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Theorem elxp 5682
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 5665 . . 3 (𝐵 × 𝐶) = {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐵𝑦𝐶)}
21eleq2i 2854 . 2 (𝐴 ∈ (𝐵 × 𝐶) ↔ 𝐴 ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐵𝑦𝐶)})
3 elopab 5509 . 2 (𝐴 ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐵𝑦𝐶)} ↔ ∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ (𝑥𝐵𝑦𝐶)))
42, 3bitri 278 1 (𝐴 ∈ (𝐵 × 𝐶) ↔ ∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ (𝑥𝐵𝑦𝐶)))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wb 209  wa 401   = wceq 1570  wex 1812  wcel 2145  cop 4593  {copab 5171   × cxp 5657
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2734  ax-sep 5255  ax-pr 5402
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-ex 1813  df-sb 2100  df-clab 2741  df-cleq 2754  df-clel 2837  df-rab 3415  df-v 3455  df-un 3907  df-in 3909  df-ss 3919  df-sn 4588  df-pr 4590  df-op 4594  df-opab 5172  df-xp 5665
This theorem is used by:  elxp2  5683  0nelxp  5693  0nelelxp  5694  rabxp  5707  elxp3  5725  elvv  5734  elvvv  5735  dfres3  5981  xpdifid  6164  xpdifcnvepel  6165  dfco2a  6246  elsnxp  6293  tpres  7204  elxp4  7923  elxp5  7924  opabex3d  7966  opabex3rd  7967  opabex3  7968  xp1st  8022  xp2nd  8023  poxp  8130  soxp  8131  xpsnen  9063  xpcomco  9069  xpassen  9073  dfac5lem1  10130  dfac5lem4  10133  axdc4lem  10461  fsum2dlem  15860  fprod2dlem  16073  mgmn0plusgf  18747  mgmn0plusgplusf  18748  numclwwlk1lem2fo  30846  satefvfmla0  36005  elima4  36363  brcart  36517  brimg  36522  dibelval3  42028
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