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Theorem itg1addlem2 23805
Description: Lemma for itg1add 23809. The function 𝐼 represents the pieces into which we will break up the domain of the sum. Since it is infinite only when both 𝑖 and 𝑗 are zero, we arbitrarily define it to be zero there to simplify the sums that are manipulated in itg1addlem4 23807 and itg1addlem5 23808. (Contributed by Mario Carneiro, 26-Jun-2014.)
Hypotheses
Ref Expression
i1fadd.1 (𝜑𝐹 ∈ dom ∫1)
i1fadd.2 (𝜑𝐺 ∈ dom ∫1)
itg1add.3 𝐼 = (𝑖 ∈ ℝ, 𝑗 ∈ ℝ ↦ if((𝑖 = 0 ∧ 𝑗 = 0), 0, (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})))))
Assertion
Ref Expression
itg1addlem2 (𝜑𝐼:(ℝ × ℝ)⟶ℝ)
Distinct variable groups:   𝑖,𝑗,𝐹   𝑖,𝐺,𝑗   𝜑,𝑖,𝑗
Allowed substitution hints:   𝐼(𝑖,𝑗)

Proof of Theorem itg1addlem2
StepHypRef Expression
1 iffalse 4286 . . . . . . . 8 (¬ (𝑖 = 0 ∧ 𝑗 = 0) → if((𝑖 = 0 ∧ 𝑗 = 0), 0, (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})))) = (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗}))))
21adantl 474 . . . . . . 7 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ ¬ (𝑖 = 0 ∧ 𝑗 = 0)) → if((𝑖 = 0 ∧ 𝑗 = 0), 0, (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})))) = (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗}))))
3 i1fadd.1 . . . . . . . . . . 11 (𝜑𝐹 ∈ dom ∫1)
4 i1fima 23786 . . . . . . . . . . 11 (𝐹 ∈ dom ∫1 → (𝐹 “ {𝑖}) ∈ dom vol)
53, 4syl 17 . . . . . . . . . 10 (𝜑 → (𝐹 “ {𝑖}) ∈ dom vol)
6 i1fadd.2 . . . . . . . . . . 11 (𝜑𝐺 ∈ dom ∫1)
7 i1fima 23786 . . . . . . . . . . 11 (𝐺 ∈ dom ∫1 → (𝐺 “ {𝑗}) ∈ dom vol)
86, 7syl 17 . . . . . . . . . 10 (𝜑 → (𝐺 “ {𝑗}) ∈ dom vol)
9 inmbl 23650 . . . . . . . . . 10 (((𝐹 “ {𝑖}) ∈ dom vol ∧ (𝐺 “ {𝑗}) ∈ dom vol) → ((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})) ∈ dom vol)
105, 8, 9syl2anc 580 . . . . . . . . 9 (𝜑 → ((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})) ∈ dom vol)
1110ad2antrr 718 . . . . . . . 8 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ ¬ (𝑖 = 0 ∧ 𝑗 = 0)) → ((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})) ∈ dom vol)
12 mblvol 23638 . . . . . . . 8 (((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})) ∈ dom vol → (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗}))) = (vol*‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗}))))
1311, 12syl 17 . . . . . . 7 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ ¬ (𝑖 = 0 ∧ 𝑗 = 0)) → (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗}))) = (vol*‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗}))))
142, 13eqtrd 2833 . . . . . 6 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ ¬ (𝑖 = 0 ∧ 𝑗 = 0)) → if((𝑖 = 0 ∧ 𝑗 = 0), 0, (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})))) = (vol*‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗}))))
15 neorian 3065 . . . . . . 7 ((𝑖 ≠ 0 ∨ 𝑗 ≠ 0) ↔ ¬ (𝑖 = 0 ∧ 𝑗 = 0))
16 inss1 4028 . . . . . . . . . 10 ((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})) ⊆ (𝐹 “ {𝑖})
