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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 8472 | . . 3 ⊢ 1o ≠ ∅ | |
| 2 | 1 | necomi 3018 | . 2 ⊢ ∅ ≠ 1o |
| 3 | disjsn2 4683 | . 2 ⊢ (∅ ≠ 1o → ({∅} ∩ {1o}) = ∅) | |
| 4 | xpdisj1 6159 | . 2 ⊢ (({∅} ∩ {1o}) = ∅ → (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅) | |
| 5 | 2, 3, 4 | mp2b 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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