MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  ixxin Structured version   Visualization version   GIF version

Theorem ixxin 12405
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 4042 . . 3 ({𝑧 ∈ ℝ* ∣ (𝐴𝑅𝑧𝑧𝑆𝐵)} ∩ {𝑧 ∈ ℝ* ∣ (𝐶𝑅𝑧𝑧𝑆𝐷)}) = {𝑧 ∈ ℝ* ∣ ((𝐴𝑅𝑧𝑧𝑆𝐵) ∧ (𝐶𝑅𝑧𝑧𝑆𝐷))}
2 ixx.1 . . . . 5 𝑂 = (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ {𝑧 ∈ ℝ* ∣ (𝑥𝑅𝑧𝑧𝑆𝑦)})
32ixxval 12396 . . . 4 ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) → (𝐴𝑂𝐵) = {𝑧 ∈ ℝ* ∣ (𝐴𝑅𝑧𝑧𝑆𝐵)})
42ixxval 12396 . . . 4 ((𝐶 ∈ ℝ*𝐷 ∈ ℝ*) → (𝐶𝑂𝐷) = {𝑧 ∈ ℝ* ∣ (𝐶𝑅𝑧𝑧𝑆𝐷)})
53, 4ineqan12d 3959 . . 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 1112 . . . . . . . 8 (((𝐴 ∈ ℝ*𝐶 ∈ ℝ*) ∧ 𝑧 ∈ ℝ*) → (if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧 ↔ (𝐴𝑅𝑧𝐶𝑅𝑧)))
87adantlr 753 . . . . . . 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 1114 . . . . . . . . 9 ((𝑧 ∈ ℝ* ∧ (𝐵 ∈ ℝ*𝐷 ∈ ℝ*)) → (𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷) ↔ (𝑧𝑆𝐵𝑧𝑆𝐷)))
1110ancoms 468 . . . . . . . 8 (((𝐵 ∈ ℝ*𝐷 ∈ ℝ*) ∧ 𝑧 ∈ ℝ*) → (𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷) ↔ (𝑧𝑆𝐵𝑧𝑆𝐷)))
1211adantll 752 . . . . . . 7 ((((𝐴 ∈ ℝ*𝐶 ∈ ℝ*) ∧ (𝐵 ∈ ℝ*𝐷 ∈ ℝ*)) ∧ 𝑧 ∈ ℝ*) → (𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷) ↔ (𝑧𝑆𝐵𝑧𝑆𝐷)))
138, 12anbi12d 749 . . . . . 6 ((((𝐴 ∈ ℝ*𝐶 ∈ ℝ*) ∧ (𝐵 ∈ ℝ*𝐷 ∈ ℝ*)) ∧ 𝑧 ∈ ℝ*) → ((if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷)) ↔ ((𝐴𝑅𝑧𝐶𝑅𝑧) ∧ (𝑧𝑆𝐵𝑧𝑆𝐷))))
14 an4 900 . . . . . 6 (((𝐴𝑅𝑧𝑧𝑆𝐵) ∧ (𝐶𝑅𝑧𝑧𝑆𝐷)) ↔ ((𝐴𝑅𝑧𝐶𝑅𝑧) ∧ (𝑧𝑆𝐵𝑧𝑆𝐷)))
1513, 14syl6bbr 278 . . . . 5 ((((𝐴 ∈ ℝ*𝐶 ∈ ℝ*) ∧ (𝐵 ∈ ℝ*𝐷 ∈ ℝ*)) ∧ 𝑧 ∈ ℝ*) → ((if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷)) ↔ ((𝐴𝑅𝑧𝑧𝑆𝐵) ∧ (𝐶𝑅𝑧𝑧𝑆𝐷))))
1615rabbidva 3328 . . . 4 (((𝐴 ∈ ℝ*𝐶 ∈ ℝ*) ∧ (𝐵 ∈ ℝ*𝐷 ∈ ℝ*)) → {𝑧 ∈ ℝ* ∣ (if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷))} = {𝑧 ∈ ℝ* ∣ ((𝐴𝑅𝑧𝑧𝑆𝐵) ∧ (𝐶𝑅𝑧𝑧𝑆𝐷))})
1716an4s 904 . . 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 2820 . 2 (((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) ∧ (𝐶 ∈ ℝ*𝐷 ∈ ℝ*)) → ((𝐴𝑂𝐵) ∩ (𝐶𝑂𝐷)) = {𝑧 ∈ ℝ* ∣ (if(𝐴𝐶, 𝐶, 𝐴)𝑅𝑧𝑧𝑆if(𝐵𝐷, 𝐵, 𝐷))})
19 ifcl 4274 . . . . 5 ((𝐶 ∈ ℝ*𝐴 ∈ ℝ*) → if(𝐴𝐶, 𝐶, 𝐴) ∈ ℝ*)
2019ancoms 468 . . . 4 ((𝐴 ∈ ℝ*𝐶 ∈ ℝ*) → if(𝐴𝐶, 𝐶, 𝐴) ∈ ℝ*)
21 ifcl 4274 . . . 4 ((𝐵 ∈ ℝ*𝐷 ∈ ℝ*) → if(𝐵𝐷, 𝐵, 𝐷) ∈ ℝ*)
222ixxval 12396 . . . 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 495 . . 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 904 . 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 2797 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 196  wa 383  w3a 1072   = wceq 1632  wcel 2139  {crab 3054  cin 3714  ifcif 4230   class class class wbr 4804  (class class class)co 6814  cmpt2 6816  *cxr 10285  cle 10287
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1988  ax-6 2054  ax-7 2090  ax-8 2141  ax-9 2148  ax-10 2168  ax-11 2183  ax-12 2196  ax-13 2391  ax-ext 2740  ax-sep 4933  ax-nul 4941  ax-pr 5055  ax-un 7115  ax-cnex 10204  ax-resscn 10205
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1074  df-tru 1635  df-ex 1854  df-nf 1859  df-sb 2047  df-eu 2611  df-mo 2612  df-clab 2747  df-cleq 2753  df-clel 2756  df-nfc 2891  df-ral 3055  df-rex 3056  df-rab 3059  df-v 3342  df-sbc 3577  df-dif 3718  df-un 3720  df-in 3722  df-ss 3729  df-nul 4059  df-if 4231  df-sn 4322  df-pr 4324  df-op 4328  df-uni 4589  df-br 4805  df-opab 4865  df-id 5174  df-xp 5272  df-rel 5273  df-cnv 5274  df-co 5275  df-dm 5276  df-iota 6012  df-fun 6051  df-fv 6057  df-ov 6817  df-oprab 6818  df-mpt2 6819  df-xr 10290
This theorem is referenced by:  iooin  12422  itgspliticc  23822  cvmliftlem10  31604
  Copyright terms: Public domain W3C validator