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Theorem xp01disj 6436
Description: Cartesian products with the singletons of ordinals 0 and 1 are disjoint. (Contributed by NM, 2-Jun-2007.)
Assertion
Ref Expression
xp01disj  |-  ( ( A  X.  { (/) } )  i^i  ( C  X.  { 1o }
) )  =  (/)

Proof of Theorem xp01disj
StepHypRef Expression
1 1n0 6435 . . 3  |-  1o  =/=  (/)
21necomi 2432 . 2  |-  (/)  =/=  1o
3 xpsndisj 5057 . 2  |-  ( (/)  =/=  1o  ->  ( ( A  X.  { (/) } )  i^i  ( C  X.  { 1o } ) )  =  (/) )
42, 3ax-mp 5 1  |-  ( ( A  X.  { (/) } )  i^i  ( C  X.  { 1o }
) )  =  (/)
Colors of variables: wff set class
Syntax hints:    = wceq 1353    =/= wne 2347    i^i cin 3130   (/)c0 3424   {csn 3594    X. cxp 4626   1oc1o 6412
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-in1 614  ax-in2 615  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-14 2151  ax-ext 2159  ax-sep 4123  ax-nul 4131  ax-pow 4176  ax-pr 4211
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ne 2348  df-ral 2460  df-rex 2461  df-v 2741  df-dif 3133  df-un 3135  df-in 3137  df-ss 3144  df-nul 3425  df-pw 3579  df-sn 3600  df-pr 3601  df-op 3603  df-br 4006  df-opab 4067  df-suc 4373  df-xp 4634  df-rel 4635  df-cnv 4636  df-1o 6419
This theorem is referenced by:  endisj  6826
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