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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 8102 | . . 3 ⊢ 1o ≠ ∅ | |
2 | 1 | necomi 3041 | . 2 ⊢ ∅ ≠ 1o |
3 | disjsn2 4608 | . 2 ⊢ (∅ ≠ 1o → ({∅} ∩ {1o}) = ∅) | |
4 | xpdisj1 5985 | . 2 ⊢ (({∅} ∩ {1o}) = ∅ → (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅) | |
5 | 2, 3, 4 | mp2b 10 | 1 ⊢ (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅ |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1538 ≠ wne 2987 ∩ cin 3880 ∅c0 4243 {csn 4525 × cxp 5517 1oc1o 8078 |
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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pr 5295 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-ral 3111 df-rab 3115 df-v 3443 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-sn 4526 df-pr 4528 df-op 4532 df-opab 5093 df-xp 5525 df-rel 5526 df-suc 6165 df-1o 8085 |
This theorem is referenced by: undjudom 9578 endjudisj 9579 djuen 9580 dju1dif 9583 dju1p1e2 9584 djucomen 9588 djuassen 9589 xpdjuen 9590 mapdjuen 9591 djudom1 9593 infdju1 9600 bj-2upln1upl 34460 |
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