1716a1i 11 . . . . . . . . 9 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑖 ≠ 0) → ((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})) ⊆ (𝐹 “ {𝑖}))
185ad2antrr 718 . . . . . . . . . 10 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑖 ≠ 0) → (𝐹 “ {𝑖}) ∈ dom vol)
19 mblss 23639 . . . . . . . . . 10 ((𝐹 “ {𝑖}) ∈ dom vol → (𝐹 “ {𝑖}) ⊆ ℝ)
2018, 19syl 17 . . . . . . . . 9 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑖 ≠ 0) → (𝐹 “ {𝑖}) ⊆ ℝ)
21 mblvol 23638 . . . . . . . . . . 11 ((𝐹 “ {𝑖}) ∈ dom vol → (vol‘(𝐹 “ {𝑖})) = (vol*‘(𝐹 “ {𝑖})))
2218, 21syl 17 . . . . . . . . . 10 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑖 ≠ 0) → (vol‘(𝐹 “ {𝑖})) = (vol*‘(𝐹 “ {𝑖})))
233ad2antrr 718 . . . . . . . . . . 11 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑖 ≠ 0) → 𝐹 ∈ dom ∫1)
24 simplrl 796 . . . . . . . . . . . 12 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑖 ≠ 0) → 𝑖 ∈ ℝ)
25 simpr 478 . . . . . . . . . . . 12 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑖 ≠ 0) → 𝑖 ≠ 0)
26 eldifsn 4506 . . . . . . . . . . . 12 (𝑖 ∈ (ℝ ∖ {0}) ↔ (𝑖 ∈ ℝ ∧ 𝑖 ≠ 0))
2724, 25, 26sylanbrc 579 . . . . . . . . . . 11 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑖 ≠ 0) → 𝑖 ∈ (ℝ ∖ {0}))
28 i1fima2sn 23788 . . . . . . . . . . 11 ((𝐹 ∈ dom ∫1𝑖 ∈ (ℝ ∖ {0})) → (vol‘(𝐹 “ {𝑖})) ∈ ℝ)
2923, 27, 28syl2anc 580 . . . . . . . . . 10 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑖 ≠ 0) → (vol‘(𝐹 “ {𝑖})) ∈ ℝ)
3022, 29eqeltrrd 2879 . . . . . . . . 9 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑖 ≠ 0) → (vol*‘(𝐹 “ {𝑖})) ∈ ℝ)
31 ovolsscl 23594 . . . . . . . . 9 ((((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})) ⊆ (𝐹 “ {𝑖}) ∧ (𝐹 “ {𝑖}) ⊆ ℝ ∧ (vol*‘(𝐹 “ {𝑖})) ∈ ℝ) → (vol*‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗}))) ∈ ℝ)
3217, 20, 30, 31syl3anc 1491 . . . . . . . 8 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑖 ≠ 0) → (vol*‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗}))) ∈ ℝ)
33 inss2 4029 . . . . . . . . . 10 ((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})) ⊆ (𝐺 “ {𝑗})
3433a1i 11 . . . . . . . . 9 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑗 ≠ 0) → ((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})) ⊆ (𝐺 “ {𝑗}))
356adantr 473 . . . . . . . . . . . 12 ((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) → 𝐺 ∈ dom ∫1)
3635, 7syl 17 . . . . . . . . . . 11 ((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) → (𝐺 “ {𝑗}) ∈ dom vol)
3736adantr 473 . . . . . . . . . 10 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑗 ≠ 0) → (𝐺 “ {𝑗}) ∈ dom vol)
38 mblss 23639 . . . . . . . . . 10 ((𝐺 “ {𝑗}) ∈ dom vol → (𝐺 “ {𝑗}) ⊆ ℝ)
3937, 38syl 17 . . . . . . . . 9 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑗 ≠ 0) → (𝐺 “ {𝑗}) ⊆ ℝ)
40 mblvol 23638 . . . . . . . . . . 11 ((𝐺 “ {𝑗}) ∈ dom vol → (vol‘(𝐺 “ {𝑗})) = (vol*‘(𝐺 “ {𝑗})))
