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Theorem xp01disjl 6425
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 6423 . . 3 1o ≠ ∅
21necomi 2430 . 2 ∅ ≠ 1o
3 disjsn2 3652 . 2 (∅ ≠ 1o → ({∅} ∩ {1o}) = ∅)
4 xpdisj1 5045 . 2 (({∅} ∩ {1o}) = ∅ → (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅)
52, 3, 4mp2b 8 1 (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅
Colors of variables: wff set class
Syntax hints:   = wceq 1353  wne 2345  cin 3126  c0 3420  {csn 3589   × cxp 4618  1oc1o 6400
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 1445  ax-7 1446  ax-gen 1447  ax-ie1 1491  ax-ie2 1492  ax-8 1502  ax-10 1503  ax-11 1504  ax-i12 1505  ax-bndl 1507  ax-4 1508  ax-17 1524  ax-i9 1528  ax-ial 1532  ax-i5r 1533  ax-14 2149  ax-ext 2157  ax-sep 4116  ax-nul 4124  ax-pow 4169  ax-pr 4203
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1459  df-sb 1761  df-clab 2162  df-cleq 2168  df-clel 2171  df-nfc 2306  df-ne 2346  df-ral 2458  df-rex 2459  df-v 2737  df-dif 3129  df-un 3131  df-in 3133  df-ss 3140  df-nul 3421  df-pw 3574  df-sn 3595  df-pr 3596  df-op 3598  df-opab 4060  df-suc 4365  df-xp 4626  df-rel 4627  df-1o 6407
This theorem is referenced by:  djucomen  7205  djuassen  7206  xpdjuen  7207
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