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Theorem dfxp3 6409
 Description: Define the cross product of three classes. Compare df-xp 4887. (Contributed by FL, 6-Nov-2013.) (Proof shortened by Mario Carneiro, 3-Nov-2015.)
Assertion
Ref Expression
dfxp3
Distinct variable groups:   ,,,   ,,,   ,,,

Proof of Theorem dfxp3
Dummy variable is distinct from all other variables.
StepHypRef Expression
1 biidd 230 . . 3
21dfoprab4 6407 . 2
3 df-xp 4887 . 2
4 df-3an 939 . . 3
54oprabbii 6132 . 2
62, 3, 53eqtr4i 2468 1
 Colors of variables: wff set class Syntax hints:   wa 360   w3a 937   wceq 1653   wcel 1726  cop 3819  copab 4268   cxp 4879  coprab 6085 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1556  ax-5 1567  ax-17 1627  ax-9 1667  ax-8 1688  ax-13 1728  ax-14 1730  ax-6 1745  ax-7 1750  ax-11 1762  ax-12 1951  ax-ext 2419  ax-sep 4333  ax-nul 4341  ax-pow 4380  ax-pr 4406  ax-un 4704 This theorem depends on definitions:  df-bi 179  df-or 361  df-an 362  df-3an 939  df-tru 1329  df-ex 1552  df-nf 1555  df-sb 1660  df-eu 2287  df-mo 2288  df-clab 2425  df-cleq 2431  df-clel 2434  df-nfc 2563  df-ne 2603  df-ral 2712  df-rex 2713  df-rab 2716  df-v 2960  df-sbc 3164  df-dif 3325  df-un 3327  df-in 3329  df-ss 3336  df-nul 3631  df-if 3742  df-sn 3822  df-pr 3823  df-op 3825  df-uni 4018  df-br 4216  df-opab 4270  df-mpt 4271  df-id 4501  df-xp 4887  df-rel 4888  df-cnv 4889  df-co 4890  df-dm 4891  df-rn 4892  df-iota 5421  df-fun 5459  df-fv 5465  df-oprab 6088  df-1st 6352  df-2nd 6353
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