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Theorem ixxin 12438
Description: Intersection of two intervals of extended reals. (Contributed by Mario Carneiro, 3-Nov-2013.)
Hypotheses
Ref Expression
ixx.1 𝑂 = (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ {𝑧 ∈ ℝ* ∣ (𝑥𝑅𝑧𝑧𝑆𝑦)})
ixxin.2 ((𝐴 ∈ ℝ*𝐶 ∈ ℝ*𝑧 ∈ ℝ*) → (if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧 ↔ (𝐴𝑅𝑧𝐶𝑅𝑧)))
ixxin.3 ((𝑧 ∈ ℝ*𝐵 ∈ ℝ*𝐷 ∈ ℝ*) → (𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷) ↔ (𝑧𝑆𝐵𝑧𝑆𝐷)))
Assertion
Ref Expression
ixxin (((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) ∧ (𝐶 ∈ ℝ*𝐷 ∈ ℝ*)) → ((𝐴𝑂𝐵) ∩ (𝐶𝑂𝐷)) = (if(𝐴𝐶, 𝐶, 𝐴)𝑂if(𝐵𝐷, 𝐵, 𝐷)))
Distinct variable groups:   𝑥,𝑦,𝑧,𝐴   𝑥,𝐶,𝑦,𝑧   𝑥,𝐷,𝑦,𝑧   𝑥,𝐵,𝑦,𝑧   𝑥,𝑅,𝑦,𝑧   𝑥,𝑆,𝑦,𝑧
Allowed substitution hints:   𝑂(𝑥,𝑦,𝑧)

Proof of Theorem ixxin
StepHypRef Expression
1 inrab 4098 . . 3 ({𝑧 ∈ ℝ* ∣ (𝐴𝑅𝑧𝑧𝑆𝐵)} ∩ {𝑧 ∈ ℝ* ∣ (𝐶𝑅𝑧𝑧𝑆𝐷)}) = {𝑧 ∈ ℝ* ∣ ((𝐴𝑅𝑧𝑧𝑆𝐵) ∧ (𝐶𝑅𝑧𝑧𝑆𝐷))}
2 ixx.1 . . . . 5 𝑂 = (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ {𝑧 ∈ ℝ* ∣ (𝑥𝑅𝑧𝑧𝑆𝑦)})
32ixxval 12429 . . . 4 ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) → (𝐴𝑂𝐵) = {𝑧 ∈ ℝ* ∣ (𝐴𝑅𝑧𝑧𝑆𝐵)})
42ixxval 12429 . . . 4 ((𝐶 ∈ ℝ*𝐷 ∈ ℝ*) → (𝐶𝑂𝐷) = {𝑧 ∈ ℝ* ∣ (𝐶𝑅𝑧𝑧𝑆𝐷)})
53, 4ineqan12d 4013 . . 3 (((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) ∧ (𝐶 ∈ ℝ*𝐷 ∈ ℝ*)) → ((𝐴𝑂𝐵) ∩ (𝐶𝑂𝐷)) = ({𝑧 ∈ ℝ* ∣ (𝐴𝑅𝑧𝑧𝑆𝐵)} ∩ {𝑧 ∈ ℝ* ∣ (𝐶𝑅𝑧𝑧𝑆𝐷)}))
6 ixxin.2 . . . . . . . . 9 ((𝐴 ∈ ℝ*𝐶 ∈ ℝ*𝑧 ∈ ℝ*) → (if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧 ↔ (𝐴𝑅𝑧𝐶𝑅𝑧)))
763expa 1148 . . . . . . . 8 (((𝐴 ∈ ℝ*𝐶 ∈ ℝ*) ∧ 𝑧 ∈ ℝ*) → (if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧 ↔ (𝐴𝑅𝑧𝐶𝑅𝑧)))
87adantlr 707 . . . . . . 7 ((((𝐴 ∈ ℝ*𝐶 ∈ ℝ*) ∧ (𝐵 ∈ ℝ*𝐷 ∈ ℝ*)) ∧ 𝑧 ∈ ℝ*) → (if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧 ↔ (𝐴𝑅𝑧𝐶𝑅𝑧)))
9 ixxin.3 . . . . . . . . . 10 ((𝑧 ∈ ℝ*𝐵 ∈ ℝ*𝐷 ∈ ℝ*) → (𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷) ↔ (𝑧𝑆𝐵𝑧𝑆𝐷)))
1093expb 1150 . . . . . . . . 9 ((𝑧 ∈ ℝ* ∧ (𝐵 ∈ ℝ*𝐷 ∈ ℝ*)) → (𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷) ↔ (𝑧𝑆𝐵𝑧𝑆𝐷)))
1110ancoms 451 . . . . . . . 8 (((𝐵 ∈ ℝ*𝐷 ∈ ℝ*) ∧ 𝑧 ∈ ℝ*) → (𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷) ↔ (𝑧𝑆𝐵𝑧𝑆𝐷)))
1211adantll 706 . . . . . . 7 ((((𝐴 ∈ ℝ*𝐶 ∈ ℝ*) ∧ (𝐵 ∈ ℝ*𝐷 ∈ ℝ*)) ∧ 𝑧 ∈ ℝ*) → (𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷) ↔ (𝑧𝑆𝐵𝑧𝑆𝐷)))
138, 12anbi12d 625 . . . . . 6 ((((𝐴 ∈ ℝ*𝐶 ∈ ℝ*) ∧ (𝐵 ∈ ℝ*𝐷 ∈ ℝ*)) ∧ 𝑧 ∈ ℝ*) → ((if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷)) ↔ ((𝐴𝑅𝑧𝐶𝑅𝑧) ∧ (𝑧𝑆𝐵𝑧𝑆𝐷))))
14 an4 647 . . . . . 6 (((𝐴𝑅𝑧𝑧𝑆𝐵) ∧ (𝐶𝑅𝑧𝑧𝑆𝐷)) ↔ ((𝐴𝑅𝑧𝐶𝑅𝑧) ∧ (𝑧𝑆𝐵𝑧𝑆𝐷)))
