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Theorem xp01disjl 8477
Description: Cartesian products with the singletons of ordinals 0 and 1 are disjoint. (Contributed by Jim Kingdon, 11-Jul-2023.)
Assertion
Ref Expression
xp01disjl (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅

Proof of Theorem xp01disjl
StepHypRef Expression
1 1n0 8472 . . 3 1o ≠ ∅
21necomi 3018 . 2 ∅ ≠ 1o
3 disjsn2 4683 . 2 (∅ ≠ 1o → ({∅} ∩ {1o}) = ∅)
4 xpdisj1 6159 . 2 (({∅} ∩ {1o}) = ∅ → (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅)
52, 3, 4mp2b 10 1 (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅
Colors of variables: wff setvar class
Syntax hints:   = wceq 1567  wne 2964  cin 3912  c0 4294  {csn 4594   × cxp 5660  1oc1o 8446
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-ext 2741  ax-sep 5261  ax-nul 5271  ax-pr 5405
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-sb 2098  df-clab 2748  df-cleq 2761  df-clel 2844  df-ne 2965  df-ral 3086  df-rex 3096  df-rab 3424  df-v 3465  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4493  df-sn 4595  df-pr 4597  df-op 4601  df-opab 5178  df-xp 5668  df-rel 5669  df-suc 6367  df-1o 8453
This theorem is referenced by:  undjudom  10151  endjudisj  10152  djuen  10153  dju1dif  10156  dju1p1e2  10157  djucomen  10161  djuassen  10162  xpdjuen  10163  mapdjuen  10164  djudom1  10166  infdju1  10173  bj-2upln1upl  37548
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