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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 3901 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) | |
| 2 | ne0i 4272 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) | |
| 3 | 1, 2 | sylbir 237 | 1 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 397 ∈ wcel 2121 ≠ wne 2936 ∩ cin 3884 ∅c0 4264 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-ext 2713 |
| This theorem depends on definitions: df-bi 209 df-an 398 df-tru 1551 df-fal 1561 df-ex 1788 df-sb 2075 df-clab 2720 df-cleq 2733 df-clel 2816 df-ne 2937 df-v 3435 df-dif 3888 df-in 3892 df-nul 4265 |
| This theorem is referenced by: minel 4397 disji 5060 disjiun 5063 onnseq 8278 uniinqs 8738 en3lplem1 9528 cplem1 9808 fpwwe2lem11 10559 limsupgre 15438 cat1lem 18058 lmcls 23289 conncn 23413 iunconnlem 23414 conncompclo 23422 2ndcsep 23446 lfinpfin 23511 locfincmp 23513 txcls 23591 pthaus 23625 qtopeu 23703 trfbas2 23830 filss 23840 zfbas 23883 fmfnfm 23945 tsmsfbas 24115 restmetu 24557 qdensere 24756 reperflem 24806 reconnlem1 24814 metds0 24838 metnrmlem1a 24846 minveclem3b 25417 ovolicc2lem5 25510 taylfval 26346 wlk1walk 29729 wwlksm1edg 29971 disjif 32671 disjif2 32674 dfufd2lem 33644 subfacp1lem6 35428 erdszelem5 35438 pconnconn 35474 cvmseu 35519 neibastop2lem 36603 topdifinffinlem 37724 sstotbnd3 38158 brtrclfv2 44186 corcltrcl 44198 disjinfi 45653 |
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