4137, 40syl 17 . . . . . . . . . 10 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑗 ≠ 0) → (vol‘(𝐺 “ {𝑗})) = (vol*‘(𝐺 “ {𝑗})))
426ad2antrr 718 . . . . . . . . . . 11 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑗 ≠ 0) → 𝐺 ∈ dom ∫1)
43 simplrr 797 . . . . . . . . . . . 12 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑗 ≠ 0) → 𝑗 ∈ ℝ)
44 simpr 478 . . . . . . . . . . . 12 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑗 ≠ 0) → 𝑗 ≠ 0)
45 eldifsn 4506 . . . . . . . . . . . 12 (𝑗 ∈ (ℝ ∖ {0}) ↔ (𝑗 ∈ ℝ ∧ 𝑗 ≠ 0))
4643, 44, 45sylanbrc 579 . . . . . . . . . . 11 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑗 ≠ 0) → 𝑗 ∈ (ℝ ∖ {0}))
47 i1fima2sn 23788 . . . . . . . . . . 11 ((𝐺 ∈ dom ∫1𝑗 ∈ (ℝ ∖ {0})) → (vol‘(𝐺 “ {𝑗})) ∈ ℝ)
4842, 46, 47syl2anc 580 . . . . . . . . . 10 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑗 ≠ 0) → (vol‘(𝐺 “ {𝑗})) ∈ ℝ)
4941, 48eqeltrrd 2879 . . . . . . . . 9 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑗 ≠ 0) → (vol*‘(𝐺 “ {𝑗})) ∈ ℝ)
50 ovolsscl 23594 . . . . . . . . 9 ((((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})) ⊆ (𝐺 “ {𝑗}) ∧ (𝐺 “ {𝑗}) ⊆ ℝ ∧ (vol*‘(𝐺 “ {𝑗})) ∈ ℝ) → (vol*‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗}))) ∈ ℝ)
5134, 39, 49, 50syl3anc 1491 . . . . . . . 8 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ 𝑗 ≠ 0) → (vol*‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗}))) ∈ ℝ)
5232, 51jaodan 981 . . . . . . 7 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ (𝑖 ≠ 0 ∨ 𝑗 ≠ 0)) → (vol*‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗}))) ∈ ℝ)
5315, 52sylan2br 589 . . . . . 6 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ ¬ (𝑖 = 0 ∧ 𝑗 = 0)) → (vol*‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗}))) ∈ ℝ)
5414, 53eqeltrd 2878 . . . . 5 (((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) ∧ ¬ (𝑖 = 0 ∧ 𝑗 = 0)) → if((𝑖 = 0 ∧ 𝑗 = 0), 0, (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})))) ∈ ℝ)
5554ex 402 . . . 4 ((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) → (¬ (𝑖 = 0 ∧ 𝑗 = 0) → if((𝑖 = 0 ∧ 𝑗 = 0), 0, (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})))) ∈ ℝ))
56 iftrue 4283 . . . . 5 ((𝑖 = 0 ∧ 𝑗 = 0) → if((𝑖 = 0 ∧ 𝑗 = 0), 0, (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})))) = 0)
57 0re 10330 . . . . 5 0 ∈ ℝ
5856, 57syl6eqel 2886 . . . 4 ((𝑖 = 0 ∧ 𝑗 = 0) → if((𝑖 = 0 ∧ 𝑗 = 0), 0, (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})))) ∈ ℝ)
5955, 58pm2.61d2 174 . . 3 ((𝜑 ∧ (𝑖 ∈ ℝ ∧ 𝑗 ∈ ℝ)) → if((𝑖 = 0 ∧ 𝑗 = 0), 0, (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})))) ∈ ℝ)
6059ralrimivva 3152 . 2 (𝜑 → ∀𝑖 ∈ ℝ ∀𝑗 ∈ ℝ if((𝑖 = 0 ∧ 𝑗 = 0), 0, (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})))) ∈ ℝ)
61 itg1add.3 . . 3 𝐼 = (𝑖 ∈ ℝ, 𝑗 ∈ ℝ ↦ if((𝑖 = 0 ∧ 𝑗 = 0), 0, (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})))))
6261fmpt2 7473 . 2 (∀𝑖 ∈ ℝ ∀𝑗 ∈ ℝ if((𝑖 = 0 ∧ 𝑗 = 0), 0, (vol‘((𝐹 “ {𝑖}) ∩ (𝐺 “ {𝑗})))) ∈ ℝ ↔ 𝐼:(ℝ × ℝ)⟶ℝ)