1513, 14syl6bbr 281 . . . . 5 ((((𝐴 ∈ ℝ*𝐶 ∈ ℝ*) ∧ (𝐵 ∈ ℝ*𝐷 ∈ ℝ*)) ∧ 𝑧 ∈ ℝ*) → ((if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷)) ↔ ((𝐴𝑅𝑧𝑧𝑆𝐵) ∧ (𝐶𝑅𝑧𝑧𝑆𝐷))))
1615rabbidva 3371 . . . 4 (((𝐴 ∈ ℝ*𝐶 ∈ ℝ*) ∧ (𝐵 ∈ ℝ*𝐷 ∈ ℝ*)) → {𝑧 ∈ ℝ* ∣ (if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷))} = {𝑧 ∈ ℝ* ∣ ((𝐴𝑅𝑧𝑧𝑆𝐵) ∧ (𝐶𝑅𝑧𝑧𝑆𝐷))})
1716an4s 651 . . 3 (((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) ∧ (𝐶 ∈ ℝ*𝐷 ∈ ℝ*)) → {𝑧 ∈ ℝ* ∣ (if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷))} = {𝑧 ∈ ℝ* ∣ ((𝐴𝑅𝑧𝑧𝑆𝐵) ∧ (𝐶𝑅𝑧𝑧𝑆𝐷))})
181, 5, 173eqtr4a 2858 . 2 (((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) ∧ (𝐶 ∈ ℝ*𝐷 ∈ ℝ*)) → ((𝐴𝑂𝐵) ∩ (𝐶𝑂𝐷)) = {𝑧 ∈ ℝ* ∣ (if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷))})
19 ifcl 4320 . . . . 5 ((𝐶 ∈ ℝ*𝐴 ∈ ℝ*) → if(𝐴𝐶, 𝐶, 𝐴) ∈ ℝ*)
2019ancoms 451 . . . 4 ((𝐴 ∈ ℝ*𝐶 ∈ ℝ*) → if(𝐴𝐶, 𝐶, 𝐴) ∈ ℝ*)
21 ifcl 4320 . . . 4 ((𝐵 ∈ ℝ*𝐷 ∈ ℝ*) → if(𝐵𝐷, 𝐵, 𝐷) ∈ ℝ*)
222ixxval 12429 . . . 4 ((if(𝐴𝐶, 𝐶, 𝐴) ∈ ℝ* ∧ if(𝐵𝐷, 𝐵, 𝐷) ∈ ℝ*) → (if(𝐴𝐶, 𝐶, 𝐴)𝑂if(𝐵𝐷, 𝐵, 𝐷)) = {𝑧 ∈ ℝ* ∣ (if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷))})
2320, 21, 22syl2an 590 . . 3 (((𝐴 ∈ ℝ*𝐶 ∈ ℝ*) ∧ (𝐵 ∈ ℝ*𝐷 ∈ ℝ*)) → (if(𝐴𝐶, 𝐶, 𝐴)𝑂if(𝐵𝐷, 𝐵, 𝐷)) = {𝑧 ∈ ℝ* ∣ (if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷))})
2423an4s 651 . 2 (((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) ∧ (𝐶 ∈ ℝ*𝐷 ∈ ℝ*)) → (if(𝐴𝐶, 𝐶, 𝐴)𝑂if(𝐵𝐷, 𝐵, 𝐷)) = {𝑧 ∈ ℝ* ∣ (if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷))})
2518, 24eqtr4d 2835 1 (((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) ∧ (𝐶 ∈ ℝ*𝐷 ∈ ℝ*)) → ((𝐴𝑂𝐵) ∩ (𝐶𝑂𝐷)) = (if(𝐴𝐶, 𝐶, 𝐴)𝑂if(𝐵𝐷, 𝐵, 𝐷)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 198  wa 385  w3a 1108   = wceq 1653  wcel 2157  {crab 3092  cin 3767  ifcif 4276   class class class wbr 4842  (class class class)co 6877  cmpt2 6879  *cxr 10361  cle 10363
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 2776  ax-sep 4974  ax-nul 4982  ax-pr 5096  ax-un 7182  ax-cnex 10279  ax-resscn 10280
This theorem depends on definitions:  df-bi 199  df-an 386  df-or 875  df-3an 1110  df-tru 1657  df-ex 1876  df-nf 1880  df-sb 2065  df-mo 2591  df-eu 2609  df-clab 2785  df-cleq 2791  df-clel 2794  df-nfc 2929  df-ral 3093  df-rex 3094  df-rab 3097  df-v 3386  df-sbc 3633  df-dif 3771  df-un 3773  df-in 3775  df-ss 3782  df-nul 4115  df-if 4277  df-sn 4368  df-pr 4370  df-op 4374  df-uni 4628  df-br 4843  df-opab 4905  df-id 5219  df-xp 5317  df-rel 5318  df-cnv 5319  df-co 5320  df-dm 5321  df-iota 6063  df-fun 6102  df-fv 6108  df-ov 6880  df-oprab 6881  df-mpt2 6882  df-xr 10366
This theorem is referenced by:  iooin  12455  itgspliticc  23941  cvmliftlem10  31786
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