Theorem itg2val 25685

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 13055	. . 3 ⊢ < Or ℝ*
2	1	supex 9367	. 2 ⊢ sup(𝐿, ℝ*, < ) ∈ V
3		reex 11117	. 2 ⊢ ℝ ∈ V
4		ovex 7391	. 2 ⊢ (0[,]+∞) ∈ V
5		breq2 5102	. . . . . . 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 3160	. . . . 5 ⊢ (𝑓 = 𝐹 → (∃𝑔 ∈ dom ∫1(𝑔 ∘r ≤ 𝑓 ∧ 𝑥 = (∫1‘𝑔)) ↔ ∃𝑔 ∈ dom ∫1(𝑔 ∘r ≤ 𝐹 ∧ 𝑥 = (∫1‘𝑔))))
8	7	abbidv 2802	. . . 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	eqtr4di 2789	. . 3 ⊢ (𝑓 = 𝐹 → {𝑥 ∣ ∃𝑔 ∈ dom ∫1(𝑔 ∘r ≤ 𝑓 ∧ 𝑥 = (∫1‘𝑔))} = 𝐿)
11	10	supeq1d 9349	. 2 ⊢ (𝑓 = 𝐹 → sup({𝑥 ∣ ∃𝑔 ∈ dom ∫1(𝑔 ∘r ≤ 𝑓 ∧ 𝑥 = (∫1‘𝑔))}, ℝ*, < ) = sup(𝐿, ℝ*, < ))
12		df-itg2 25578	. 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 8819	1 ⊢ (𝐹:ℝ⟶(0[,]+∞) → (∫2‘𝐹) = sup(𝐿, ℝ*, < ))

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1541  {cab 2714  ∃wrex 3060   class class class wbr 5098  dom cdm 5624  ⟶wf 6488  ‘cfv 6492  (class class class)co 7358   ∘_r cofr 7621  supcsup 9343  ℝcr 11025  0cc0 11026  +∞cpnf 11163  ℝ^*cxr 11165   < clt 11166   ≤ cle 11167  [,]cicc 13264  ∫₁citg1 25572  ∫₂citg2 25573

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-10 2146  ax-11 2162  ax-12 2184  ax-ext 2708  ax-sep 5241  ax-nul 5251  ax-pow 5310  ax-pr 5377  ax-un 7680  ax-cnex 11082  ax-resscn 11083  ax-pre-lttri 11100  ax-pre-lttrn 11101

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-nel 3037  df-ral 3052  df-rex 3061  df-rmo 3350  df-rab 3400  df-v 3442  df-sbc 3741  df-csb 3850  df-dif 3904  df-un 3906  df-in 3908  df-ss 3918  df-nul 4286  df-if 4480  df-pw 4556  df-sn 4581  df-pr 4583  df-op 4587  df-uni 4864  df-br 5099  df-opab 5161  df-mpt 5180  df-id 5519  df-po 5532  df-so 5533  df-xp 5630  df-rel 5631  df-cnv 5632  df-co 5633  df-dm 5634  df-rn 5635  df-res 5636  df-ima 5637  df-iota 6448  df-fun 6494  df-fn 6495  df-f 6496  df-f1 6497  df-fo 6498  df-f1o 6499  df-fv 6500  df-ov 7361  df-oprab 7362  df-mpo 7363  df-er 8635  df-map 8765  df-en 8884  df-dom 8885  df-sdom 8886  df-sup 9345  df-pnf 11168  df-mnf 11169  df-xr 11170  df-ltxr 11171  df-itg2 25578

This theorem is referenced by:  itg2cl  25689  itg2ub  25690  itg2leub  25691  itg2addnclem  37868