6360, 62sylib 210 1 (𝜑𝐼:(ℝ × ℝ)⟶ℝ)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 385  wo 874   = wceq 1653  wcel 2157  wne 2971  wral 3089  cdif 3766  cin 3768  wss 3769  ifcif 4277  {csn 4368   × cxp 5310  ccnv 5311  dom cdm 5312  cima 5315  wf 6097  cfv 6101  cmpt2 6880  cr 10223  0cc0 10224  vol*covol 23570  volcvol 23571  1citg1 23723
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1891  ax-4 1905  ax-5 2006  ax-6 2072  ax-7 2107  ax-8 2159  ax-9 2166  ax-10 2185  ax-11 2200  ax-12 2213  ax-13 2377  ax-ext 2777  ax-rep 4964  ax-sep 4975  ax-nul 4983  ax-pow 5035  ax-pr 5097  ax-un 7183  ax-inf2 8788  ax-cnex 10280  ax-resscn 10281  ax-1cn 10282  ax-icn 10283  ax-addcl 10284  ax-addrcl 10285  ax-mulcl 10286  ax-mulrcl 10287  ax-mulcom 10288  ax-addass 10289  ax-mulass 10290  ax-distr 10291  ax-i2m1 10292  ax-1ne0 10293  ax-1rid 10294  ax-rnegex 10295  ax-rrecex 10296  ax-cnre 10297  ax-pre-lttri 10298  ax-pre-lttrn 10299  ax-pre-ltadd 10300  ax-pre-mulgt0 10301  ax-pre-sup 10302
This theorem depends on definitions:  df-bi 199  df-an 386  df-or 875  df-3or 1109  df-3an 1110  df-tru 1657  df-fal 1667  df-ex 1876  df-nf 1880  df-sb 2065  df-mo 2591  df-eu 2609  df-clab 2786  df-cleq 2792  df-clel 2795  df-nfc 2930  df-ne 2972  df-nel 3075  df-ral 3094  df-rex 3095  df-reu 3096  df-rmo 3097  df-rab 3098  df-v 3387  df-sbc 3634  df-csb 3729  df-dif 3772  df-un 3774  df-in 3776  df-ss 3783  df-pss 3785  df-nul 4116  df-if 4278  df-pw 4351  df-sn 4369  df-pr 4371  df-tp 4373  df-op 4375  df-uni 4629  df-int 4668  df-iun 4712  df-br 4844  df-opab 4906  df-mpt 4923  df-tr 4946  df-id 5220  df-eprel 5225  df-po 5233  df-so 5234  df-fr 5271  df-se 5272  df-we 5273  df-xp 5318  df-rel 5319  df-cnv 5320  df-co 5321  df-dm 5322  df-rn 5323  df-res 5324  df-ima 5325  df-pred 5898  df-ord 5944  df-on 5945  df-lim 5946  df-suc 5947  df-iota 6064  df-fun 6103  df-fn 6104  df-f 6105  df-f1 6106  df-fo 6107  df-f1o 6108  df-fv 6109  df-isom 6110  df-riota 6839  df-ov 6881  df-oprab 6882  df-mpt2 6883  df-of 7131  df-om 7300  df-1st 7401  df-2nd 7402  df-wrecs 7645  df-recs 7707  df-rdg 7745  df-1o 7799  df-2o 7800  df-oadd 7803  df-er 7982  df-map 8097  df-pm 8098  df-en 8196  df-dom 8197  df-sdom 8198  df-fin 8199  df-sup 8590  df-inf 8591  df-oi 8657  df-card 9051  df-cda 9278  df-pnf 10365  df-mnf 10366  df-xr 10367  df-ltxr 10368  df-le 10369  df-sub 10558  df-neg 10559  df-div 10977  df-nn 11313  df-2 11376  df-3 11377  df-n0 11581  df-z 11667  df-uz 11931  df-q 12034  df-rp 12075  df-xadd 12194  df-ioo 12428  df-ico 12430  df-icc 12431  df-fz 12581  df-fzo 12721  df-fl 12848  df-seq 13056  df-exp 13115  df-hash 13371  df-cj 14180  df-re 14181  df-im 14182  df-sqrt 14316  df-abs 14317  df-clim 14560  df-sum 14758  df-xmet 20061  df-met 20062  df-ovol 23572  df-vol 23573  df-mbf 23727  df-itg1 23728
This theorem is referenced by:  itg1addlem4  23807  itg1addlem5  23808
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