))}, ℝ*, < ))
13	2, 3, 4, 11, 12	fvmptmap 8448	1 ⊢ (𝐹:ℝ⟶(0[,]+∞) → (∫2‘𝐹) = sup(𝐿, ℝ*, < ))

Syntax hints:   → wi 4   ∧ wa 398   = wceq 1536  {cab 2802  ∃wrex 3142   class class class wbr 5069  dom cdm 5558  ⟶wf 6354  ‘cfv 6358  (class class class)co 7159   ∘_r cofr 7411  supcsup 8907  ℝcr 10539  0cc0 10540  +∞cpnf 10675  ℝ^*cxr 10677   < clt 10678   ≤ cle 10679  [,]cicc 12744  ∫₁citg1 24219  ∫₂citg2 24220

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2160  ax-12 2176  ax-ext 2796  ax-sep 5206  ax-nul 5213  ax-pow 5269  ax-pr 5333  ax-un 7464  ax-cnex 10596  ax-resscn 10597  ax-pre-lttri 10614  ax-pre-lttrn 10615

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-mo 2621  df-eu 2653  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2966  df-ne 3020  df-nel 3127  df-ral 3146  df-rex 3147  df-rmo 3149  df-rab 3150  df-v 3499  df-sbc 3776  df-csb 3887  df-dif 3942  df-un 3944  df-in 3946  df-ss 3955  df-nul 4295  df-if 4471  df-pw 4544  df-sn 4571  df-pr 4573  df-op 4577  df-uni 4842  df-br 5070  df-opab 5132  df-mpt 5150  df-id 5463  df-po 5477  df-so 5478  df-xp 5564  df-rel 5565  df-cnv 5566  df-co 5567  df-dm 5568  df-rn 5569  df-res 5570  df-ima 5571  df-iota 6317  df-fun 6360  df-fn 6361  df-f 6362  df-f1 6363  df-fo 6364  df-f1o 6365  df-fv 6366  df-ov 7162  df-oprab 7163  df-mpo 7164  df-er 8292  df-map 8411  df-en 8513  df-dom 8514  df-sdom 8515  df-sup 8909  df-pnf 10680  df-mnf 10681  df-xr 10682  df-ltxr 10683  df-itg2 24225

This theorem is referenced by:  itg2cl  24336  itg2ub  24337  itg2leub  24338  itg2addnclem  34947