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| Mirrors > Home > MPE Home > Th. List > xp01disjl | Structured version Visualization version GIF version | ||
| Description: Cartesian products with the singletons of ordinals 0 and 1 are disjoint. (Contributed by Jim Kingdon, 11-Jul-2023.) |
| Ref | Expression |
|---|---|
| xp01disjl | ⊢ (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1n0 8413 | . . 3 ⊢ 1o ≠ ∅ | |
| 2 | 1 | necomi 2984 | . 2 ⊢ ∅ ≠ 1o |
| 3 | disjsn2 4667 | . 2 ⊢ (∅ ≠ 1o → ({∅} ∩ {1o}) = ∅) | |
| 4 | xpdisj1 6117 | . 2 ⊢ (({∅} ∩ {1o}) = ∅ → (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅) | |
| 5 | 2, 3, 4 | mp2b 10 | 1 ⊢ (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1541 ≠ wne 2930 ∩ cin 3898 ∅c0 4283 {csn 4578 × cxp 5620 1oc1o 8388 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2706 ax-sep 5239 ax-nul 5249 ax-pr 5375 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2713 df-cleq 2726 df-clel 2809 df-ne 2931 df-ral 3050 df-rex 3059 df-rab 3398 df-v 3440 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4284 df-if 4478 df-sn 4579 df-pr 4581 df-op 4585 df-opab 5159 df-xp 5628 df-rel 5629 df-suc 6321 df-1o 8395 |
| This theorem is referenced by: undjudom 10076 endjudisj 10077 djuen 10078 dju1dif 10081 dju1p1e2 10082 djucomen 10086 djuassen 10087 xpdjuen 10088 mapdjuen 10089 djudom1 10091 infdju1 10098 bj-2upln1upl 37168 |
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