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Theorem 0xp 4363
Description: The cross product with the empty set is empty. Part of Theorem 3.13(ii) of [Monk1] p. 37. (Contributed by NM, 4-Jul-1994.)
Assertion
Ref Expression
0xp  (/)  X.  (/)

Proof of Theorem 0xp
Dummy variables are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 elxp 4305 . . 3  (/)  X.  <. ,  >.  (/)
2 noel 3222 . . . . . . 7  (/)
3 simprl 483 . . . . . . 7  <. ,  >.  (/)  (/)
42, 3mto 587 . . . . . 6  <. ,  >.  (/)
54nex 1386 . . . . 5  <. ,  >.  (/)
65nex 1386 . . . 4  <. , 
>.  (/)
7 noel 3222 . . . 4  (/)
86, 72false 616 . . 3  <. , 
>.  (/)  (/)
91, 8bitri 173 . 2  (/)  X.  (/)
109eqriv 2034 1  (/)  X.  (/)
Colors of variables: wff set class
Syntax hints:   wa 97   wceq 1242  wex 1378   wcel 1390   (/)c0 3218   <.cop 3370    X. cxp 4286
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in1 544  ax-in2 545  ax-io 629  ax-5 1333  ax-7 1334  ax-gen 1335  ax-ie1 1379  ax-ie2 1380  ax-8 1392  ax-10 1393  ax-11 1394  ax-i12 1395  ax-bnd 1396  ax-4 1397  ax-14 1402  ax-17 1416  ax-i9 1420  ax-ial 1424  ax-i5r 1425  ax-ext 2019  ax-sep 3866  ax-pow 3918  ax-pr 3935
This theorem depends on definitions:  df-bi 110  df-3an 886  df-tru 1245  df-fal 1248  df-nf 1347  df-sb 1643  df-clab 2024  df-cleq 2030  df-clel 2033  df-nfc 2164  df-v 2553  df-dif 2914  df-un 2916  df-in 2918  df-ss 2925  df-nul 3219  df-pw 3353  df-sn 3373  df-pr 3374  df-op 3376  df-opab 3810  df-xp 4294
This theorem is referenced by:  res0  4559  xp0  4686  xpeq0r  4689  xpdisj1  4690  xpima1  4710
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