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| Mirrors > Home > MPE Home > Th. List > inelcm | Structured version Visualization version GIF version | ||
| Description: The intersection of classes with a common member is nonempty. (Contributed by NM, 7-Apr-1994.) |
| Ref | Expression |
|---|---|
| inelcm | ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elin 3915 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) | |
| 2 | ne0i 4291 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) | |
| 3 | 1, 2 | sylbir 235 | 1 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2113 ≠ wne 2930 ∩ cin 3898 ∅c0 4283 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2706 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2713 df-cleq 2726 df-clel 2809 df-ne 2931 df-v 3440 df-dif 3902 df-in 3906 df-nul 4284 |
| This theorem is referenced by: minel 4416 disji 5081 disjiun 5084 onnseq 8274 uniinqs 8732 en3lplem1 9519 cplem1 9799 fpwwe2lem11 10550 limsupgre 15402 cat1lem 18018 lmcls 23244 conncn 23368 iunconnlem 23369 conncompclo 23377 2ndcsep 23401 lfinpfin 23466 locfincmp 23468 txcls 23546 pthaus 23580 qtopeu 23658 trfbas2 23785 filss 23795 zfbas 23838 fmfnfm 23900 tsmsfbas 24070 restmetu 24512 qdensere 24711 reperflem 24761 reconnlem1 24769 metds0 24793 metnrmlem1a 24801 minveclem3b 25382 ovolicc2lem5 25476 taylfval 26320 wlk1walk 29661 wwlksm1edg 29903 disjif 32602 disjif2 32605 dfufd2lem 33579 subfacp1lem6 35328 erdszelem5 35338 pconnconn 35374 cvmseu 35419 neibastop2lem 36503 topdifinffinlem 37491 sstotbnd3 37916 brtrclfv2 43910 corcltrcl 43922 disjinfi 45378 |
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