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

Theorem elxp 5698
Description: Membership in a Cartesian product. (Contributed by NM, 4-Jul-1994.)
Assertion
Ref Expression
elxp (𝐴 ∈ (𝐵 × 𝐶) ↔ ∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ (𝑥𝐵𝑦𝐶)))
Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝐵,𝑦   𝑥,𝐶,𝑦

Proof of Theorem elxp
StepHypRef Expression
1 df-xp 5681 . . 3 (𝐵 × 𝐶) = {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐵𝑦𝐶)}
21eleq2i 2825 . 2 (𝐴 ∈ (𝐵 × 𝐶) ↔ 𝐴 ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐵𝑦𝐶)})
3 elopab 5526 . 2 (𝐴 ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐵𝑦𝐶)} ↔ ∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ (𝑥𝐵𝑦𝐶)))
42, 3bitri 274 1 (𝐴 ∈ (𝐵 × 𝐶) ↔ ∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ (𝑥𝐵𝑦𝐶)))
Colors of variables: wff setvar class
Syntax hints:  wb 205  wa 396   = wceq 1541  wex 1781  wcel 2106  cop 4633  {copab 5209   × cxp 5673
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-ext 2703  ax-sep 5298  ax-nul 5305  ax-pr 5426
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-sb 2068  df-clab 2710  df-cleq 2724  df-clel 2810  df-v 3476  df-dif 3950  df-un 3952  df-in 3954  df-ss 3964  df-nul 4322  df-if 4528  df-sn 4628  df-pr 4630  df-op 4634  df-opab 5210  df-xp 5681
This theorem is referenced by:  elxp2  5699  0nelxp  5709  0nelelxp  5710  rabxp  5722  elxp3  5740  elvv  5748  elvvv  5749  0xp  5772  dfres3  5984  xpdifid  6164  dfco2a  6242  elsnxp  6287  tpres  7198  elxp4  7909  elxp5  7910  opabex3d  7948  opabex3rd  7949  opabex3  7950  xp1st  8003  xp2nd  8004  poxp  8110  soxp  8111  xpsnen  9051  xpcomco  9058  xpassen  9062  dfac5lem1  10114  dfac5lem4  10117  axdc4lem  10446  fsum2dlem  15712  fprod2dlem  15920  numclwwlk1lem2fo  29600  satefvfmla0  34397  elima4  34735  brcart  34892  brimg  34897  dibelval3  40006
  Copyright terms: Public domain W3C validator