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Theorem elxpk2 4197
 Description: Membership in a cross product. (Contributed by SF, 12-Jan-2015.)
Assertion
Ref Expression
elxpk2 k
Distinct variable groups:   ,,   ,,   ,,

Proof of Theorem elxpk2
StepHypRef Expression
1 ancom 437 . . 3
212exbii 1583 . 2
3 r2ex 2652 . 2
4 elxpk 4196 . 2 k
52, 3, 43bitr4ri 269 1 k
 Colors of variables: wff setvar class Syntax hints:   wb 176   wa 358  wex 1541   wceq 1642   wcel 1710  wrex 2615  copk 4057   k cxpk 4174 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334  ax-nin 4078  ax-sn 4087 This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-ne 2518  df-rex 2620  df-v 2861  df-nin 3211  df-compl 3212  df-in 3213  df-un 3214  df-dif 3215  df-ss 3259  df-nul 3551  df-sn 3741  df-pr 3742  df-opk 4058  df-xpk 4185 This theorem is referenced by:  xpkeq1  4198  xpkeq2  4199
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