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Theorem xp01disjl 8421
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 8417 . . 3 1o ≠ ∅
21necomi 2987 . 2 ∅ ≠ 1o
3 disjsn2 4657 . 2 (∅ ≠ 1o → ({∅} ∩ {1o}) = ∅)
4 xpdisj1 6120 . 2 (({∅} ∩ {1o}) = ∅ → (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅)
52, 3, 4mp2b 10 1 (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅
Colors of variables: wff setvar class
Syntax hints:   = wceq 1542  wne 2933  cin 3889  c0 4274  {csn 4568   × cxp 5623  1oc1o 8392
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-ext 2709  ax-sep 5232  ax-nul 5242  ax-pr 5371
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-sb 2069  df-clab 2716  df-cleq 2729  df-clel 2812  df-ne 2934  df-ral 3053  df-rex 3063  df-rab 3391  df-v 3432  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-sn 4569  df-pr 4571  df-op 4575  df-opab 5149  df-xp 5631  df-rel 5632  df-suc 6324  df-1o 8399
This theorem is referenced by:  undjudom  10084  endjudisj  10085  djuen  10086  dju1dif  10089  dju1p1e2  10090  djucomen  10094  djuassen  10095  xpdjuen  10096  mapdjuen  10097  djudom1  10099  infdju1  10106  bj-2upln1upl  37350
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