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Theorem elxp 4680
Description: Membership in a cross 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 4669 . . 3 (𝐵 × 𝐶) = {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐵𝑦𝐶)}
21eleq2i 2263 . 2 (𝐴 ∈ (𝐵 × 𝐶) ↔ 𝐴 ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐵𝑦𝐶)})
3 elopab 4292 . 2 (𝐴 ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐵𝑦𝐶)} ↔ ∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ (𝑥𝐵𝑦𝐶)))
42, 3bitri 184 1 (𝐴 ∈ (𝐵 × 𝐶) ↔ ∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ (𝑥𝐵𝑦𝐶)))
Colors of variables: wff set class
Syntax hints:  wa 104  wb 105   = wceq 1364  wex 1506  wcel 2167  cop 3625  {copab 4093   × cxp 4661
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-14 2170  ax-ext 2178  ax-sep 4151  ax-pow 4207  ax-pr 4242
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-v 2765  df-un 3161  df-in 3163  df-ss 3170  df-pw 3607  df-sn 3628  df-pr 3629  df-op 3631  df-opab 4095  df-xp 4669
This theorem is referenced by:  elxp2  4681  0nelxp  4691  0nelelxp  4692  rabxp  4700  elxp3  4717  elvv  4725  elvvv  4726  0xp  4743  xpmlem  5090  elxp4  5157  elxp5  5158  dfco2a  5170  opabex3d  6178  opabex3  6179  xp1st  6223  xp2nd  6224  poxp  6290  xpsnen  6880  xpcomco  6885  xpassen  6889  nqnq0pi  7505  fsum2dlemstep  11599  fprod2dlemstep  11787
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