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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 2988 | . 2 ⊢ ∅ ≠ 1o |
| 3 | disjsn2 4644 | . 2 ⊢ (∅ ≠ 1o → ({∅} ∩ {1o}) = ∅) | |
| 4 | xpdisj1 6112 | . 2 ⊢ (({∅} ∩ {1o}) = ∅ → (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅) | |
| 5 | 2, 3, 4 | mp2b 10 | 1 ⊢ (({∅} × 𝐴) ∩ ({1o} × 𝐶)) = ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1547 ≠ wne 2934 ∩ cin 3882 ∅c0 4261 {csn 4555 × cxp 5616 1oc1o 8388 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-ext 2711 ax-sep 5218 ax-nul 5228 ax-pr 5362 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-sb 2074 df-clab 2718 df-cleq 2731 df-clel 2814 df-ne 2935 df-ral 3054 df-rex 3064 df-rab 3392 df-v 3433 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4262 df-if 4455 df-sn 4556 df-pr 4558 df-op 4562 df-opab 5135 df-xp 5624 df-rel 5625 df-suc 6316 df-1o 8395 |
| This theorem is referenced by: undjudom 10081 endjudisj 10082 djuen 10083 dju1dif 10086 dju1p1e2 10087 djucomen 10091 djuassen 10092 xpdjuen 10093 mapdjuen 10094 djudom1 10096 infdju1 10103 bj-2upln1upl 37377 |
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