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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 3918 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) | |
| 2 | ne0i 4294 | . 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 2114 ≠ wne 2933 ∩ cin 3901 ∅c0 4286 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-v 3443 df-dif 3905 df-in 3909 df-nul 4287 |
| This theorem is referenced by: minel 4419 disji 5084 disjiun 5087 onnseq 8278 uniinqs 8738 en3lplem1 9525 cplem1 9805 fpwwe2lem11 10556 limsupgre 15408 cat1lem 18024 lmcls 23250 conncn 23374 iunconnlem 23375 conncompclo 23383 2ndcsep 23407 lfinpfin 23472 locfincmp 23474 txcls 23552 pthaus 23586 qtopeu 23664 trfbas2 23791 filss 23801 zfbas 23844 fmfnfm 23906 tsmsfbas 24076 restmetu 24518 qdensere 24717 reperflem 24767 reconnlem1 24775 metds0 24799 metnrmlem1a 24807 minveclem3b 25388 ovolicc2lem5 25482 taylfval 26326 wlk1walk 29716 wwlksm1edg 29958 disjif 32656 disjif2 32659 dfufd2lem 33632 subfacp1lem6 35381 erdszelem5 35391 pconnconn 35427 cvmseu 35472 neibastop2lem 36556 topdifinffinlem 37554 sstotbnd3 37979 brtrclfv2 44035 corcltrcl 44047 disjinfi 45503 |
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