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Mirrors > Home > ILE Home > Th. List > xp01disjl | 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 6337 | . . 3 ⊢ 1o ≠ ∅ | |
2 | 1 | necomi 2394 | . 2 ⊢ ∅ ≠ 1o |
3 | disjsn2 3594 | . 2 ⊢ (∅ ≠ 1o → ({∅} ∩ {1o}) = ∅) | |
4 | xpdisj1 4971 | . 2 ⊢ (({∅} ∩ {1o}) = ∅ → (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅) | |
5 | 2, 3, 4 | mp2b 8 | 1 ⊢ (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅ |
Colors of variables: wff set class |
Syntax hints: = wceq 1332 ≠ wne 2309 ∩ cin 3075 ∅c0 3368 {csn 3532 × cxp 4545 1oc1o 6314 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-nul 4062 ax-pow 4106 ax-pr 4139 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1335 df-fal 1338 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ne 2310 df-ral 2422 df-rex 2423 df-v 2691 df-dif 3078 df-un 3080 df-in 3082 df-ss 3089 df-nul 3369 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-opab 3998 df-suc 4301 df-xp 4553 df-rel 4554 df-1o 6321 |
This theorem is referenced by: djucomen 7089 djuassen 7090 xpdjuen 7091 |
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