| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 6595 | . . 3 ⊢ 1o ≠ ∅ | |
| 2 | 1 | necomi 2485 | . 2 ⊢ ∅ ≠ 1o |
| 3 | disjsn2 3730 | . 2 ⊢ (∅ ≠ 1o → ({∅} ∩ {1o}) = ∅) | |
| 4 | xpdisj1 5159 | . 2 ⊢ (({∅} ∩ {1o}) = ∅ → (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅) | |
| 5 | 2, 3, 4 | mp2b 8 | 1 ⊢ (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅ |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1395 ≠ wne 2400 ∩ cin 3197 ∅c0 3492 {csn 3667 × cxp 4721 1oc1o 6570 |
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-14 2203 ax-ext 2211 ax-sep 4205 ax-nul 4213 ax-pow 4262 ax-pr 4297 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-ral 2513 df-rex 2514 df-v 2802 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-nul 3493 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-opab 4149 df-suc 4466 df-xp 4729 df-rel 4730 df-1o 6577 |
| This theorem is referenced by: djucomen 7421 djuassen 7422 xpdjuen 7423 |
| Copyright terms: Public domain | W3C validator |